path: root/doc/quagga.info

This is quagga.info, produced by makeinfo version 4.8 from quagga.texi.

   Copyright (C) 1999-2005 Kunihiro Ishiguro, et al.

     Permission is granted to make and distribute verbatim copies of
     this manual provided the copyright notice and this permission
     notice are preserved on all copies.

     Permission is granted to copy and distribute modified versions of
     this manual under the conditions for verbatim copying, provided
     that the entire resulting derived work is distributed under the
     terms of a permission notice identical to this one.

     Permission is granted to copy and distribute translations of this
     manual into another language, under the above conditions for
     modified versions, except that this permission notice may be
     stated in a translation approved by Kunihiro Ishiguro.

INFO-DIR-SECTION Routing Software:
START-INFO-DIR-ENTRY
* Quagga: (quagga).		The Quagga Software Routing Suite
END-INFO-DIR-ENTRY

   This file documents the Quagga Software Routing Suite which manages
common TCP/IP routing protocols.

   This is Edition 0.99.4, last updated 10 September 2005 of `The
Quagga Manual', for Quagga Version 0.99.4.

   Copyright (C) 1999-2005 Kunihiro Ishiguro, et al.

     Permission is granted to make and distribute verbatim copies of
     this manual provided the copyright notice and this permission
     notice are preserved on all copies.

     Permission is granted to copy and distribute modified versions of
     this manual under the conditions for verbatim copying, provided
     that the entire resulting derived work is distributed under the
     terms of a permission notice identical to this one.

     Permission is granted to copy and distribute translations of this
     manual into another language, under the above conditions for
     modified versions, except that this permission notice may be
     stated in a translation approved by Kunihiro Ishiguro.


File: quagga.info,  Node: Top,  Next: Overview,  Up: (dir)

Quagga
******

Quagga is an advanced routing software package that provides a suite of
TCP/IP based routing protocols.  This is the Manual for Quagga 0.99.4.
Quagga is a fork of GNU Zebra.

   Copyright (C) 1999-2005 Kunihiro Ishiguro, et al.

     Permission is granted to make and distribute verbatim copies of
     this manual provided the copyright notice and this permission
     notice are preserved on all copies.

     Permission is granted to copy and distribute modified versions of
     this manual under the conditions for verbatim copying, provided
     that the entire resulting derived work is distributed under the
     terms of a permission notice identical to this one.

     Permission is granted to copy and distribute translations of this
     manual into another language, under the above conditions for
     modified versions, except that this permission notice may be
     stated in a translation approved by Kunihiro Ishiguro.

* Menu:

* Overview::
* Installation::
* Basic commands::
* Zebra::
* RIP::
* RIPng::
* OSPFv2::
* OSPFv3::
* BGP::
* Configuring Quagga as a Route Server::
* VTY shell::
* Filtering::
* Route Map::
* IPv6 Support::
* Kernel Interface::
* SNMP Support::
* Zebra Protocol::
* Packet Binary Dump Format::
* Command Index::
* VTY Key Index::
   

File: quagga.info,  Node: Overview,  Next: Installation,  Prev: Top,  Up: Top

1 Overview
**********

Quagga is a routing software package that provides TCP/IP based routing
services with routing protocols support such as RIPv1, RIPv2, RIPng,
OSPFv2, OSPFv3, BGP-4, and BGP-4+ (*note Supported RFC::). Quagga also
supports special BGP Route Reflector and Route Server behavior.  In
addition to traditional IPv4 routing protocols, Quagga also supports
IPv6 routing protocols.  With SNMP daemon which supports SMUX protocol,
Quagga provides routing protocol MIBs (*note SNMP Support::).

   Quagga uses an advanced software architecture to provide you with a
high quality, multi server routing engine. Quagga has an interactive
user interface for each routing protocol and supports common client
commands.  Due to this design, you can add new protocol daemons to
Quagga easily.  You can use Quagga library as your program's client
user interface.

   Quagga is distributed under the GNU General Public License.

* Menu:

* About Quagga::                Basic information about Quagga
* System Architecture::         The Quagga system architecture
* Supported Platforms::         Supported platforms and future plans
* Supported RFC::               Supported RFCs
* How to get Quagga::
* Mailing List::                Mailing list information
* Bug Reports::                 Mail address for bug data


File: quagga.info,  Node: About Quagga,  Next: System Architecture,  Up: Overview

1.1 About Quagga
================

Today, TCP/IP networks are covering all of the world.  The Internet has
been deployed in many countries, companies, and to the home.  When you
connect to the Internet your packet will pass many routers which have
TCP/IP routing functionality.

   A system with Quagga installed acts as a dedicated router.  With
Quagga, your machine exchanges routing information with other routers
using routing protocols.  Quagga uses this information to update the
kernel routing table so that the right data goes to the right place.
You can dynamically change the configuration and you may view routing
table information from the Quagga terminal interface.

   Adding to routing protocol support, Quagga can setup interface's
flags, interface's address, static routes and so on.  If you have a
small network, or a stub network, or xDSL connection, configuring the
Quagga routing software is very easy.  The only thing you have to do is
to set up the interfaces and put a few commands about static routes
and/or default routes.  If the network is rather large, or if the
network structure changes frequently, you will want to take advantage
of Quagga's dynamic routing protocol support for protocols such as RIP,
OSPF or BGP.

   Traditionally, UNIX based router configuration is done by `ifconfig'
and `route' commands.  Status of routing table is displayed by
`netstat' utility.  Almost of these commands work only if the user has
root privileges.  Quagga has a different system administration method.
There are two user modes in Quagga.  One is normal mode, the other is
enable mode.  Normal mode user can only view system status, enable mode
user can change system configuration.  This UNIX account independent
feature will be great help to the router administrator.

   Currently, Quagga supports common unicast routing protocols.
Multicast routing protocols such as BGMP, PIM-SM, PIM-DM may be
supported in Quagga 2.0.  MPLS support is going on.  In the future,
TCP/IP filtering control, QoS control, diffserv configuration will be
added to Quagga. Quagga project's final goal is making a productive,
quality, free TCP/IP routing software.


File: quagga.info,  Node: System Architecture,  Next: Supported Platforms,  Prev: About Quagga,  Up: Overview

1.2 System Architecture
=======================

Traditional routing software is made as a one process program which
provides all of the routing protocol functionalities.  Quagga takes a
different approach.  It is made from a collection of several daemons
that work together to build the routing table.  There may be several
protocol-specific routing daemons and zebra the kernel routing manager.

   The `ripd' daemon handles the RIP protocol, while `ospfd' is a
daemon which supports OSPF version 2.  `bgpd' supports the BGP-4
protocol.  For changing the kernel routing table and for redistribution
of routes between different routing protocols, there is a kernel
routing table manager `zebra' daemon.  It is easy to add a new routing
protocol daemons to the entire routing system without affecting any
other software.  You need to run only the protocol daemon associated
with routing protocols in use.  Thus, user may run a specific daemon
and send routing reports to a central routing console.

   There is no need for these daemons to be running on the same
machine. You can even run several same protocol daemons on the same
machine.  This architecture creates new possibilities for the routing
system.

     +----+  +----+  +-----+  +-----+
     |bgpd|  |ripd|  |ospfd|  |zebra|
     +----+  +----+  +-----+  +-----+
                                 |
     +---------------------------|--+
     |                           v  |
     |  UNIX Kernel  routing table  |
     |                              |
     +------------------------------+

         Quagga System Architecture

   Multi-process architecture brings extensibility, modularity and
maintainability.  At the same time it also brings many configuration
files and terminal interfaces.  Each daemon has it's own configuration
file and terminal interface.  When you configure a static route, it
must be done in `zebra' configuration file.  When you configure BGP
network it must be done in `bgpd' configuration file.  This can be a
very annoying thing.  To resolve the problem, Quagga provides
integrated user interface shell called `vtysh'.  `vtysh' connects to
each daemon with UNIX domain socket and then works as a proxy for user
input.

   Quagga was planned to use multi-threaded mechanism when it runs with
a kernel that supports multi-threads.  But at the moment, the thread
library which comes with GNU/Linux or FreeBSD has some problems with
running reliable services such as routing software, so we don't use
threads at all.  Instead we use the `select(2)' system call for
multiplexing the events.


File: quagga.info,  Node: Supported Platforms,  Next: Supported RFC,  Prev: System Architecture,  Up: Overview

1.3 Supported Platforms
=======================

Currently Quagga supports GNU/Linux, BSD and Solaris. Porting Quagga to
other platforms is not too difficult as platform dependent code should
most be limited to the `zebra' daemon.  Protocol daemons are mostly
platform independent. Please let us know when you find out Quagga runs
on a platform which is not listed below.

   The list of officially supported platforms are listed below. Note
that Quagga may run correctly on other platforms, and may run with
partial functionality on further platforms.


   * GNU/Linux 2.2.x and higher

   * FreeBSD 4.x and higher

   * NetBSD 1.6 and higher

   * OpenBSD 2.5 and higher

   * Solaris 2.6 and higher (IPv6 support requires a patch at moment)


   Some IPv6 stacks are in development.  Quagga supports following IPv6
stacks.  For BSD, we recommend KAME IPv6 stack.  Solaris IPv6 stack is
not yet supported.

   * Linux IPv6 stack for GNU/Linux 2.2.x and higher.

   * KAME IPv6 stack for BSD.

   * INRIA IPv6 stack for BSD.


File: quagga.info,  Node: Supported RFC,  Next: How to get Quagga,  Prev: Supported Platforms,  Up: Overview

1.4 Supported RFC
=================

Below is the list of currently supported RFC's.

RFC1058
     `Routing Information Protocol. C.L. Hedrick. Jun-01-1988.'

RF2082
     `RIP-2 MD5 Authentication. F. Baker, R. Atkinson. January 1997.'

RFC2453
     `RIP Version 2. G. Malkin. November 1998.'

RFC2080
     `RIPng for IPv6. G. Malkin, R. Minnear. January 1997.'

RFC2328
     `OSPF Version 2. J. Moy. April 1998.'

RFC2370
     `The OSPF Opaque LSA Option R. Coltun. July 1998.'

RFC3101
     `The OSPF Not-So-Stubby Area (NSSA) Option P. Murphy. January
     2003.'

RFC2740
     `OSPF for IPv6. R. Coltun, D. Ferguson, J. Moy. December 1999.'

RFC1771
     `A Border Gateway Protocol 4 (BGP-4). Y. Rekhter & T. Li. March
     1995.'

RFC1965
     `Autonomous System Confederations for BGP. P. Traina. June 1996.'

RFC1997
     `BGP Communities Attribute. R. Chandra, P. Traina & T. Li. August
     1996.'

RFC2545
     `Use of BGP-4 Multiprotocol Extensions for IPv6 Inter-Domain
     Routing. P. Marques, F. Dupont. March 1999.'

RFC2796
     `BGP Route Reflection An alternative to full mesh IBGP. T. Bates &
     R. Chandrasekeran. June 1996.'

RFC2858
     `Multiprotocol Extensions for BGP-4. T. Bates, Y. Rekhter, R.
     Chandra, D. Katz. June 2000.'

RFC2842
     `Capabilities Advertisement with BGP-4. R. Chandra, J. Scudder.
     May 2000.'

RFC3137
     `OSPF Stub Router Advertisement, A. Retana, L. Nguyen, R. White,
     A. Zinin, D. McPherson. June 2001'

   When SNMP support is enabled, below RFC is also supported.

RFC1227
     `SNMP MUX protocol and MIB. M.T. Rose. May-01-1991.'

RFC1657
     `Definitions of Managed Objects for the Fourth Version of the
     Border Gateway Protocol (BGP-4) using SMIv2. S. Willis, J. Burruss,
     J. Chu, Editor. July 1994.'

RFC1724
     `RIP Version 2 MIB Extension. G. Malkin & F. Baker. November 1994.'

RFC1850
     `OSPF Version 2 Management Information Base. F. Baker, R. Coltun.
     November 1995.'



File: quagga.info,  Node: How to get Quagga,  Next: Mailing List,  Prev: Supported RFC,  Up: Overview

1.5 How to get Quagga
=====================

Quagga is still beta software and there is no officially released
version.

   Zebra's official web page is located at:

   `http://www.gnu.org/software/zebra/zebra.html'.

   The original Zebra web site is located at:

   `http://www.zebra.org/'.

   As of this writing, development by zebra.org on Zebra has slowed
down. Some work is being done by third-parties to try maintain
bug-fixes and enhancements to the current Zebra code-base, which has
resulted in a fork of Zebra called Quagga, see:

   `http://www.quagga.net/'

   for further information, as well as links to additional zebra
resources.


File: quagga.info,  Node: Mailing List,  Next: Bug Reports,  Prev: How to get Quagga,  Up: Overview

1.6 Mailing List
================

There is a mailing list for discussions about Quagga.  If you have any
comments or suggestions to Quagga, please subscribe to:

   `http://lists.quagga.net/mailman/listinfo/quagga-users'.

   The Quagga site has further information on the available mailing
lists, see:

   	`http://www.quagga.net/lists.php'


File: quagga.info,  Node: Bug Reports,  Prev: Mailing List,  Up: Overview

1.7 Bug Reports
===============

If you think you have found a bug, please send a bug report to:

   `http://bugzilla.quagga.net'

   When you send a bug report, please be careful about the points below.

   * Please note what kind of OS you are using.  If you use the IPv6
     stack please note that as well.

   * Please show us the results of `netstat -rn' and `ifconfig -a'.
     Information from zebra's VTY command `show ip route' will also be
     helpful.

   * Please send your configuration file with the report.  If you
     specify arguments to the configure script please note that too.

   Bug reports are very important for us to improve the quality of
Quagga.  Quagga is still in the development stage, but please don't
hesitate to send a bug report to `http://bugzilla.quagga.net'.


File: quagga.info,  Node: Installation,  Next: Basic commands,  Prev: Overview,  Up: Top

2 Installation
**************

There are three steps for installing the software: configuration,
compilation, and installation.

* Menu:

* Configure the Software::
* Build the Software::
* Install the Software::

   The easiest way to get Quagga running is to issue the following
commands:

     % configure
     % make
     % make install


File: quagga.info,  Node: Configure the Software,  Next: Build the Software,  Up: Installation

2.1 Configure the Software
==========================

* Menu:

* The Configure script and its options::
* Least-Privilege support::
* Linux notes::


File: quagga.info,  Node: The Configure script and its options,  Next: Least-Privilege support,  Up: Configure the Software

2.1.1 The Configure script and its options
------------------------------------------

Quagga has an excellent configure script which automatically detects
most host configurations.  There are several additional configure
options you can use to turn off IPv6 support, to disable the
compilation of specific daemons, and to enable SNMP support.

`--enable-guile'
     Turn on compilation of the zebra-guile interpreter.  You will need
     the guile library to make this.  zebra-guile implementation is not
     yet finished.  So this option is only useful for zebra-guile
     developers.

`--disable-ipv6'
     Turn off IPv6 related features and daemons.  Quagga configure
     script automatically detects IPv6 stack.  But sometimes you might
     want to disable IPv6 support of Quagga.

`--disable-zebra'
     Do not build zebra daemon.

`--disable-ripd'
     Do not build ripd.

`--disable-ripngd'
     Do not build ripngd.

`--disable-ospfd'
     Do not build ospfd.

`--disable-ospf6d'
     Do not build ospf6d.

`--disable-bgpd'
     Do not build bgpd.

`--disable-bgp-announce'
     Make `bgpd' which does not make bgp announcements at all.  This
     feature is good for using `bgpd' as a BGP announcement listener.

`--enable-netlink'
     Force to enable GNU/Linux netlink interface.  Quagga configure
     script detects netlink interface by checking a header file.  When
     the header file does not match to the current running kernel,
     configure script will not turn on netlink support.

`--enable-snmp'
     Enable SNMP support.  By default, SNMP support is disabled.

`--enable-opaque-lsa'
     Enable support for Opaque LSAs (RFC2370) in ospfd.

`--disable-ospfapi'
     Disable support for OSPF-API, an API to interface directly with
     ospfd.  OSPF-API is enabled if -enable-opaque-lsa is set.

`--disable-ospfclient'
     Disable building of the example OSPF-API client.

`--enable-ospf-te'
     Enable support for OSPF Traffic Engineering Extension
     (internet-draft) this requires support for Opaque LSAs.

`--enable-multipath=ARG'
     Enable support for Equal Cost Multipath. ARG is the maximum number
     of ECMP paths to allow, set to 0 to allow unlimited number of
     paths.

`--enable-rtadv'
     Enable support IPV6 router advertisement in zebra.

   You may specify any combination of the above options to the configure
script.  By default, the executables are placed in `/usr/local/sbin'
and the configuration files in `/usr/local/etc'. The `/usr/local/'
installation prefix and other directories may be changed using the
following options to the configuration script.

`--prefix=PREFIX'
     Install architecture-independent files in PREFIX [/usr/local].

`--sysconfdir=DIR'
     Look for configuration files in DIR [PREFIX/etc]. Note that sample
     configuration files will be installed here.

`--localstatedir=DIR'
     Configure zebra to use DIR for local state files, such as pid
     files and unix sockets.

     % ./configure --disable-ipv6

   This command will configure zebra and the routing daemons.


File: quagga.info,  Node: Least-Privilege support,  Next: Linux notes,  Prev: The Configure script and its options,  Up: Configure the Software

2.1.2 Least-Privilege support
-----------------------------

Additionally, you may configure zebra to drop its elevated privileges
shortly after startup and switch to another user. The configure script
will automatically try to configure this support. There are three
configure options to control the behaviour of Quagga daemons.

`--enable-user=USER'
     Switch to user ARG shortly after startup, and run as user ARG in
     normal operation.

`--enable-group=GROUP'
     Switch real and effective group to GROUP shortly after startup.

`--enable-vty-group=GROUP'
     Create Unix Vty sockets (for use with vtysh) with group owndership
     set to GROUP. This allows one to create a seperate group which is
     restricted to accessing only the Vty sockets, hence allowing one to
     delegate this group to individual users, or to run vtysh setgid to
     this group.

   The default user and group which will be configured is 'quagga' if
no user or group is specified. Note that this user or group requires
write access to the local state directory (see -localstatedir) and
requires at least read access, and write access if you wish to allow
daemons to write out their configuration, to the configuration
directory (see -sysconfdir).

   On systems which have the 'libcap' capabilities manipulation library
(currently only linux), the quagga system will retain only minimal
capabilities required, further it will only raise these capabilities for
brief periods. On systems without libcap, quagga will run as the user
specified and only raise its uid back to uid 0 for brief periods.


File: quagga.info,  Node: Linux notes,  Prev: Least-Privilege support,  Up: Configure the Software

2.1.3 Linux Notes
-----------------

There are several options available only to GNU/Linux systems: (1).  If
you use GNU/Linux, make sure that the current kernel configuration is
what you want.  Quagga will run with any kernel configuration but some
recommendations do exist.

CONFIG_NETLINK
     Kernel/User netlink socket. This is a brand new feature which
     enables an advanced interface between the Linux kernel and zebra
     (*note Kernel Interface::).

CONFIG_RTNETLINK
     Routing messages.  This makes it possible to receive netlink
     routing messages.  If you specify this option, `zebra' can detect
     routing information updates directly from the kernel (*note Kernel
     Interface::).

CONFIG_IP_MULTICAST
     IP: multicasting.  This option should be specified when you use
     `ripd' (*note RIP::) or `ospfd' (*note OSPFv2::) because these
     protocols use multicast.


   IPv6 support has been added in GNU/Linux kernel version 2.2.  If you
try to use the Quagga IPv6 feature on a GNU/Linux kernel, please make
sure the following libraries have been installed.  Please note that
these libraries will not be needed when you uses GNU C library 2.1 or
upper.

`inet6-apps'
     The `inet6-apps' package includes basic IPv6 related libraries such
     as `inet_ntop' and `inet_pton'.  Some basic IPv6 programs such as
     `ping', `ftp', and `inetd' are also included. The `inet-apps' can
     be found at `ftp://ftp.inner.net/pub/ipv6/'.

`net-tools'
     The `net-tools' package provides an IPv6 enabled interface and
     routing utility.  It contains `ifconfig', `route', `netstat', and
     other tools.  `net-tools' may be found at
     `http://www.tazenda.demon.co.uk/phil/net-tools/'.


   ---------- Footnotes ----------

   (1) GNU/Linux has very flexible kernel configuration features


File: quagga.info,  Node: Build the Software,  Next: Install the Software,  Prev: Configure the Software,  Up: Installation

2.2 Build the Software
======================

After configuring the software, you will need to compile it for your
system. Simply issue the command `make' in the root of the source
directory and the software will be compiled. If you have *any* problems
at this stage, be certain to send a bug report *Note Bug Reports::.

     % ./configure
     .
     .
     .
     ./configure output
     .
     .
     .
     % make


File: quagga.info,  Node: Install the Software,  Prev: Build the Software,  Up: Installation

2.3 Install the Software
========================

Installing the software to your system consists of copying the compiled
programs and supporting files to a standard location. After the
installation process has completed, these files have been copied from
your work directory to `/usr/local/bin', and `/usr/local/etc'.

   To install the Quagga suite, issue the following command at your
shell prompt: `make install'.

     %
     % make install
     %

   Quagga daemons have their own terminal interface or VTY.  After
installation, you have to setup each beast's port number to connect to
them.  Please add the following entries to `/etc/services'.

     zebrasrv      2600/tcp		  # zebra service
     zebra         2601/tcp		  # zebra vty
     ripd          2602/tcp		  # RIPd vty
     ripngd        2603/tcp		  # RIPngd vty
     ospfd         2604/tcp		  # OSPFd vty
     bgpd          2605/tcp		  # BGPd vty
     ospf6d        2606/tcp		  # OSPF6d vty
     ospfapi       2607/tcp		  # ospfapi
     isisd         2608/tcp		  # ISISd vty

   If you use a FreeBSD newer than 2.2.8, the above entries are already
added to `/etc/services' so there is no need to add it. If you specify
a port number when starting the daemon, these entries may not be needed.

   You may need to make changes to the config files in
`/etc/quagga/*.conf'. *Note Config Commands::.


File: quagga.info,  Node: Basic commands,  Next: Zebra,  Prev: Installation,  Up: Top

3 Basic commands
****************

There are five routing daemons in use, and there is one manager daemon.
These daemons may be located on separate machines from the manager
daemon.  Each of these daemons will listen on a particular port for
incoming VTY connections.  The routing daemons are:

   * `ripd', `ripngd', `ospfd', `ospf6d', `bgpd'

   * `zebra'

   The following sections discuss commands common to all the routing
daemons.

* Menu:

* Terminal Mode Commands::      Common commands used in a VTY
* Config Commands::             Commands used in config files
* Common Invocation Options::   Starting the daemons
* Virtual Terminal Interfaces:: Interacting with the daemons


File: quagga.info,  Node: Config Commands,  Next: Common Invocation Options,  Prev: Terminal Mode Commands,  Up: Basic commands

3.1 Config Commands
===================

* Menu:

* Basic Config Commands::       Some of the generic config commands
* Sample Config File::          An example config file

   In a config file, you can write the debugging options, a vty's
password, routing daemon configurations, a log file name, and so forth.
This information forms the initial command set for a routing beast as
it is starting.

   Config files are generally found in:

     `/etc/quagga/*.conf'

   Each of the daemons has its own config file.  For example, zebra's
default config file name is:

     `/etc/quagga/zebra.conf'

   The daemon name plus `.conf' is the default config file name. You
can specify a config file using the `-f' or `--config-file' options
when starting the daemon.


File: quagga.info,  Node: Basic Config Commands,  Next: Sample Config File,  Up: Config Commands

3.1.1 Basic Config Commands
---------------------------

 -- Command: hostname HOSTNAME
     Set hostname of the router.

 -- Command: password PASSWORD
     Set password for vty interface.  If there is no password, a vty
     won't accept connections.

 -- Command: enable password PASSWORD
     Set enable password.

 -- Command: log trap LEVEL
 -- Command: no log trap
     These commands are deprecated and are present only for historical
     compatibility.  The log trap command sets the current logging
     level for all enabled logging destinations, and it sets the
     default for all future logging commands that do not specify a
     level.  The normal default logging level is debugging.  The `no'
     form of the command resets the default level for future logging
     commands to debugging, but it does not change the logging level of
     existing logging destinations.

 -- Command: log stdout
 -- Command: log stdout LEVEL
 -- Command: no log stdout
     Enable logging output to stdout.  If the optional second argument
     specifying the logging level is not present, the default logging
     level (typically debugging, but can be changed using the
     deprecated `log trap' command) will be used.  The `no' form of the
     command disables logging to stdout.  The `level' argument must
     have one of these values: emergencies, alerts, critical, errors,
     warnings, notifications, informational, or debugging.  Note that
     the existing code logs its most important messages with severity
     `errors'.

 -- Command: log file FILENAME
 -- Command: log file FILENAME LEVEL
 -- Command: no log file
     If you want to log into a file, please specify `filename' as in
     this example:
          log file /var/log/quagga/bgpd.log informational
     If the optional second argument specifying the logging level is
     not present, the default logging level (typically debugging, but
     can be changed using the deprecated `log trap' command) will be
     used.  The `no' form of the command disables logging to a file.

     Note: if you do not configure any file logging, and a daemon
     crashes due to a signal or an assertion failure, it will attempt
     to save the crash information in a file named
     /var/tmp/quagga.<daemon name>.crashlog.  For security reasons,
     this will not happen if the file exists already, so it is
     important to delete the file after reporting the crash information.

 -- Command: log syslog
 -- Command: log syslog LEVEL
 -- Command: no log syslog
     Enable logging output to syslog.  If the optional second argument
     specifying the logging level is not present, the default logging
     level (typically debugging, but can be changed using the
     deprecated `log trap' command) will be used.  The `no' form of the
     command disables logging to syslog.

 -- Command: log monitor
 -- Command: log monitor LEVEL
 -- Command: no log monitor
     Enable logging output to vty terminals that have enabled logging
     using the `terminal monitor' command.  By default, monitor logging
     is enabled at the debugging level, but this command (or the
     deprecated `log trap' command) can be used to change the monitor
     logging level.  If the optional second argument specifying the
     logging level is not present, the default logging level (typically
     debugging, but can be changed using the deprecated `log trap'
     command) will be used.  The `no' form of the command disables
     logging to terminal monitors.

 -- Command: log facility FACILITY
 -- Command: no log facility
     This command changes the facility used in syslog messages.  The
     default facility is `daemon'.  The `no' form of the command resets
     the facility to the default `daemon' facility.

 -- Command: log record-priority
 -- Command: no log record-priority
     To include the severity in all messages logged to a file, to
     stdout, or to a terminal monitor (i.e. anything except syslog),
     use the `log record-priority' global configuration command.  To
     disable this option, use the `no' form of the command.  By default,
     the severity level is not included in logged messages.  Note: some
     versions of syslogd (including Solaris) can be configured to
     include the facility and level in the messages emitted.

 -- Command: service password-encryption
     Encrypt password.

 -- Command: service advanced-vty
     Enable advanced mode VTY.

 -- Command: service terminal-length <0-512>
     Set system wide line configuration.  This configuration command
     applies to all VTY interfaces.

 -- Command: line vty
     Enter vty configuration mode.

 -- Command: banner motd default
     Set default motd string.

 -- Command: no banner motd
     No motd banner string will be printed.

 -- Line Command: exec-timeout MINUTE
 -- Line Command: exec-timeout MINUTE SECOND
     Set VTY connection timeout value.  When only one argument is
     specified it is used for timeout value in minutes.  Optional
     second argument is used for timeout value in seconds. Default
     timeout value is 10 minutes.  When timeout value is zero, it means
     no timeout.

 -- Line Command: no exec-timeout
     Do not perform timeout at all.  This command is as same as
     `exec-timeout 0 0'.

 -- Line Command: access-class ACCESS-LIST
     Restrict vty connections with an access list.


File: quagga.info,  Node: Sample Config File,  Prev: Basic Config Commands,  Up: Config Commands

3.1.2 Sample Config File
------------------------

Below is a sample configuration file for the zebra daemon.

     !
     ! Zebra configuration file
     !
     hostname Router
     password zebra
     enable password zebra
     !
     log stdout
     !
     !

   '!' and '#' are comment characters.  If the first character of the
word is one of the comment characters then from the rest of the line
forward will be ignored as a comment.

     password zebra!password

   If a comment character is not the first character of the word, it's a
normal character. So in the above example '!' will not be regarded as a
comment and the password is set to 'zebra!password'.


File: quagga.info,  Node: Terminal Mode Commands,  Next: Config Commands,  Up: Basic commands

3.2 Terminal Mode Commands
==========================

 -- Command: write terminal
     Displays the current configuration to the vty interface.

 -- Command: write file
     Write current configuration to configuration file.

 -- Command: configure terminal
     Change to configuration mode.  This command is the first step to
     configuration.

 -- Command: terminal length <0-512>
     Set terminal display length to <0-512>.  If length is 0, no
     display control is performed.

 -- Command: who
     Show a list of currently connected vty sessions.

 -- Command: list
     List all available commands.

 -- Command: show version
     Show the current version of Quagga and its build host information.

 -- Command: show logging
     Shows the current configuration of the logging system.  This
     includes the status of all logging destinations.

 -- Command: logmsg LEVEL MESSAGE
     Send a message to all logging destinations that are enabled for
     messages of the given severity.


File: quagga.info,  Node: Common Invocation Options,  Next: Virtual Terminal Interfaces,  Prev: Config Commands,  Up: Basic commands

3.3 Common Invocation Options
=============================

These options apply to all Quagga daemons.

`-d'
`--daemon'
     Runs in daemon mode.

`-f FILE'
`--config_file=FILE'
     Set configuration file name.

`-h'
`--help'
     Display this help and exit.

`-i FILE'
`--pid_file=FILE'
     Upon startup the process identifier of the daemon is written to a
     file, typically in `/var/run'.  This file can be used by the init
     system to implement commands such as `.../init.d/zebra status',
     `.../init.d/zebra restart' or `.../init.d/zebra stop'.

     The file name is an run-time option rather than a configure-time
     option so that multiple routing daemons can be run simultaneously.
     This is useful when using Quagga to implement a routing looking
     glass.  One machine can be used to collect differing routing views
     from differing points in the network.

`-A ADDRESS'
`--vty_addr=ADDRESS'
     Set the VTY local address to bind to. If set, the VTY socket will
     only be bound to this address.

`-P PORT'
`--vty_port=PORT'
     Set the VTY TCP port number. If set to 0 then the TCP VTY sockets
     will not be opened.

`-u USER'
`--vty_addr=USER'
     Set the user and group to run as.

`-v'
`--version'
     Print program version.



File: quagga.info,  Node: Virtual Terminal Interfaces,  Prev: Common Invocation Options,  Up: Basic commands

3.4 Virtual Terminal Interfaces
===============================

VTY - Virtual Terminal [aka TeletYpe] Interface is a command line
interface (CLI) for user interaction with the routing daemon.

* Menu:

* VTY Overview::                Basics about VTYs
* VTY Modes::                   View, Enable, and Other VTY modes
* VTY CLI Commands::            Commands for movement, edition, and management


File: quagga.info,  Node: VTY Overview,  Next: VTY Modes,  Up: Virtual Terminal Interfaces

3.4.1 VTY Overview
------------------

VTY stands for Virtual TeletYpe interface.  It means you can connect to
the daemon via the telnet protocol.

   To enable a VTY interface, you have to setup a VTY password.  If
there is no VTY password, one cannot connect to the VTY interface at
all.

     % telnet localhost 2601
     Trying 127.0.0.1...
     Connected to localhost.
     Escape character is '^]'.

     Hello, this is Quagga (version 0.99.4)
     Copyright (C) 1999-2005 Kunihiro Ishiguro, et al.

     User Access Verification

     Password: XXXXX
     Router> ?
       enable            Turn on privileged commands
       exit              Exit current mode and down to previous mode
       help              Description of the interactive help system
       list              Print command list
       show              Show running system information
       who               Display who is on a vty
     Router> enable
     Password: XXXXX
     Router# configure terminal
     Router(config)# interface eth0
     Router(config-if)# ip address 10.0.0.1/8
     Router(config-if)# ^Z
     Router#

   '?' is very useful for looking up commands.


File: quagga.info,  Node: VTY Modes,  Next: VTY CLI Commands,  Prev: VTY Overview,  Up: Virtual Terminal Interfaces

3.4.2 VTY Modes
---------------

There are three basic VTY modes:

* Menu:

* VTY View Mode::               Mode for read-only interaction
* VTY Enable Mode::             Mode for read-write interaction
* VTY Other Modes::             Special modes (tftp, etc)

   There are commands that may be restricted to specific VTY modes.


File: quagga.info,  Node: VTY View Mode,  Next: VTY Enable Mode,  Up: VTY Modes

3.4.2.1 VTY View Mode
.....................

This mode is for read-only access to the CLI. One may exit the mode by
leaving the system, or by entering `enable' mode.


File: quagga.info,  Node: VTY Enable Mode,  Next: VTY Other Modes,  Prev: VTY View Mode,  Up: VTY Modes

3.4.2.2 VTY Enable Mode
.......................

This mode is for read-write access to the CLI. One may exit the mode by
leaving the system, or by escaping to view mode.


File: quagga.info,  Node: VTY Other Modes,  Prev: VTY Enable Mode,  Up: VTY Modes

3.4.2.3 VTY Other Modes
.......................

This page is for describing other modes.


File: quagga.info,  Node: VTY CLI Commands,  Prev: VTY Modes,  Up: Virtual Terminal Interfaces

3.4.3 VTY CLI Commands
----------------------

Commands that you may use at the command-line are described in the
following three subsubsections.

* Menu:

* CLI Movement Commands::       Commands for moving the cursor about
* CLI Editing Commands::        Commands for changing text
* CLI Advanced Commands::       Other commands, session management and so on


File: quagga.info,  Node: CLI Movement Commands,  Next: CLI Editing Commands,  Up: VTY CLI Commands

3.4.3.1 CLI Movement Commands
.............................

These commands are used for moving the CLI cursor. The <C> character
means press the Control Key.

`C-f'
`<RIGHT>'
     Move forward one character.

`C-b'
`<LEFT>'
     Move backward one character.

`M-f'
     Move forward one word.

`M-b'
     Move backward one word.

`C-a'
     Move to the beginning of the line.

`C-e'
     Move to the end of the line.



File: quagga.info,  Node: CLI Editing Commands,  Next: CLI Advanced Commands,  Prev: CLI Movement Commands,  Up: VTY CLI Commands

3.4.3.2 CLI Editing Commands
............................

These commands are used for editing text on a line. The <C> character
means press the Control Key.

`C-h'
`<DEL>'
     Delete the character before point.

`C-d'
     Delete the character after point.

`M-d'
     Forward kill word.

`C-w'
     Backward kill word.

`C-k'
     Kill to the end of the line.

`C-u'
     Kill line from the beginning, erasing input.

`C-t'
     Transpose character.



File: quagga.info,  Node: CLI Advanced Commands,  Prev: CLI Editing Commands,  Up: VTY CLI Commands

3.4.3.3 CLI Advanced Commands
.............................

There are several additional CLI commands for command line completions,
insta-help, and VTY session management.

`C-c'
     Interrupt current input and moves to the next line.

`C-z'
     End current configuration session and move to top node.

`C-n'
`<DOWN>'
     Move down to next line in the history buffer.

`C-p'
`<UP>'
     Move up to previous line in the history buffer.

`TAB'
     Use command line completion by typing <TAB>.

`'
     You can use command line help by typing `help' at the beginning of
     the line.  Typing `?' at any point in the line will show possible
     completions.



File: quagga.info,  Node: Zebra,  Next: RIP,  Prev: Basic commands,  Up: Top

4 Zebra
*******

`zebra' is an IP routing manager.  It provides kernel routing table
updates, interface lookups, and redistribution of routes between
different routing protocols.

* Menu:

* Invoking zebra::              Running the program
* Interface Commands::          Commands for zebra interfaces
* Static Route Commands::       Commands for adding static routes
* zebra Terminal Mode Commands::  Commands for zebra's VTY


File: quagga.info,  Node: Invoking zebra,  Next: Interface Commands,  Up: Zebra

4.1 Invoking zebra
==================

Besides the common invocation options (*note Common Invocation
Options::), the `zebra' specific invocation options are listed below.

`-b'
`--batch'
     Runs in batch mode.  `zebra' parses configuration file and
     terminates immediately.

`-k'
`--keep_kernel'
     When zebra starts up, don't delete old self inserted routes.

`-r'
`--retain'
     When program terminates, retain routes added by zebra.



File: quagga.info,  Node: Interface Commands,  Next: Static Route Commands,  Prev: Invoking zebra,  Up: Zebra

4.2 Interface Commands
======================

 -- Command: interface IFNAME

 -- Interface Command: shutdown
 -- Interface Command: no shutdown
     Up or down the current interface.

 -- Interface Command: ip address ADDRESS/PREFIX
 -- Interface Command: ip6 address ADDRESS/PREFIX
 -- Interface Command: no ip address ADDRESS/PREFIX
 -- Interface Command: no ip6 address ADDRESS/PREFIX
     Set the IPv4 or IPv6 address/prefix for the interface.

 -- Interface Command: ip address ADDRESS/PREFIX secondary
 -- Interface Command: no ip address ADDRESS/PREFIX secondary
     Set the secondary flag for this address. This causes ospfd to not
     treat the address as a distinct subnet.

 -- Interface Command: description DESCRIPTION ...
     Set description for the interface.

 -- Interface Command: multicast
 -- Interface Command: no multicast
     Enable or disables multicast flag for the interface.

 -- Interface Command: bandwidth <1-10000000>
 -- Interface Command: no bandwidth <1-10000000>
     Set bandwidth value of the interface in kilobits/sec.  This is for
     calculating OSPF cost. This command does not affect the actual
     device configuration.

 -- Interface Command: link-detect
 -- Interface Command: no link-detect
     Enable/disable link-detect on platforms which support this.
     Currently only linux and with certain drivers - those which
     properly support the IFF_RUNNING flag.


File: quagga.info,  Node: Static Route Commands,  Next: zebra Terminal Mode Commands,  Prev: Interface Commands,  Up: Zebra

4.3 Static Route Commands
=========================

Static routing is a very fundamental feature of routing technology.  It
defines static prefix and gateway.

 -- Command: ip route NETWORK GATEWAY
     NETWORK is destination prefix with format of A.B.C.D/M.  GATEWAY
     is gateway for the prefix.  When GATEWAY is A.B.C.D format.  It is
     taken as a IPv4 address gateway.  Otherwise it is treated as an
     interface name. If the interface name is NULL0 then zebra installs
     a blackhole route.

          ip route 10.0.0.0/8 10.0.0.2
          ip route 10.0.0.0/8 ppp0
          ip route 10.0.0.0/8 null0

     First example defines 10.0.0.0/8 static route with gateway
     10.0.0.2.  Second one defines the same prefix but with gateway to
     interface ppp0. The third install a blackhole route.

 -- Command: ip route NETWORK NETMASK GATEWAY
     This is alternate version of above command.  When NETWORK is
     A.B.C.D format, user must define NETMASK value with A.B.C.D
     format.  GATEWAY is same option as above command

          ip route 10.0.0.0 255.255.255.0 10.0.0.2
          ip route 10.0.0.0 255.255.255.0 ppp0
          ip route 10.0.0.0 255.255.255.0 null0

     These statements are equivalent to those in the previous example.

 -- Command: ip route NETWORK GATEWAY DISTANCE
     Installs the route with the specified distance.

   Multiple nexthop static route

     ip route 10.0.0.1/32 10.0.0.2
     ip route 10.0.0.1/32 10.0.0.3
     ip route 10.0.0.1/32 eth0

   If there is no route to 10.0.0.2 and 10.0.0.3, and interface eth0 is
reachable, then the last route is installed into the kernel.

   If zebra has been compiled with multipath support, and both 10.0.0.2
and 10.0.0.3 are reachable, zebra will install a multipath route via
both nexthops, if the platform supports this.

     zebra> show ip route
     S>  10.0.0.1/32 [1/0] via 10.0.0.2 inactive
                           via 10.0.0.3 inactive
       *                   is directly connected, eth0

     ip route 10.0.0.0/8 10.0.0.2
     ip route 10.0.0.0/8 10.0.0.3
     ip route 10.0.0.0/8 null0 255

   This will install a multihop route via the specified next-hops if
they are reachable, as well as a high-metric blackhole route, which can
be useful to prevent traffic destined for a prefix to match
less-specific routes (eg default) should the specified gateways not be
reachable. Eg:

     zebra> show ip route 10.0.0.0/8
     Routing entry for 10.0.0.0/8
       Known via "static", distance 1, metric 0
         10.0.0.2 inactive
         10.0.0.3 inactive

     Routing entry for 10.0.0.0/8
       Known via "static", distance 255, metric 0
         directly connected, Null0

 -- Command: ipv6 route NETWORK GATEWAY
 -- Command: ipv6 route NETWORK GATEWAY DISTANCE
     These behave similarly to their ipv4 counterparts.

 -- Command: table TABLENO
     Select the primary kernel routing table to be used.  This only
     works for kernels supporting multiple routing tables (like
     GNU/Linux 2.2.x and later).  After setting TABLENO with this
     command, static routes defined after this are added to the
     specified table.


File: quagga.info,  Node: zebra Terminal Mode Commands,  Prev: Static Route Commands,  Up: Zebra

4.4 zebra Terminal Mode Commands
================================

 -- Command: show ip route
     Display current routes which zebra holds in its database.

          Router# show ip route
          Codes: K - kernel route, C - connected, S - static, R - RIP,
                 B - BGP * - FIB route.

          K* 0.0.0.0/0              203.181.89.241
          S  0.0.0.0/0              203.181.89.1
          C* 127.0.0.0/8            lo
          C* 203.181.89.240/28      eth0

 -- Command: show ipv6 route

 -- Command: show interface

 -- Command: show ipforward
     Display whether the host's IP forwarding function is enabled or
     not.  Almost any UNIX kernel can be configured with IP forwarding
     disabled.  If so, the box can't work as a router.

 -- Command: show ipv6forward
     Display whether the host's IP v6 forwarding is enabled or not.


File: quagga.info,  Node: RIP,  Next: RIPng,  Prev: Zebra,  Up: Top

5 RIP
*****

RIP - Routing Information Protocol is widely deployed interior gateway
protocol.  RIP was developed in the 1970s at Xerox Labs as part of the
XNS routing protocol.  RIP is a "distance-vector" protocol and is based
on the "Bellman-Ford" algorithms.  As a distance-vector protocol, RIP
router send updates to its neighbors periodically, thus allowing the
convergence to a known topology.  In each update, the distance to any
given network will be broadcasted to its neighboring router.

   `ripd' supports RIP version 2 as described in RFC2453 and RIP
version 1 as described in RFC1058.

* Menu:

* Starting and Stopping ripd::
* RIP Configuration::
* RIP Version Control::
* How to Announce RIP route::
* Filtering RIP Routes::
* RIP Metric Manipulation::
* RIP distance::
* RIP route-map::
* RIP Authentication::
* RIP Timers::
* Show RIP Information::
* RIP Debug Commands::


File: quagga.info,  Node: Starting and Stopping ripd,  Next: RIP Configuration,  Up: RIP

5.1 Starting and Stopping ripd
==============================

The default configuration file name of `ripd''s is `ripd.conf'.  When
invocation `ripd' searches directory /etc/quagga.  If `ripd.conf' is
not there next search current directory.

   RIP uses UDP port 520 to send and receive RIP packets.  So the user
must have the capability to bind the port, generally this means that
the user must have superuser privileges.  RIP protocol requires
interface information maintained by `zebra' daemon.  So running `zebra'
is mandatory to run `ripd'.  Thus minimum sequence for running RIP is
like below:

     # zebra -d
     # ripd -d

   Please note that `zebra' must be invoked before `ripd'.

   To stop `ripd'.  Please use `kill `cat /var/run/ripd.pid`'.  Certain
signals have special meaningss to `ripd'.

`SIGHUP'
     Reload configuration file `ripd.conf'.  All configurations are
     reseted.  All routes learned so far are cleared and removed from
     routing table.

`SIGUSR1'
     Rotate `ripd' logfile.

`SIGINT'
`SIGTERM'
     `ripd' sweeps all installed RIP routes then terminates properly.

   `ripd' invocation options.  Common options that can be specified
(*note Common Invocation Options::).

`-r'
`--retain'
     When the program terminates, retain routes added by `ripd'.

* Menu:

* RIP netmask::


File: quagga.info,  Node: RIP netmask,  Up: Starting and Stopping ripd

5.1.1 RIP netmask
-----------------

The netmask features of `ripd' support both version 1 and version 2 of
RIP.  Version 1 of RIP originally contained no netmask information.  In
RIP version 1, network classes were originally used to determine the
size of the netmask.  Class A networks use 8 bits of mask, Class B
networks use 16 bits of masks, while Class C networks use 24 bits of
mask.  Today, the most widely used method of a network mask is assigned
to the packet on the basis of the interface that received the packet.
Version 2 of RIP supports a variable length subnet mask (VLSM).  By
extending the subnet mask, the mask can be divided and reused.  Each
subnet can be used for different purposes such as large to middle size
LANs and WAN links.  Quagga `ripd' does not support the non-sequential
netmasks that are included in RIP Version 2.

   In a case of similar information with the same prefix and metric, the
old information will be suppressed.  Ripd does not currently support
equal cost multipath routing.


File: quagga.info,  Node: RIP Configuration,  Next: RIP Version Control,  Prev: Starting and Stopping ripd,  Up: RIP

5.2 RIP Configuration
=====================

 -- Command: router rip
     The `router rip' command is necessary to enable RIP.  To disable
     RIP, use the `no router rip' command.  RIP must be enabled before
     carrying out any of the RIP commands.

 -- Command: no router rip
     Disable RIP.

 -- RIP Command: network NETWORK
 -- RIP Command: no network NETWORK
     Set the RIP enable interface by NETWORK.  The interfaces which
     have addresses matching with NETWORK are enabled.

     This group of commands either enables or disables RIP interfaces
     between certain numbers of a specified network address.  For
     example, if the network for 10.0.0.0/24 is RIP enabled, this would
     result in all the addresses from 10.0.0.0 to 10.0.0.255 being
     enabled for RIP.  The `no network' command will disable RIP for
     the specified network.

 -- RIP Command: network IFNAME
 -- RIP Command: no network IFNAME
     Set a RIP enabled interface by IFNAME.  Both the sending and
     receiving of RIP packets will be enabled on the port specified in
     the `network ifname' command.  The `no network ifname' command
     will disable RIP on the specified interface.

 -- RIP Command: neighbor A.B.C.D
 -- RIP Command: no neighbor A.B.C.D
     Specify RIP neighbor.  When a neighbor doesn't understand
     multicast, this command is used to specify neighbors.  In some
     cases, not all routers will be able to understand multicasting,
     where packets are sent to a network or a group of addresses.  In a
     situation where a neighbor cannot process multicast packets, it is
     necessary to establish a direct link between routers.  The
     neighbor command allows the network administrator to specify a
     router as a RIP neighbor.  The `no neighbor a.b.c.d' command will
     disable the RIP neighbor.

   Below is very simple RIP configuration.  Interface `eth0' and
interface which address match to `10.0.0.0/8' are RIP enabled.

     !
     router rip
      network 10.0.0.0/8
      network eth0
     !

   Passive interface

 -- RIP command: passive-interface (IFNAME|default)
 -- RIP command: no passive-interface IFNAME
     This command sets the specified interface to passive mode.  On
     passive mode interface, all receiving packets are processed as
     normal and ripd does not send either multicast or unicast RIP
     packets except to RIP neighbors specified with `neighbor' command.
     The interface may be specified as DEFAULT to make ripd default to
     passive on all interfaces.

     The default is to be passive on all interfaces.

   RIP split-horizon

 -- Interface command: ip split-horizon
 -- Interface command: no ip split-horizon
     Control split-horizon on the interface.  Default is `ip
     split-horizon'.  If you don't perform split-horizon on the
     interface, please specify `no ip split-horizon'.


File: quagga.info,  Node: RIP Version Control,  Next: How to Announce RIP route,  Prev: RIP Configuration,  Up: RIP

5.3 RIP Version Control
=======================

RIP can be configured to send either Version 1 or Version 2 packets.
The default is to send RIPv2 while accepting both RIPv1 and RIPv2 (and
replying with packets of the appropriate version for REQUESTS /
triggered updates). The version to receive and send can be specified
globally, and further overriden on a per-interface basis if needs be
for send and receive seperately (see below).

   It is important to note that RIPv1 can not be authenticated. Further,
if RIPv1 is enabled then RIP will reply to REQUEST packets, sending the
state of its RIP routing table to any remote routers that ask on
demand. For a more detailed discussion on the security implications of
RIPv1 see *Note RIP Authentication::.

 -- RIP Command: version VERSION
     Set RIP version to accept for reads and send.  VERSION can be
     either `1" or `2".

     Disabling RIPv1 by specifying version 2 is STRONGLY encouraged,
     *Note RIP Authentication::. This may become the default in a future
     release.

     Default: Send Version 2, and accept either version.

 -- RIP Command: no version
     Reset the global version setting back to the default.

 -- Interface command: ip rip send version VERSION
     VERSION can be `1', `2' or `1 2'.

     This interface command overrides the global rip version setting,
     and selects which version of RIP to send packets with, for this
     interface specifically. Choice of RIP Version 1, RIP Version 2, or
     both versions.  In the latter case, where `1 2' is specified,
     packets will be both broadcast and multicast.

     Default: Send packets according to the global version (version 2)

 -- Interface command: ip rip receive version VERSION
     VERSION can be `1', `2' or `1 2'.

     This interface command overrides the global rip version setting,
     and selects which versions of RIP packets will be accepted on this
     interface. Choice of RIP Version 1, RIP Version 2, or both.

     Default: Accept packets according to the global setting (both 1
     and 2).


File: quagga.info,  Node: How to Announce RIP route,  Next: Filtering RIP Routes,  Prev: RIP Version Control,  Up: RIP

5.4 How to Announce RIP route
=============================

 -- RIP command: redistribute kernel
 -- RIP command: redistribute kernel metric <0-16>
 -- RIP command: redistribute kernel route-map ROUTE-MAP
 -- RIP command: no redistribute kernel
     `redistribute kernel' redistributes routing information from
     kernel route entries into the RIP tables. `no redistribute kernel'
     disables the routes.

 -- RIP command: redistribute static
 -- RIP command: redistribute static metric <0-16>
 -- RIP command: redistribute static route-map ROUTE-MAP
 -- RIP command: no redistribute static
     `redistribute static' redistributes routing information from
     static route entries into the RIP tables. `no redistribute static'
     disables the routes.

 -- RIP command: redistribute connected
 -- RIP command: redistribute connected metric <0-16>
 -- RIP command: redistribute connected route-map ROUTE-MAP
 -- RIP command: no redistribute connected
     Redistribute connected routes into the RIP tables.  `no
     redistribute connected' disables the connected routes in the RIP
     tables.  This command redistribute connected of the interface
     which RIP disabled.  The connected route on RIP enabled interface
     is announced by default.

 -- RIP command: redistribute ospf
 -- RIP command: redistribute ospf metric <0-16>
 -- RIP command: redistribute ospf route-map ROUTE-MAP
 -- RIP command: no redistribute ospf
     `redistribute ospf' redistributes routing information from ospf
     route entries into the RIP tables. `no redistribute ospf' disables
     the routes.

 -- RIP command: redistribute bgp
 -- RIP command: redistribute bgp metric <0-16>
 -- RIP command: redistribute bgp route-map ROUTE-MAP
 -- RIP command: no redistribute bgp
     `redistribute bgp' redistributes routing information from bgp
     route entries into the RIP tables. `no redistribute bgp' disables
     the routes.

   If you want to specify RIP only static routes:

 -- RIP command: default-information originate

 -- RIP command: route A.B.C.D/M
 -- RIP command: no route A.B.C.D/M
     This command is specific to Quagga.  The `route' command makes a
     static route only inside RIP. This command should be used only by
     advanced users who are particularly knowledgeable about the RIP
     protocol.  In most cases, we recommend creating a static route in
     Quagga and redistributing it in RIP using `redistribute static'.


File: quagga.info,  Node: Filtering RIP Routes,  Next: RIP Metric Manipulation,  Prev: How to Announce RIP route,  Up: RIP

5.5 Filtering RIP Routes
========================

RIP routes can be filtered by a distribute-list.

 -- Command: distribute-list ACCESS_LIST DIRECT IFNAME
     You can apply access lists to the interface with a
     `distribute-list' command.  ACCESS_LIST is the access list name.
     DIRECT is `in' or `out'.  If DIRECT is `in' the access list is
     applied to input packets.

     The `distribute-list' command can be used to filter the RIP path.
     `distribute-list' can apply access-lists to a chosen interface.
     First, one should specify the access-list.  Next, the name of the
     access-list is used in the distribute-list command.  For example,
     in the following configuration `eth0' will permit only the paths
     that match the route 10.0.0.0/8

          !
          router rip
           distribute-list private in eth0
          !
          access-list private permit 10 10.0.0.0/8
          access-list private deny any
          !

   `distribute-list' can be applied to both incoming and outgoing data.

 -- Command: distribute-list prefix PREFIX_LIST (in|out) IFNAME
     You can apply prefix lists to the interface with a
     `distribute-list' command.  PREFIX_LIST is the prefix list name.
     Next is the direction of `in' or `out'.  If DIRECT is `in' the
     access list is applied to input packets.


File: quagga.info,  Node: RIP Metric Manipulation,  Next: RIP distance,  Prev: Filtering RIP Routes,  Up: RIP

5.6 RIP Metric Manipulation
===========================

RIP metric is a value for distance for the network.  Usually `ripd'
increment the metric when the network information is received.
Redistributed routes' metric is set to 1.

 -- RIP command: default-metric <1-16>
 -- RIP command: no default-metric <1-16>
     This command modifies the default metric value for redistributed
     routes.  The default value is 1.  This command does not affect
     connected route even if it is redistributed by `redistribute
     connected'.  To modify connected route's metric value, please use
     `redistribute connected metric' or `route-map'.  `offset-list' also
     affects connected routes.

 -- RIP command: offset-list ACCESS-LIST (in|out)
 -- RIP command: offset-list ACCESS-LIST (in|out) IFNAME


File: quagga.info,  Node: RIP distance,  Next: RIP route-map,  Prev: RIP Metric Manipulation,  Up: RIP

5.7 RIP distance
================

Distance value is used in zebra daemon.  Default RIP distance is 120.

 -- RIP command: distance <1-255>
 -- RIP command: no distance <1-255>
     Set default RIP distance to specified value.

 -- RIP command: distance <1-255> A.B.C.D/M
 -- RIP command: no distance <1-255> A.B.C.D/M
     Set default RIP distance to specified value when the route's
     source IP address matches the specified prefix.

 -- RIP command: distance <1-255> A.B.C.D/M ACCESS-LIST
 -- RIP command: no distance <1-255> A.B.C.D/M ACCESS-LIST
     Set default RIP distance to specified value when the route's
     source IP address matches the specified prefix and the specified
     access-list.


File: quagga.info,  Node: RIP route-map,  Next: RIP Authentication,  Prev: RIP distance,  Up: RIP

5.8 RIP route-map
=================

Usage of `ripd''s route-map support.

   Optional argument route-map MAP_NAME can be added to each
`redistribute' statement.

     redistribute static [route-map MAP_NAME]
     redistribute connected [route-map MAP_NAME]
     .....

   Cisco applies route-map _before_ routes will exported to rip route
table.  In current Quagga's test implementation, `ripd' applies
route-map after routes are listed in the route table and before routes
will be announced to an interface (something like output filter). I
think it is not so clear, but it is draft and it may be changed at
future.

   Route-map statement (*note Route Map::) is needed to use route-map
functionality.

 -- Route Map: match interface WORD
     This command match to incoming interface.  Notation of this match
     is different from Cisco. Cisco uses a list of interfaces - NAME1
     NAME2 ... NAMEN.  Ripd allows only one name (maybe will change in
     the future).  Next - Cisco means interface which includes next-hop
     of routes (it is somewhat similar to "ip next-hop" statement).
     Ripd means interface where this route will be sent. This
     difference is because "next-hop" of same routes which sends to
     different interfaces must be different. Maybe it'd be better to
     made new matches - say "match interface-out NAME" or something
     like that.

 -- Route Map: match ip address WORD
 -- Route Map: match ip address prefix-list WORD
     Match if route destination is permitted by access-list.

 -- Route Map: match ip next-hop A.B.C.D
     Cisco uses here <access-list>, `ripd' IPv4 address. Match if route
     has this next-hop (meaning next-hop listed in the rip route table
     - "show ip rip")

 -- Route Map: match metric <0-4294967295>
     This command match to the metric value of RIP updates.  For other
     protocol compatibility metric range is shown as <0-4294967295>.
     But for RIP protocol only the value range <0-16> make sense.

 -- Route Map: set ip next-hop A.B.C.D
     This command set next hop value in RIPv2 protocol.  This command
     does not affect RIPv1 because there is no next hop field in the
     packet.

 -- Route Map: set metric <0-4294967295>
     Set a metric for matched route when sending announcement.  The
     metric value range is very large for compatibility with other
     protocols.  For RIP, valid metric values are from 1 to 16.


File: quagga.info,  Node: RIP Authentication,  Next: RIP Timers,  Prev: RIP route-map,  Up: RIP

5.9 RIP Authentication
======================

RIPv2 allows packets to be authenticated via either an insecure plain
text password, included with the packet, or via a more secure MD5 based
HMAC (keyed-Hashing for Message AuthentiCation), RIPv1 can not be
authenticated at all, thus when authentication is configured `ripd'
will discard routing updates received via RIPv1 packets.

   However, unless RIPv1 reception is disabled entirely, *Note RIP
Version Control::, RIPv1 REQUEST packets which are received, which
query the router for routing information, will still be honoured by
`ripd', and `ripd' WILL reply to such packets. This allows `ripd' to
honour such REQUESTs (which sometimes is used by old equipment and very
simple devices to bootstrap their default route), while still providing
security for route updates which are received.

   In short: Enabling authentication prevents routes being updated by
unauthenticated remote routers, but still can allow routes (I.e. the
entire RIP routing table) to be queried remotely, potentially by anyone
on the internet, via RIPv1.

   To prevent such unauthenticated querying of routes disable RIPv1,
*Note RIP Version Control::.

 -- Interface command: ip rip authentication mode md5
 -- Interface command: no ip rip authentication mode md5
     Set the interface with RIPv2 MD5 authentication.

 -- Interface command: ip rip authentication mode text
 -- Interface command: no ip rip authentication mode text
     Set the interface with RIPv2 simple password authentication.

 -- Interface command: ip rip authentication string STRING
 -- Interface command: no ip rip authentication string STRING
     RIP version 2 has simple text authentication.  This command sets
     authentication string.  The string must be shorter than 16
     characters.

 -- Interface command: ip rip authentication key-chain KEY-CHAIN
 -- Interface command: no ip rip authentication key-chain KEY-CHAIN
     Specifiy Keyed MD5 chain.

     !
     key chain test
      key 1
       key-string test
     !
     interface eth1
      ip rip authentication mode md5
      ip rip authentication key-chain test
     !


File: quagga.info,  Node: RIP Timers,  Next: Show RIP Information,  Prev: RIP Authentication,  Up: RIP

5.10 RIP Timers
===============

 -- RIP command: timers basic UPDATE TIMEOUT GARBAGE
     RIP protocol has several timers.  User can configure those timers'
     values by `timers basic' command.

     The default settings for the timers are as follows:

        * The update timer is 30 seconds. Every update timer seconds,
          the RIP process is awakened to send an unsolicited Response
          message containing the complete routing table to all
          neighboring RIP routers.

        * The timeout timer is 180 seconds. Upon expiration of the
          timeout, the route is no longer valid; however, it is
          retained in the routing table for a short time so that
          neighbors can be notified that the route has been dropped.

        * The garbage collect timer is 120 seconds.  Upon expiration of
          the garbage-collection timer, the route is finally removed
          from the routing table.


     The `timers basic' command allows the the default values of the
     timers listed above to be changed.

 -- RIP command: no timers basic
     The `no timers basic' command will reset the timers to the default
     settings listed above.


File: quagga.info,  Node: Show RIP Information,  Next: RIP Debug Commands,  Prev: RIP Timers,  Up: RIP

5.11 Show RIP Information
=========================

To display RIP routes.

 -- Command: show ip rip
     Show RIP routes.

   The command displays all RIP routes. For routes that are received
through RIP, this command will display the time the packet was sent and
the tag information.  This command will also display this information
for routes redistributed into RIP.

 -- Command: show ip protocols
     The command displays current RIP status.  It includes RIP timer,
     filtering, version, RIP enabled interface and RIP peer inforation.

     ripd> show ip protocols
     Routing Protocol is "rip"
       Sending updates every 30 seconds with +/-50%, next due in 35 seconds
       Timeout after 180 seconds, garbage collect after 120 seconds
       Outgoing update filter list for all interface is not set
       Incoming update filter list for all interface is not set
       Default redistribution metric is 1
       Redistributing: kernel connected
       Default version control: send version 2, receive version 2
         Interface        Send  Recv
       Routing for Networks:
         eth0
         eth1
         1.1.1.1
         203.181.89.241
       Routing Information Sources:
         Gateway          BadPackets BadRoutes  Distance Last Update


File: quagga.info,  Node: RIP Debug Commands,  Prev: Show RIP Information,  Up: RIP

5.12 RIP Debug Commands
=======================

Debug for RIP protocol.

 -- Command: debug rip events
     Debug rip events.

   `debug rip' will show RIP events.  Sending and receiving packets,
timers, and changes in interfaces are events shown with `ripd'.

 -- Command: debug rip packet
     Debug rip packet.

   `debug rip packet' will display detailed information about the RIP
packets.  The origin and port number of the packet as well as a packet
dump is shown.

 -- Command: debug rip zebra
     Debug rip between zebra communication.

   This command will show the communication between `ripd' and `zebra'.
The main information will include addition and deletion of paths to
the kernel and the sending and receiving of interface information.

 -- Command: show debugging rip
     Display `ripd''s debugging option.

   `show debugging rip' will show all information currently set for ripd
debug.


File: quagga.info,  Node: RIPng,  Next: OSPFv2,  Prev: RIP,  Up: Top

6 RIPng
*******

`ripngd' supports the RIPng protocol as described in RFC2080.  It's an
IPv6 reincarnation of the RIP protocol.

* Menu:

* Invoking ripngd::
* ripngd Configuration::
* ripngd Terminal Mode Commands::
* ripngd Filtering Commands::


File: quagga.info,  Node: Invoking ripngd,  Next: ripngd Configuration,  Up: RIPng

6.1 Invoking ripngd
===================

There are no `ripngd' specific invocation options.  Common options can
be specified (*note Common Invocation Options::).


File: quagga.info,  Node: ripngd Configuration,  Next: ripngd Terminal Mode Commands,  Prev: Invoking ripngd,  Up: RIPng

6.2 ripngd Configuration
========================

Currently ripngd supports the following commands:

 -- Command: router ripng
     Enable RIPng.

 -- RIPng Command: flush_timer TIME
     Set flush timer.

 -- RIPng Command: network NETWORK
     Set RIPng enabled interface by NETWORK

 -- RIPng Command: network IFNAME
     Set RIPng enabled interface by IFNAME

 -- RIPng Command: route NETWORK
     Set RIPng static routing announcement of NETWORK.

 -- Command: router zebra
     This command is the default and does not appear in the
     configuration.  With this statement, RIPng routes go to the
     `zebra' daemon.


File: quagga.info,  Node: ripngd Terminal Mode Commands,  Next: ripngd Filtering Commands,  Prev: ripngd Configuration,  Up: RIPng

6.3 ripngd Terminal Mode Commands
=================================

 -- Command: show ip ripng

 -- Command: show debugging ripng

 -- Command: debug ripng events

 -- Command: debug ripng packet

 -- Command: debug ripng zebra


File: quagga.info,  Node: ripngd Filtering Commands,  Prev: ripngd Terminal Mode Commands,  Up: RIPng

6.4 ripngd Filtering Commands
=============================

 -- Command: distribute-list ACCESS_LIST (in|out) IFNAME
     You can apply an access-list to the interface using the
     `distribute-list' command.  ACCESS_LIST is an access-list name.
     DIRECT is `in' or `out'.  If DIRECT is `in', the access-list is
     applied only to incoming packets.

          distribute-list local-only out sit1


File: quagga.info,  Node: OSPFv2,  Next: OSPFv3,  Prev: RIPng,  Up: Top

7 OSPFv2
********

OSPF (Open Shortest Path First) version 2 is a routing protocol which
is described in `RFC2328, OSPF Version 2'.  OSPF is an IGP (Interior
Gateway Protocol)..  Compared with RIP, OSPF can provide scalable
network support and faster convergence times.  OSPF is widely used in
large networks such as ISP (Internet Service Provider) backbone and
enterprise networks.

* Menu:

* Configuring ospfd::
* OSPF router::
* OSPF area::
* OSPF interface::
* Redistribute routes to OSPF::
* Showing OSPF information::
* Debugging OSPF::
* OSPF Configuration Examples::


File: quagga.info,  Node: Configuring ospfd,  Next: OSPF router,  Up: OSPFv2

7.1 Configuring ospfd
=====================

There are no `ospfd' specific options.  Common options can be specified
(*note Common Invocation Options::) to `ospfd'.  `ospfd' needs to
acquire interface information from `zebra' in order to function.
Therefore `zebra' must be running before invoking `ospfd'. Also, if
`zebra' is restarted then `ospfd' must be too.

   Like other daemons, `ospfd' configuration is done in OSPF specific
configuration file `ospfd.conf'.


File: quagga.info,  Node: OSPF router,  Next: OSPF area,  Prev: Configuring ospfd,  Up: OSPFv2

7.2 OSPF router
===============

To start OSPF process you have to specify the OSPF router.  As of this
writing, `ospfd' does not support multiple OSPF processes.

 -- Command: router ospf
 -- Command: no router ospf
     Enable or disable the OSPF process.  `ospfd' does not yet support
     multiple OSPF processes.  So you can not specify an OSPF process
     number.

 -- OSPF Command: ospf router-id A.B.C.D
 -- OSPF Command: no ospf router-id
     This sets the router-ID of the OSPF process. The router-ID may be
     an IP address of the router, but need not be - it can be any
     arbitrary 32bit number. However it MUST be unique within the
     entire OSPF domain to the OSPF speaker - bad things will happen if
     multiple OSPF speakers are configured with the same router-ID! If
     one is not specified then `ospfd' will obtain a router-ID
     automatically from `zebra'.

 -- OSPF Command: ospf abr-type TYPE
 -- OSPF Command: no ospf abr-type TYPE
     TYPE can be cisco|ibm|shortcut|standard.

     More information regarding the behaviour controlled by this
     command can be found in `RFC 3509, Alternative Implementations of
     OSPF Area Border Routers', and
     `draft-ietf-ospf-shortcut-abr-02.txt'.

     Quote: "Though the definition of the ABR (Area Border Router) in
     the OSPF specification does not require a router with multiple
     attached areas to have a backbone connection, it is actually
     necessary to provide successful routing to the inter-area and
     external destinations. If this requirement is not met, all traffic
     destined for the areas not connected to such an ABR or out of the
     OSPF domain, is dropped.  This document describes alternative ABR
     behaviors implemented in Cisco and IBM routers."

     The default ABR type is 'Cisco', allowing an ABR to consider
     summaries from non-backbone areas if, and only if, it has lost its
     link(s) to the backbone area.

 -- OSPF Command: ospf rfc1583compatibility
 -- OSPF Command: no ospf rfc1583compatibility
     This `RFC2328', the sucessor to `RFC1583', suggests according to
     section G.2 (changes) in section 16.4 a change to the path
     preference algorithm that prevents possible routing loops that were
     possible in the old version of OSPFv2. More specifically it demands
     that inter-area paths and intra-area path are now of equal
     preference but still both preferred to external paths.

     This command should NOT be set normally.

 -- OSPF Command: passive interface INTERFACE
 -- OSPF Command: no passive interface INTERFACE
     Do not speak OSPF interface on the given interface, but do
     advertise the interface as a stub link in the router-LSA (Link
     State Advertisement) for this router. This allows one to advertise
     addresses on such connected interfaces without having to originate
     AS-External/Type-5 LSAs (which have global flooding scope) - as
     would occur if connected addresses were redistributed into OSPF,
     *Note Redistribute routes to OSPF::.


 -- OSPF Command: timers throttle spf DELAY INITIAL-HOLDTIME
MAX-HOLDTIME
 -- OSPF Command: no timers throttle spf
     This command sets the initial DELAY, the INITIAL-HOLDTIME and the
     MAXIMUM-HOLDTIME between when SPF is calculated and the event
     which triggered the calculation. The times are specified in
     milliseconds and must be in the range of 0 to 600000 milliseconds.

     The DELAY specifies the minimum amount of time to delay SPF
     calculation (hence it affects how long SPF calculation is delayed
     after an event which occurs outside of the holdtime of any
     previous SPF calculation, and also serves as a minimum holdtime).

     Consecutive SPF calculations will always be seperated by at least
     'hold-time' milliseconds. The hold-time is adaptive and initially
     is set to the INITIAL-HOLDTIME configured with the above command.
     Events which occur within the holdtime of the previous SPF
     calculation will cause the holdtime to be increased by
     INITIAL-HOLDTIME, bounded by the MAXIMUM-HOLDTIME configured with
     this command. If the adaptive hold-time elapses without any
     SPF-triggering event occuring then the current holdtime is reset
     to the INITIAL-HOLDTIME. The current holdtime can be viewed with
     *Note show ip ospf::, where it is expressed as a multiplier of the
     INITIAL-HOLDTIME.

          router ospf
           timers throttle spf 200 400 10000

     In this example, the DELAY is set to 200ms, the INITIAL HOLDTIME
     is set to 400ms and the MAXIMUM HOLDTIME to 10s. Hence there will
     always be at least 200ms between an event which requires SPF
     calculation and the actual SPF calculation. Further consecutive SPF
     calculations will always be seperated by between 400ms to 10s, the
     hold-time increasing by 400ms each time an SPF-triggering event
     occurs within the hold-time of the previous SPF calculation.

     This command supercedes the `timers spf' command in previous Quagga
     releases.

 -- OSPF Command: max-metric router-lsa [on-startup|on-shutdown]
<5-86400>
 -- OSPF Command: max-metric router-lsa administrative
 -- OSPF Command: no max-metric router-lsa
[on-startup|on-shutdown|administrative]
     This enables `RFC3137, OSPF Stub Router Advertisement' support,
     where the OSPF process describes its transit links in its
     router-LSA as having infinite distance so that other routers will
     avoid calculating transit paths through the router while still
     being able to reach networks through the router.

     This support may be enabled administratively (and indefinitely) or
     conditionally. Conditional enabling of max-metric router-lsas can
     be for a period of seconds after startup and/or for a period of
     seconds prior to shutdown.

     Enabling this for a period after startup allows OSPF to converge
     fully first without affecting any existing routes used by other
     routers, while still allowing any connected stub links and/or
     redistributed routes to be reachable. Enabling this for a period
     of time in advance of shutdown allows the router to gracefully
     excuse itself from the OSPF domain.

     Enabling this feature administratively allows for administrative
     intervention for whatever reason, for an indefinite period of time.
     Note that if the configuration is written to file, this
     administrative form of the stub-router command will also be
     written to file. If `ospfd' is restarted later, the command will
     then take effect until manually deconfigured.

     Configured state of this feature as well as current status, such
     as the number of second remaining till on-startup or on-shutdown
     ends, can be viewed with the *Note show ip ospf:: command.

 -- OSPF Command: auto-cost reference-bandwidth <1-4294967>
 -- OSPF Command: no auto-cost reference-bandwidth
     This sets the reference bandwidth for cost calculations, where this
     bandwidth is considered equivalent to an OSPF cost of 1, specified
     in Mbits/s. The default is 100Mbit/s (i.e. a link of bandwidth
     100Mbit/s or higher will have a cost of 1. Cost of lower bandwidth
     links will be scaled with reference to this cost).

     This configuration setting MUST be consistent across all routers
     within the OSPF domain.

 -- OSPF Command: network A.B.C.D/M area A.B.C.D
 -- OSPF Command: network A.B.C.D/M area <0-4294967295>
 -- OSPF Command: no network A.B.C.D/M area A.B.C.D
 -- OSPF Command: no network A.B.C.D/M area <0-4294967295>
     This command specifies the OSPF enabled interface(s).  If the
     interface has an address from range 192.168.1.0/24 then the
     command below enables ospf on this interface so router can provide
     network information to the other ospf routers via this interface.

          router ospf
           network 192.168.1.0/24 area 0.0.0.0

     Prefix length in interface must be equal or bigger (ie. smaller
     network) than prefix length in network statement. For example
     statement above doesn't enable ospf on interface with address
     192.168.1.1/23, but it does on interface with address
     192.168.1.129/25.


File: quagga.info,  Node: OSPF area,  Next: OSPF interface,  Prev: OSPF router,  Up: OSPFv2

7.3 OSPF area
=============

 -- OSPF Command: area A.B.C.D range A.B.C.D/M
 -- OSPF Command: area <0-4294967295> range A.B.C.D/M
 -- OSPF Command: no area A.B.C.D range A.B.C.D/M
 -- OSPF Command: no area <0-4294967295> range A.B.C.D/M
     Summarize intra area paths from specified area into one Type-3
     summary-LSA announced to other areas. This command can be used
     only in ABR and ONLY router-LSAs (Type-1) and network-LSAs
     (Type-2) (ie. LSAs with scope area) can be summarized. Type-5
     AS-external-LSAs can't be summarized - their scope is AS.
     Summarizing Type-7 AS-external-LSAs isn't supported yet by Quagga.

          router ospf
           network 192.168.1.0/24 area 0.0.0.0
           network 10.0.0.0/8 area 0.0.0.10
           area 0.0.0.10 range 10.0.0.0/8

     With configuration above one Type-3 Summary-LSA with routing info
     10.0.0.0/8 is announced into backbone area if area 0.0.0.10
     contains at least one intra-area network (ie. described with
     router or network LSA) from this range.

 -- OSPF Command: area A.B.C.D range IPV4_PREFIX not-advertise
 -- OSPF Command: no area A.B.C.D range IPV4_PREFIX not-advertise
     Instead of summarizing intra area paths filter them - ie. intra
     area paths from this range are not advertised into other areas.
     This command makes sense in ABR only.

 -- OSPF Command: area A.B.C.D range IPV4_PREFIX substitute IPV4_PREFIX
 -- OSPF Command: no area A.B.C.D range IPV4_PREFIX substitute
IPV4_PREFIX
     Substitute summarized prefix with another prefix.

          router ospf
           network 192.168.1.0/24 area 0.0.0.0
           network 10.0.0.0/8 area 0.0.0.10
           area 0.0.0.10 range 10.0.0.0/8 substitute 11.0.0.0/8

     One Type-3 summary-LSA with routing info 11.0.0.0/8 is announced
     into backbone area if area 0.0.0.10 contains at least one
     intra-area network (ie. described with router-LSA or network-LSA)
     from range 10.0.0.0/8.  This command makes sense in ABR only.

 -- OSPF Command: area A.B.C.D virtual-link A.B.C.D
 -- OSPF Command: area <0-4294967295> virtual-link A.B.C.D
 -- OSPF Command: no area A.B.C.D virtual-link A.B.C.D
 -- OSPF Command: no area <0-4294967295> virtual-link A.B.C.D

 -- OSPF Command: area A.B.C.D shortcut
 -- OSPF Command: area <0-4294967295> shortcut
 -- OSPF Command: no area A.B.C.D shortcut
 -- OSPF Command: no area <0-4294967295> shortcut
     Configure th area as Shortcut capable. See `RFC3509'. This requires
     that the 'abr-type' be set to 'shortcut'.

 -- OSPF Command: area A.B.C.D stub
 -- OSPF Command: area <0-4294967295> stub
 -- OSPF Command: no area A.B.C.D stub
 -- OSPF Command: no area <0-4294967295> stub
     Configure the area to be a stub area. That is, an area where no
     router originates routes external to OSPF and hence an area where
     all external routes are via the ABR(s). Hence, ABRs for such an
     area do not need to pass AS-External LSAs (type-5s) or
     ASBR-Summary LSAs (type-4) into the area. They need only pass
     Network-Summary (type-3) LSAs into such an area, just a default
     summary.

 -- OSPF Command: area A.B.C.D stub no-summary
 -- OSPF Command: area <0-4294967295> stub no-summary
 -- OSPF Command: no area A.B.C.D stub no-summary
 -- OSPF Command: no area <0-4294967295> stub no-summary
     Prevents an `ospfd' ABR from injecting inter-area summaries into
     the specified stub area.

 -- OSPF Command: area A.B.C.D default-cost <0-16777215>
 -- OSPF Command: no area A.B.C.D default-cost <0-16777215>
     Set the cost of default-summary LSAs announced to stubby areas.

 -- OSPF Command: area A.B.C.D export-list NAME
 -- OSPF Command: area <0-4294967295> export-list NAME
 -- OSPF Command: no area A.B.C.D export-list NAME
 -- OSPF Command: no area <0-4294967295> export-list NAME
     Filter Type-3 summary-LSAs announced to other areas originated
     from intra- area paths from specified area.

          router ospf
           network 192.168.1.0/24 area 0.0.0.0
           network 10.0.0.0/8 area 0.0.0.10
           area 0.0.0.10 export-list foo
          !
          access-list foo permit 10.10.0.0/16
          access-list foo deny any

     With example above any intra-area paths from area 0.0.0.10 and
     from range 10.10.0.0/16 (for example 10.10.1.0/24 and
     10.10.2.128/30) are announced into other areas as Type-3
     summary-LSA's, but any others (for example 10.11.0.0/16 or
     10.128.30.16/30) aren't.

     This command is only relevant if the router is an ABR for the
     specified area.

 -- OSPF Command: area A.B.C.D import-list NAME
 -- OSPF Command: area <0-4294967295> import-list NAME
 -- OSPF Command: no area A.B.C.D import-list NAME
 -- OSPF Command: no area <0-4294967295> import-list NAME
     Same as export-list, but it applies to paths announced into
     specified area as Type-3 summary-LSAs.

 -- OSPF Command: area A.B.C.D filter-list prefix NAME in
 -- OSPF Command: area A.B.C.D filter-list prefix NAME out
 -- OSPF Command: area <0-4294967295> filter-list prefix NAME in
 -- OSPF Command: area <0-4294967295> filter-list prefix NAME out
 -- OSPF Command: no area A.B.C.D filter-list prefix NAME in
 -- OSPF Command: no area A.B.C.D filter-list prefix NAME out
 -- OSPF Command: no area <0-4294967295> filter-list prefix NAME in
 -- OSPF Command: no area <0-4294967295> filter-list prefix NAME out
     Filtering Type-3 summary-LSAs to/from area using prefix lists.
     This command makes sense in ABR only.

 -- OSPF Command: area A.B.C.D authentication
 -- OSPF Command: area <0-4294967295> authentication
 -- OSPF Command: no area A.B.C.D authentication
 -- OSPF Command: no area <0-4294967295> authentication
     Specify that simple password authentication should be used for the
     given area.

 -- OSPF Command: area A.B.C.D authentication message-digest
 -- OSPF Command: area <0-4294967295> authentication message-digest
     Specify that OSPF packets should be authenticated with MD5 HMACs
     for the given area.


File: quagga.info,  Node: OSPF interface,  Next: Redistribute routes to OSPF,  Prev: OSPF area,  Up: OSPFv2

7.4 OSPF interface
==================

 -- Interface Command: ip ospf authentication-key AUTH_KEY
 -- Interface Command: no ip ospf authentication-key
     Set OSPF authentication key to a simple password.  After setting
     AUTH_KEY, all OSPF packets are authenticated. AUTH_KEY has length
     up to 8 chars.

 -- Interface Command: ip ospf message-digest-key KEYID md5 KEY
 -- Interface Command: no ip ospf message-digest-key
     Set OSPF authentication key to a cryptographic password.  The
     cryptographic algorithm is MD5.  KEYID identifies secret key used
     to create the message digest.  KEY is the actual message digest
     key up to 16 chars.

     Note that OSPF MD5 authentication requires that time never go
     backwards (correct time is NOT important, only that it never goes
     backwards), even across resets, if ospfd is to be able to promptly
     reestabish adjacencies with its neighbours after restarts/reboots.
     The host should have system time be set at boot from an external
     source (eg battery backed clock, NTP, etc.) or else the system
     clock should be periodically saved to non-volative storage and
     restored at boot if MD5 authentication is to be expected to work
     reliably.

 -- Interface Command: ip ospf cost <1-65535>
 -- Interface Command: no ip ospf cost
     Set link cost for the specified interface.  The cost value is set
     to router-LSA's metric field and used for SPF calculation.

 -- Interface Command: ip ospf dead-interval <1-65535>
 -- Interface Command: ip ospf dead-interval minimal hello-multiplier
<2-20>
 -- Interface Command: no ip ospf dead-interval
     Set number of seconds for RouterDeadInterval timer value used for
     Wait Timer and Inactivity Timer.  This value must be the same for
     all routers attached to a common network.  The default value is 40
     seconds.

     If 'minimal' is specified instead, then the dead-interval is set
     to 1 second and one must specify a hello-multiplier. The
     hello-multiplier specifies how many Hellos to send per second,
     from 2 (every 500ms) to 20 (every 50ms). Thus one can have 1s
     convergence time for OSPF. If this form is specified, then the
     hello-interval advertised in Hello packets is set to 0 and the
     hello-interval on received Hello packets is not checked, thus the
     hello-multiplier need NOT be the same across multiple routers on a
     common link.

 -- Interface Command: ip ospf hello-interval <1-65535>
 -- Interface Command: no ip ospf hello-interval
     Set number of seconds for HelloInterval timer value.  Setting this
     value, Hello packet will be sent every timer value seconds on the
     specified interface.  This value must be the same for all routers
     attached to a common network.  The default value is 10 seconds.

     This command has no effect if *Note ip ospf dead-interval
     minimal:: is also specified for the interface.

 -- Interface Command: ip ospf network
(broadcast|non-broadcast|point-to-multipoint|point-to-point)
 -- Interface Command: no ip ospf network
     Set explicitly network type for specifed interface.

 -- Interface Command: ip ospf priority <0-255>
 -- Interface Command: no ip ospf priority
     Set RouterPriority integer value.  Setting higher value, router
     will be more eligible to become Designated Router.  Setting the
     value to 0, router is no longer eligible to Designated Router.
     The default value is 1.

 -- Interface Command: ip ospf retransmit-interval <1-65535>
 -- Interface Command: no ip ospf retransmit interval
     Set number of seconds for RxmtInterval timer value.  This value is
     used when retransmitting Database Description and Link State
     Request packets.  The default value is 5 seconds.

 -- Interface Command: ip ospf transmit-delay
 -- Interface Command: no ip ospf transmit-delay
     Set number of seconds for InfTransDelay value.  LSAs' age should be
     incremented by this value when transmitting.  The default value is
     1 seconds.


File: quagga.info,  Node: Redistribute routes to OSPF,  Next: Showing OSPF information,  Prev: OSPF interface,  Up: OSPFv2

7.5 Redistribute routes to OSPF
===============================

 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp)
 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp)
ROUTE-MAP
 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp)
metric-type (1|2)
 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp)
metric-type (1|2) route-map WORD
 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp) metric
<0-16777214>
 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp) metric
<0-16777214> route-map WORD
 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp)
metric-type (1|2) metric <0-16777214>
 -- OSPF Command: redistribute (kernel|connected|static|rip|bgp)
metric-type (1|2) metric <0-16777214> route-map WORD
 -- OSPF Command: no redistribute (kernel|connected|static|rip|bgp)
     Redistribute routes of the specified protocol or kind into OSPF,
     with the metric type and metric set if specified, filtering the
     routes using the given route-map if specified.

 -- OSPF Command: default-information originate
 -- OSPF Command: default-information originate metric <0-16777214>
 -- OSPF Command: default-information originate metric <0-16777214>
metric-type (1|2)
 -- OSPF Command: default-information originate metric <0-16777214>
metric-type (1|2) route-map WORD
 -- OSPF Command: default-information originate always
 -- OSPF Command: default-information originate always metric
<0-16777214>
 -- OSPF Command: default-information originate always metric
<0-16777214> metric-type (1|2)
 -- OSPF Command: default-information originate always metric
<0-16777214> metric-type (1|2) route-map WORD
 -- OSPF Command: no default-information originate
     Originate an AS-External (type-5) LSA describing a default route
     into all external-routing capable areas, of the specified metric
     and metric type. If the 'always' keyword is given then the default
     is always advertised, even when there is no default present in the
     routing table.

 -- OSPF Command: distribute-list NAME out
(kernel|connected|static|rip|ospf
 -- OSPF Command: no distribute-list NAME out
(kernel|connected|static|rip|ospf

 -- OSPF Command: default-metric <0-16777214>
 -- OSPF Command: no default-metric

 -- OSPF Command: distance <1-255>
 -- OSPF Command: no distance <1-255>

 -- OSPF Command: distance ospf (intra-area|inter-area|external)
          <1-255>
 -- OSPF Command: no distance ospf

 -- Command: router zebra
 -- Command: no router zebra


File: quagga.info,  Node: Showing OSPF information,  Next: Debugging OSPF,  Prev: Redistribute routes to OSPF,  Up: OSPFv2

7.6 Showing OSPF information
============================

 -- Command: show ip ospf
     Show information on a variety of general OSPF and area state and
     configuration information.

 -- Command: show ip ospf interface [INTERFACE]
     Show state and configuration of OSPF the specified interface, or
     all interfaces if no interface is given.

 -- Command: show ip ospf neighbor
 -- Command: show ip ospf neighbor INTERFACE
 -- Command: show ip ospf neighbor detail
 -- Command: show ip ospf neighbor INTERFACE detail

 -- Command: show ip ospf database

 -- Command: show ip ospf database
(asbr-summary|external|network|router|summary)
 -- Command: show ip ospf database
(asbr-summary|external|network|router|summary) LINK-STATE-ID
 -- Command: show ip ospf database
(asbr-summary|external|network|router|summary) LINK-STATE-ID adv-router
ADV-ROUTER
 -- Command: show ip ospf database
(asbr-summary|external|network|router|summary) adv-router ADV-ROUTER
 -- Command: show ip ospf database
(asbr-summary|external|network|router|summary) LINK-STATE-ID
self-originate
 -- Command: show ip ospf database
(asbr-summary|external|network|router|summary) self-originate

 -- Command: show ip ospf database max-age

 -- Command: show ip ospf database self-originate

 -- Command: show ip ospf route
     Show the OSPF routing table, as determined by the most recent SPF
     calculation.


File: quagga.info,  Node: Debugging OSPF,  Next: OSPF Configuration Examples,  Prev: Showing OSPF information,  Up: OSPFv2

7.7 Debugging OSPF
==================

 -- Command: debug ospf packet
(hello|dd|ls-request|ls-update|ls-ack|all) (send|recv) [detail]
 -- Command: no debug ospf packet
(hello|dd|ls-request|ls-update|ls-ack|all) (send|recv) [detail]

 -- Command: debug ospf ism
 -- Command: debug ospf ism (status|events|timers)
 -- Command: no debug ospf ism
 -- Command: no debug ospf ism (status|events|timers)

 -- Command: debug ospf nsm
 -- Command: debug ospf nsm (status|events|timers)
 -- Command: no debug ospf nsm
 -- Command: no debug ospf nsm (status|events|timers)

 -- Command: debug ospf lsa
 -- Command: debug ospf lsa (generate|flooding|refresh)
 -- Command: no debug ospf lsa
 -- Command: no debug ospf lsa (generate|flooding|refresh)

 -- Command: debug ospf zebra
 -- Command: debug ospf zebra (interface|redistribute)
 -- Command: no debug ospf zebra
 -- Command: no debug ospf zebra (interface|redistribute)

 -- Command: show debugging ospf


File: quagga.info,  Node: OSPF Configuration Examples,  Prev: Debugging OSPF,  Up: OSPFv2

7.8 OSPF Configuration Examples
===============================

A simple example, with MD5 authentication enabled:

     !
     interface bge0
      ip ospf authentication message-digest
      ip ospf message-digest-key 1 md5 ABCDEFGHIJK
     !
     router ospf
      network 192.168.0.0/16 area 0.0.0.1
      area 0.0.0.1 authentication message-digest

   An ABR router, with MD5 authentication and performing summarisation
of networks between the areas:

     !
     password ABCDEF
     log file /var/log/quagga/ospfd.log
     service advanced-vty
     !
     interface eth0
      ip ospf authentication message-digest
      ip ospf message-digest-key 1 md5 ABCDEFGHIJK
     !
     interface ppp0
     !
     interface br0
      ip ospf authentication message-digest
      ip ospf message-digest-key 2 md5 XYZ12345
     !
     router ospf
      ospf router-id 192.168.0.1
      redistribute connected
      passive interface ppp0
      network 192.168.0.0/24 area 0.0.0.0
      network 10.0.0.0/16 area 0.0.0.0
      network 192.168.1.0/24 area 0.0.0.1
      area 0.0.0.0 authentication message-digest
      area 0.0.0.0 range 10.0.0.0/16
      area 0.0.0.0 range 192.168.0.0/24
      area 0.0.0.1 authentication message-digest
      area 0.0.0.1 range 10.2.0.0/16
     !


File: quagga.info,  Node: OSPFv3,  Next: BGP,  Prev: OSPFv2,  Up: Top

8 OSPFv3
********

`ospf6d' is a daemon support OSPF version 3 for IPv6 network.  OSPF for
IPv6 is described in RFC2740.

* Menu:

* OSPF6 router::
* OSPF6 area::
* OSPF6 interface::
* Redistribute routes to OSPF6::
* Showing OSPF6 information::
* OSPF6 Configuration Examples::


File: quagga.info,  Node: OSPF6 router,  Next: OSPF6 area,  Up: OSPFv3

8.1 OSPF6 router
================

 -- Command: router ospf6

 -- OSPF6 Command: router-id A.B.C.D
     Set router's Router-ID.

 -- OSPF6 Command: interface IFNAME area AREA
     Bind interface to specified area, and start sending OSPF packets.
     AREA can be specified as 0.


File: quagga.info,  Node: OSPF6 area,  Next: OSPF6 interface,  Prev: OSPF6 router,  Up: OSPFv3

8.2 OSPF6 area
==============

Area support for OSPFv3 is not yet implemented.


File: quagga.info,  Node: OSPF6 interface,  Next: Redistribute routes to OSPF6,  Prev: OSPF6 area,  Up: OSPFv3

8.3 OSPF6 interface
===================

 -- Interface Command: ipv6 ospf6 cost COST
     Sets interface's output cost.  Default value is 1.

 -- Interface Command: ipv6 ospf6 hello-interval HELLOINTERVAL
     Sets interface's Hello Interval.  Default 40

 -- Interface Command: ipv6 ospf6 dead-interval DEADINTERVAL
     Sets interface's Router Dead Interval.  Default value is 40.

 -- Interface Command: ipv6 ospf6 retransmit-interval
          RETRANSMITINTERVAL
     Sets interface's Rxmt Interval.  Default value is 5.

 -- Interface Command: ipv6 ospf6 priority PRIORITY
     Sets interface's Router Priority.  Default value is 1.

 -- Interface Command: ipv6 ospf6 transmit-delay TRANSMITDELAY
     Sets interface's Inf-Trans-Delay.  Default value is 1.


File: quagga.info,  Node: Redistribute routes to OSPF6,  Next: Showing OSPF6 information,  Prev: OSPF6 interface,  Up: OSPFv3

8.4 Redistribute routes to OSPF6
================================

 -- OSPF6 Command: redistribute static
 -- OSPF6 Command: redistribute connected
 -- OSPF6 Command: redistribute ripng


File: quagga.info,  Node: Showing OSPF6 information,  Next: OSPF6 Configuration Examples,  Prev: Redistribute routes to OSPF6,  Up: OSPFv3

8.5 Showing OSPF6 information
=============================

 -- Command: show ipv6 ospf6 [INSTANCE_ID]
     INSTANCE_ID is an optional OSPF instance ID. To see router ID and
     OSPF instance ID, simply type "show ipv6 ospf6 <cr>".

 -- Command: show ipv6 ospf6 database
     This command shows LSA database summary.  You can specify the type
     of LSA.

 -- Command: show ipv6 ospf6 interface
     To see OSPF interface configuration like costs.

 -- Command: show ipv6 ospf6 neighbor
     Shows state and chosen (Backup) DR of neighbor.

 -- Command: show ipv6 ospf6 request-list A.B.C.D
     Shows requestlist of neighbor.

 -- Command: show ipv6 route ospf6
     This command shows internal routing table.


File: quagga.info,  Node: OSPF6 Configuration Examples,  Prev: Showing OSPF6 information,  Up: OSPFv3

8.6 OSPF6 Configuration Examples
================================

Example of ospf6d configured on one interface and area:

     interface eth0
      ipv6 ospf6 instance-id 0
     !
     router ospf6
      router-id 212.17.55.53
      area 0.0.0.0 range 2001:770:105:2::/64
      interface eth0 area 0.0.0.0
     !


File: quagga.info,  Node: BGP,  Next: Configuring Quagga as a Route Server,  Prev: OSPFv3,  Up: Top

9 BGP
*****

BGP stands for a Border Gateway Protocol.  The lastest BGP version is
4.  It is referred as BGP-4.  BGP-4 is one of the Exterior Gateway
Protocols and de-fact standard of Inter Domain routing protocol.  BGP-4
is described in `RFC1771, A Border Gateway Protocol 4 (BGP-4)'.

   Many extensions have been added to `RFC1771'.  `RFC2858,
Multiprotocol Extensions for BGP-4' provides multiprotocol support to
BGP-4.

* Menu:

* Starting BGP::
* BGP router::
* BGP network::
* BGP Peer::
* BGP Peer Group::
* BGP Address Family::
* Autonomous System::
* BGP Communities Attribute::
* BGP Extended Communities Attribute::
* Displaying BGP routes::
* Capability Negotiation::
* Route Reflector::
* Route Server::
* How to set up a 6-Bone connection::
* Dump BGP packets and table::
* BGP Configuration Examples::


File: quagga.info,  Node: Starting BGP,  Next: BGP router,  Up: BGP

9.1 Starting BGP
================

Default configuration file of `bgpd' is `bgpd.conf'.  `bgpd' searches
the current directory first then /etc/quagga/bgpd.conf.  All of bgpd's
command must be configured in `bgpd.conf'.

   `bgpd' specific invocation options are described below.  Common
options may also be specified (*note Common Invocation Options::).

`-p PORT'
`--bgp_port=PORT'
     Set the bgp protocol's port number.

`-r'
`--retain'
     When program terminates, retain BGP routes added by zebra.


File: quagga.info,  Node: BGP router,  Next: BGP network,  Prev: Starting BGP,  Up: BGP

9.2 BGP router
==============

First of all you must configure BGP router with `router bgp' command.
To configure BGP router, you need AS number.  AS number is an
identification of autonomous system.  BGP protocol uses the AS number
for detecting whether the BGP connection is internal one or external
one.

 -- Command: router bgp ASN
     Enable a BGP protocol process with the specified ASN.  After this
     statement you can input any `BGP Commands'.  You can not create
     different BGP process under different ASN without specifying
     `multiple-instance' (*note Multiple instance::).

 -- Command: no router bgp ASN
     Destroy a BGP protocol process with the specified ASN.

 -- BGP: bgp router-id A.B.C.D
     This command specifies the router-ID.  If `bgpd' connects to
     `zebra' it gets interface and address information.  In that case
     default router ID value is selected as the largest IP Address of
     the interfaces.  When `router zebra' is not enabled `bgpd' can't
     get interface information so `router-id' is set to 0.0.0.0.  So
     please set router-id by hand.

* Menu:

* BGP distance::
* BGP decision process::


File: quagga.info,  Node: BGP distance,  Next: BGP decision process,  Up: BGP router

9.2.1 BGP distance
------------------

 -- BGP: distance bgp <1-255> <1-255> <1-255>
     This command change distance value of BGP.  Each argument is
     distance value for external routes, internal routes and local
     routes.

 -- BGP: distance <1-255> A.B.C.D/M
 -- BGP: distance <1-255> A.B.C.D/M WORD
     This command set distance value to


File: quagga.info,  Node: BGP decision process,  Prev: BGP distance,  Up: BGP router

9.2.2 BGP decision process
--------------------------

1. Weight check

2. Local preference check.

3. Local route check.

4. AS path length check.

5. Origin check.

6. MED check.

 -- BGP: bgp bestpath as-path confed
     This command specifies that the length of confederation path sets
     and sequences should should be taken into account during the BGP
     best path decision process.


File: quagga.info,  Node: BGP network,  Next: BGP Peer,  Prev: BGP router,  Up: BGP

9.3 BGP network
===============

* Menu:

* BGP route::
* Route Aggregation::
* Redistribute to BGP::


File: quagga.info,  Node: BGP route,  Next: Route Aggregation,  Up: BGP network

9.3.1 BGP route
---------------

 -- BGP: network A.B.C.D/M
     This command adds the announcement network.
          router bgp 1
           network 10.0.0.0/8
     This configuration example says that network 10.0.0.0/8 will
     be announced to all neighbors.  Some vendors' routers don't
     advertise routes if they aren't present in their IGP routing
     tables; `bgp' doesn't care about IGP routes when announcing its
     routes.

 -- BGP: no network A.B.C.D/M


File: quagga.info,  Node: Route Aggregation,  Next: Redistribute to BGP,  Prev: BGP route,  Up: BGP network

9.3.2 Route Aggregation
-----------------------

 -- BGP: aggregate-address A.B.C.D/M
     This command specifies an aggregate address.

 -- BGP: aggregate-address A.B.C.D/M as-set
     This command specifies an aggregate address.  Resulting routes
     inlucde AS set.

 -- BGP: aggregate-address A.B.C.D/M summary-only
     This command specifies an aggregate address.  Aggreated routes will
     not be announce.

 -- BGP: no aggregate-address A.B.C.D/M


File: quagga.info,  Node: Redistribute to BGP,  Prev: Route Aggregation,  Up: BGP network

9.3.3 Redistribute to BGP
-------------------------

 -- BGP: redistribute kernel
     Redistribute kernel route to BGP process.

 -- BGP: redistribute static
     Redistribute static route to BGP process.

 -- BGP: redistribute connected
     Redistribute connected route to BGP process.

 -- BGP: redistribute rip
     Redistribute RIP route to BGP process.

 -- BGP: redistribute ospf
     Redistribute OSPF route to BGP process.


File: quagga.info,  Node: BGP Peer,  Next: BGP Peer Group,  Prev: BGP network,  Up: BGP

9.4 BGP Peer
============

* Menu:

* Defining Peer::
* BGP Peer commands::
* Peer filtering::


File: quagga.info,  Node: Defining Peer,  Next: BGP Peer commands,  Up: BGP Peer

9.4.1 Defining Peer
-------------------

 -- BGP: neighbor PEER remote-as ASN
     Creates a new neighbor whose remote-as is ASN.  PEER can be an
     IPv4 address or an IPv6 address.
          router bgp 1
           neighbor 10.0.0.1 remote-as 2
     In this case my router, in AS-1, is trying to peer with AS-2
     at 10.0.0.1.

     This command must be the first command used when configuring a
     neighbor.  If the remote-as is not specified, `bgpd' will complain
     like this:
          can't find neighbor 10.0.0.1


File: quagga.info,  Node: BGP Peer commands,  Next: Peer filtering,  Prev: Defining Peer,  Up: BGP Peer

9.4.2 BGP Peer commands
-----------------------

In a `router bgp' clause there are neighbor specific configurations
required.

 -- BGP: neighbor PEER shutdown
 -- BGP: no neighbor PEER shutdown
     Shutdown the peer.  We can delete the neighbor's configuration by
     `no neighbor PEER remote-as AS-NUMBER' but all configuration of
     the neighbor will be deleted.  When you want to preserve the
     configuration, but want to drop the BGP peer, use this syntax.

 -- BGP: neighbor PEER ebgp-multihop
 -- BGP: no neighbor PEER ebgp-multihop

 -- BGP: neighbor PEER description ...
 -- BGP: no neighbor PEER description ...
     Set description of the peer.

 -- BGP: neighbor PEER version VERSION
     Set up the neighbor's BGP version.  VERSION can be 4, 4+ or 4-.
     BGP version 4 is the default value used for BGP peering.  BGP
     version 4+ means that the neighbor supports Multiprotocol
     Extensions for BGP-4.  BGP version 4- is similar but the neighbor
     speaks the old Internet-Draft revision 00's Multiprotocol
     Extensions for BGP-4.  Some routing software is still using this
     version.

 -- BGP: neighbor PEER interface IFNAME
 -- BGP: no neighbor PEER interface IFNAME
     When you connect to a BGP peer over an IPv6 link-local address,
     you have to specify the IFNAME of the interface used for the
     connection.

 -- BGP: neighbor PEER next-hop-self
 -- BGP: no neighbor PEER next-hop-self
     This command specifies an announced route's nexthop as being
     equivalent to the address of the bgp router.

 -- BGP: neighbor PEER update-source
 -- BGP: no neighbor PEER update-source

 -- BGP: neighbor PEER default-originate
 -- BGP: no neighbor PEER default-originate
     `bgpd''s default is to not announce the default route (0.0.0.0/0)
     even it is in routing table.  When you want to announce default
     routes to the peer, use this command.

 -- BGP: neighbor PEER port PORT
 -- BGP: neighbor PEER port PORT

 -- BGP: neighbor PEER send-community
 -- BGP: neighbor PEER send-community

 -- BGP: neighbor PEER weight WEIGHT
 -- BGP: no neighbor PEER weight WEIGHT
     This command specifies a default WEIGHT value for the neighbor's
     routes.

 -- BGP: neighbor PEER maximum-prefix NUMBER
 -- BGP: no neighbor PEER maximum-prefix NUMBER


File: quagga.info,  Node: Peer filtering,  Prev: BGP Peer commands,  Up: BGP Peer

9.4.3 Peer filtering
--------------------

 -- BGP: neighbor PEER distribute-list NAME [in|out]
     This command specifies a distribute-list for the peer.  DIRECT is
     `in' or `out'.

 -- BGP command: neighbor PEER prefix-list NAME [in|out]

 -- BGP command: neighbor PEER filter-list NAME [in|out]

 -- BGP: neighbor PEER route-map NAME [in|out]
     Apply a route-map on the neighbor.  DIRECT must be `in' or `out'.


File: quagga.info,  Node: BGP Peer Group,  Next: BGP Address Family,  Prev: BGP Peer,  Up: BGP

9.5 BGP Peer Group
==================

 -- BGP: neighbor WORD peer-group
     This command defines a new peer group.

 -- BGP: neighbor PEER peer-group WORD
     This command bind specific peer to peer group WORD.


File: quagga.info,  Node: BGP Address Family,  Next: Autonomous System,  Prev: BGP Peer Group,  Up: BGP

9.6 BGP Address Family
======================


File: quagga.info,  Node: Autonomous System,  Next: BGP Communities Attribute,  Prev: BGP Address Family,  Up: BGP

9.7 Autonomous System
=====================

The AS (Autonomous System) number is one of the essential element of
BGP.  BGP is a distance vector routing protocol, and the AS-Path
framework provides distance vector metric and loop detection to BGP.
`RFC1930, Guidelines for creation, selection, and registration of an
Autonomous System (AS)' provides some background on the concepts of an
AS.

   The AS number is a two octet value, ranging in value from 1 to 65535.
The AS numbers 64512 through 65535 are defined as private AS numbers.
Private AS numbers must not to be advertised in the global Internet.

* Menu:

* AS Path Regular Expression::
* Display BGP Routes by AS Path::
* AS Path Access List::
* Using AS Path in Route Map::
* Private AS Numbers::


File: quagga.info,  Node: AS Path Regular Expression,  Next: Display BGP Routes by AS Path,  Up: Autonomous System

9.7.1 AS Path Regular Expression
--------------------------------

AS path regular expression can be used for displaying BGP routes and AS
path access list.  AS path regular expression is based on `POSIX
1003.2' regular expressions.  Following description is just a subset of
`POSIX' regular expression.  User can use full `POSIX' regular
expression.  Adding to that special character '_' is added for AS path
regular expression.

`.'
     Matches any single character.

`*'
     Matches 0 or more occurrences of pattern.

`+'
     Matches 1 or more occurrences of pattern.

`?'
     Match 0 or 1 occurrences of pattern.

`^'
     Matches the beginning of the line.

`$'
     Matches the end of the line.

`_'
     Character `_' has special meanings in AS path regular expression.
     It matches to space and comma , and AS set delimiter { and } and AS
     confederation delimiter `(' and `)'.  And it also matches to the
     beginning of the line and the end of the line.  So `_' can be used
     for AS value boundaries match.  `show ip bgp regexp _7675_'
     matches to all of BGP routes which as AS number include 7675.


File: quagga.info,  Node: Display BGP Routes by AS Path,  Next: AS Path Access List,  Prev: AS Path Regular Expression,  Up: Autonomous System

9.7.2 Display BGP Routes by AS Path
-----------------------------------

To show BGP routes which has specific AS path information `show ip bgp'
command can be used.

 -- Command: show ip bgp regexp LINE
     This commands display BGP routes that matches AS path regular
     expression LINE.


File: quagga.info,  Node: AS Path Access List,  Next: Using AS Path in Route Map,  Prev: Display BGP Routes by AS Path,  Up: Autonomous System

9.7.3 AS Path Access List
-------------------------

AS path access list is user defined AS path.

 -- Command: ip as-path access-list WORD {permit|deny} LINE
     This command defines a new AS path access list.

 -- Command: no ip as-path access-list WORD
 -- Command: no ip as-path access-list WORD {permit|deny} LINE


File: quagga.info,  Node: Using AS Path in Route Map,  Next: Private AS Numbers,  Prev: AS Path Access List,  Up: Autonomous System

9.7.4 Using AS Path in Route Map
--------------------------------

 -- Route Map: match as-path WORD

 -- Route Map: set as-path prepend AS-PATH


File: quagga.info,  Node: Private AS Numbers,  Prev: Using AS Path in Route Map,  Up: Autonomous System

9.7.5 Private AS Numbers
------------------------


File: quagga.info,  Node: BGP Communities Attribute,  Next: BGP Extended Communities Attribute,  Prev: Autonomous System,  Up: BGP

9.8 BGP Communities Attribute
=============================

BGP communities attribute is widely used for implementing policy
routing.  Network operators can manipulate BGP communities attribute
based on their network policy.  BGP communities attribute is defined in
`RFC1997, BGP Communities Attribute' and `RFC1998, An Application of
the BGP Community Attribute in Multi-home Routing'.  It is an optional
transitive attribute, therefore local policy can travel through
different autonomous system.

   Communities attribute is a set of communities values.  Each
communities value is 4 octet long.  The following format is used to
define communities value.

`AS:VAL'
     This format represents 4 octet communities value.  `AS' is high
     order 2 octet in digit format.  `VAL' is low order 2 octet in
     digit format.  This format is useful to define AS oriented policy
     value.  For example, `7675:80' can be used when AS 7675 wants to
     pass local policy value 80 to neighboring peer.

`internet'
     `internet' represents well-known communities value 0.

`no-export'
     `no-export' represents well-known communities value `NO_EXPORT'
     (0xFFFFFF01).  All routes carry this value must not be advertised
     to outside a BGP confederation boundary.  If neighboring BGP peer
     is part of BGP confederation, the peer is considered as inside a
     BGP confederation boundary, so the route will be announced to the
     peer.

`no-advertise'
     `no-advertise' represents well-known communities value
     `NO_ADVERTISE'
     (0xFFFFFF02).  All routes carry this value must not be advertise
     to other BGP peers.

`local-AS'
     `local-AS' represents well-known communities value
     `NO_EXPORT_SUBCONFED' (0xFFFFFF03).  All routes carry this value
     must not be advertised to external BGP peers.  Even if the
     neighboring router is part of confederation, it is considered as
     external BGP peer, so the route will not be announced to the peer.

   When BGP communities attribute is received, duplicated communities
value in the communities attribute is ignored and each communities
values are sorted in numerical order.

* Menu:

* BGP Community Lists::
* Numbered BGP Community Lists::
* BGP Community in Route Map::
* Display BGP Routes by Community::
* Using BGP Communities Attribute::


File: quagga.info,  Node: BGP Community Lists,  Next: Numbered BGP Community Lists,  Up: BGP Communities Attribute

9.8.1 BGP Community Lists
-------------------------

BGP community list is a user defined BGP communites attribute list.
BGP community list can be used for matching or manipulating BGP
communities attribute in updates.

   There are two types of community list.  One is standard community
list and another is expanded community list.  Standard community list
defines communities attribute.  Expanded community list defines
communities attribute string with regular expression.  Standard
community list is compiled into binary format when user define it.
Standard community list will be directly compared to BGP communities
attribute in BGP updates.  Therefore the comparison is faster than
expanded community list.

 -- Command: ip community-list standard NAME {permit|deny} COMMUNITY
     This command defines a new standard community list.  COMMUNITY is
     communities value.  The COMMUNITY is compiled into community
     structure.  We can define multiple community list under same name.
     In that case match will happen user defined order.  Once the
     community list matches to communities attribute in BGP updates it
     return permit or deny by the community list definition.  When
     there is no matched entry, deny will be returned.  When COMMUNITY
     is empty it matches to any routes.

 -- Command: ip community-list expanded NAME {permit|deny} LINE
     This command defines a new expanded community list.  LINE is a
     string expression of communities attribute.  LINE can include
     regular expression to match communities attribute in BGP updates.

 -- Command: no ip community-list NAME
 -- Command: no ip community-list standard NAME
 -- Command: no ip community-list expanded NAME
     These commands delete community lists specified by NAME.  All of
     community lists shares a single name space.  So community lists
     can be removed simpley specifying community lists name.

 -- Command: show ip community-list
 -- Command: show ip community-list NAME
     This command display current community list information.  When
     NAME is specified the specified community list's information is
     shown.

          # show ip community-list
          Named Community standard list CLIST
              permit 7675:80 7675:100 no-export
              deny internet
          Named Community expanded list EXPAND
              permit :

          # show ip community-list CLIST
          Named Community standard list CLIST
              permit 7675:80 7675:100 no-export
              deny internet


File: quagga.info,  Node: Numbered BGP Community Lists,  Next: BGP Community in Route Map,  Prev: BGP Community Lists,  Up: BGP Communities Attribute

9.8.2 Numbered BGP Community Lists
----------------------------------

When number is used for BGP community list name, the number has special
meanings.  Community list number in the range from 1 and 99 is standard
community list.  Community list number in the range from 100 to 199 is
expanded community list.  These community lists are called as numbered
community lists.  On the other hand normal community lists is called as
named community lists.

 -- Command: ip community-list <1-99> {permit|deny} COMMUNITY
     This command defines a new community list.  <1-99> is standard
     community list number.  Community list name within this range
     defines standard community list.  When COMMUNITY is empty it
     matches to any routes.

 -- Command: ip community-list <100-199> {permit|deny} COMMUNITY
     This command defines a new community list.  <100-199> is expanded
     community list number.  Community list name within this range
     defines expanded community list.

 -- Command: ip community-list NAME {permit|deny} COMMUNITY
     When community list type is not specifed, the community list type
     is automatically detected.  If COMMUNITY can be compiled into
     communities attribute, the community list is defined as a standard
     community list.  Otherwise it is defined as an expanded community
     list.  This feature is left for backward compability.  Use of this
     feature is not recommended.


File: quagga.info,  Node: BGP Community in Route Map,  Next: Display BGP Routes by Community,  Prev: Numbered BGP Community Lists,  Up: BGP Communities Attribute

9.8.3 BGP Community in Route Map
--------------------------------

In Route Map (*note Route Map::), we can match or set BGP communities
attribute.  Using this feature network operator can implement their
network policy based on BGP communities attribute.

   Following commands can be used in Route Map.

 -- Route Map: match community WORD
 -- Route Map: match community WORD exact-match
     This command perform match to BGP updates using community list
     WORD.  When the one of BGP communities value match to the one of
     communities value in community list, it is match.  When
     `exact-match' keyword is spcified, match happen only when BGP
     updates have completely same communities value specified in the
     community list.

 -- Route Map: set community none
 -- Route Map: set community COMMUNITY
 -- Route Map: set community COMMUNITY additive
     This command manipulate communities value in BGP updates.  When
     `none' is specified as communities value, it removes entire
     communities attribute from BGP updates.  When COMMUNITY is not
     `none', specified communities value is set to BGP updates.  If BGP
     updates already has BGP communities value, the existing BGP
     communities value is replaced with specified COMMUNITY value.
     When `additive' keyword is specified, COMMUNITY is appended to the
     existing communities value.

 -- Route Map: set comm-list WORD delete
     This command remove communities value from BGP communities
     attribute.  The WORD is community list name.  When BGP route's
     communities value matches to the community list WORD, the
     communities value is removed.  When all of communities value is
     removed eventually, the BGP update's communities attribute is
     completely removed.


File: quagga.info,  Node: Display BGP Routes by Community,  Next: Using BGP Communities Attribute,  Prev: BGP Community in Route Map,  Up: BGP Communities Attribute

9.8.4 Display BGP Routes by Community
-------------------------------------

To show BGP routes which has specific BGP communities attribute, `show
ip bgp' command can be used.  The COMMUNITY value and community list
can be used for `show ip bgp' command.

 -- Command: show ip bgp community
 -- Command: show ip bgp community COMMUNITY
 -- Command: show ip bgp community COMMUNITY exact-match
     `show ip bgp community' displays BGP routes which has communities
     attribute.  When COMMUNITY is specified, BGP routes that matches
     COMMUNITY value is displayed.  For this command, `internet'
     keyword can't be used for COMMUNITY value.  When `exact-match' is
     specified, it display only routes that have an exact match.

 -- Command: show ip bgp community-list WORD
 -- Command: show ip bgp community-list WORD exact-match
     This commands display BGP routes that matches community list WORD.
     When `exact-match' is specified, display only routes that have an
     exact match.


File: quagga.info,  Node: Using BGP Communities Attribute,  Prev: Display BGP Routes by Community,  Up: BGP Communities Attribute

9.8.5 Using BGP Communities Attribute
-------------------------------------

Following configuration is the most typical usage of BGP communities
attribute.  AS 7675 provides upstream Internet connection to AS 100.
When following configuration exists in AS 7675, AS 100 networks
operator can set local preference in AS 7675 network by setting BGP
communities attribute to the updates.

     router bgp 7675
      neighbor 192.168.0.1 remote-as 100
      neighbor 192.168.0.1 route-map RMAP in
     !
     ip community-list 70 permit 7675:70
     ip community-list 70 deny
     ip community-list 80 permit 7675:80
     ip community-list 80 deny
     ip community-list 90 permit 7675:90
     ip community-list 90 deny
     !
     route-map RMAP permit 10
      match community 70
      set local-preference 70
     !
     route-map RMAP permit 20
      match community 80
      set local-preference 80
     !
     route-map RMAP permit 30
      match community 90
      set local-preference 90

   Following configuration announce 10.0.0.0/8 from AS 100 to AS 7675.
The route has communities value 7675:80 so when above configuration
exists in AS 7675, announced route's local preference will be set to
value 80.

     router bgp 100
      network 10.0.0.0/8
      neighbor 192.168.0.2 remote-as 7675
      neighbor 192.168.0.2 route-map RMAP out
     !
     ip prefix-list PLIST permit 10.0.0.0/8
     !
     route-map RMAP permit 10
      match ip address prefix-list PLIST
      set community 7675:80

   Following configuration is an example of BGP route filtering using
communities attribute.  This configuration only permit BGP routes which
has BGP communities value 0:80 or 0:90.  Network operator can put
special internal communities value at BGP border router, then limit the
BGP routes announcement into the internal network.

     router bgp 7675
      neighbor 192.168.0.1 remote-as 100
      neighbor 192.168.0.1 route-map RMAP in
     !
     ip community-list 1 permit 0:80 0:90
     !
     route-map RMAP permit in
      match community 1

   Following exmaple filter BGP routes which has communities value 1:1.
When there is no match community-list returns deny.  To avoid filtering
all of routes, we need to define permit any at last.

     router bgp 7675
      neighbor 192.168.0.1 remote-as 100
      neighbor 192.168.0.1 route-map RMAP in
     !
     ip community-list standard FILTER deny 1:1
     ip community-list standard FILTER permit
     !
     route-map RMAP permit 10
      match community FILTER

   Communities value keyword `internet' has special meanings in
standard community lists.  In below example `internet' act as match
any.  It matches all of BGP routes even if the route does not have
communities attribute at all.  So community list `INTERNET' is same as
above example's `FILTER'.

     ip community-list standard INTERNET deny 1:1
     ip community-list standard INTERNET permit internet

   Following configuration is an example of communities value deletion.
With this configuration communities value 100:1 and 100:2 is removed
from BGP updates.  For communities value deletion, only `permit'
community-list is used.  `deny' community-list is ignored.

     router bgp 7675
      neighbor 192.168.0.1 remote-as 100
      neighbor 192.168.0.1 route-map RMAP in
     !
     ip community-list standard DEL permit 100:1 100:2
     !
     route-map RMAP permit 10
      set comm-list DEL delete


File: quagga.info,  Node: BGP Extended Communities Attribute,  Next: Displaying BGP routes,  Prev: BGP Communities Attribute,  Up: BGP

9.9 BGP Extended Communities Attribute
======================================

BGP extended communities attribute is introduced with MPLS VPN/BGP
technology.  MPLS VPN/BGP expands capability of network infrastructure
to provide VPN functionality.  At the same time it requires a new
framework for policy routing.  With BGP Extended Communities Attribute
we can use Route Target or Site of Origin for implementing network
policy for MPLS VPN/BGP.

   BGP Extended Communities Attribute is similar to BGP Communities
Attribute.  It is an optional transitive attribute.  BGP Extended
Communities Attribute can carry multiple Extended Community value.
Each Extended Community value is eight octet length.

   BGP Extended Communities Attribute provides an extended range
compared with BGP Communities Attribute.  Adding to that there is a
type field in each value to provides community space structure.

   There are two format to define Extended Community value.  One is AS
based format the other is IP address based format.

`AS:VAL'
     This is a format to define AS based Extended Community value.
     `AS' part is 2 octets Global Administrator subfield in Extended
     Community value.  `VAL' part is 4 octets Local Administrator
     subfield.  `7675:100' represents AS 7675 policy value 100.

`IP-Address:VAL'
     This is a format to define IP address based Extended Community
     value.  `IP-Address' part is 4 octets Global Administrator
     subfield.  `VAL' part is 2 octets Local Administrator subfield.
     `10.0.0.1:100' represents

* Menu:

* BGP Extended Community Lists::
* BGP Extended Communities in Route Map::


File: quagga.info,  Node: BGP Extended Community Lists,  Next: BGP Extended Communities in Route Map,  Up: BGP Extended Communities Attribute

9.9.1 BGP Extended Community Lists
----------------------------------

Expanded Community Lists is a user defined BGP Expanded Community Lists.

 -- Command: ip extcommunity-list standard NAME {permit|deny}
EXTCOMMUNITY
     This command defines a new standard extcommunity-list.
     EXTCOMMUNITY is extended communities value.  The EXTCOMMUNITY is
     compiled into extended community structure.  We can define
     multiple extcommunity-list under same name.  In that case match
     will happen user defined order.  Once the extcommunity-list
     matches to extended communities attribute in BGP updates it return
     permit or deny based upon the extcommunity-list definition.  When
     there is no matched entry, deny will be returned.  When
     EXTCOMMUNITY is empty it matches to any routes.

 -- Command: ip extcommunity-list expanded NAME {permit|deny} LINE
     This command defines a new expanded extcommunity-list.  LINE is a
     string expression of extended communities attribute.  LINE can
     include regular expression to match extended communities attribute
     in BGP updates.

 -- Command: no ip extcommunity-list NAME
 -- Command: no ip extcommunity-list standard NAME
 -- Command: no ip extcommunity-list expanded NAME
     These commands delete extended community lists specified by NAME.
     All of extended community lists shares a single name space.  So
     extended community lists can be removed simpley specifying the
     name.

 -- Command: show ip extcommunity-list
 -- Command: show ip extcommunity-list NAME
     This command display current extcommunity-list information.  When
     NAME is specified the community list's information is shown.

          # show ip extcommunity-list


File: quagga.info,  Node: BGP Extended Communities in Route Map,  Prev: BGP Extended Community Lists,  Up: BGP Extended Communities Attribute

9.9.2 BGP Extended Communities in Route Map
-------------------------------------------

 -- Route Map: match extcommunity WORD

 -- Route Map: set extcommunity rt EXTCOMMUNITY
     This command set Route Target value.

 -- Route Map: set extcommunity soo EXTCOMMUNITY
     This command set Site of Origin value.


File: quagga.info,  Node: Displaying BGP routes,  Next: Capability Negotiation,  Prev: BGP Extended Communities Attribute,  Up: BGP

9.10 Displaying BGP Routes
==========================

* Menu:

* Show IP BGP::
* More Show IP BGP::


File: quagga.info,  Node: Show IP BGP,  Next: More Show IP BGP,  Up: Displaying BGP routes

9.10.1 Show IP BGP
------------------

 -- Command: show ip bgp
 -- Command: show ip bgp A.B.C.D
 -- Command: show ip bgp X:X::X:X
     This command displays BGP routes.  When no route is specified it
     display all of IPv4 BGP routes.

     BGP table version is 0, local router ID is 10.1.1.1
     Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
     Origin codes: i - IGP, e - EGP, ? - incomplete

        Network          Next Hop            Metric LocPrf Weight Path
     *> 1.1.1.1/32       0.0.0.0                  0         32768 i

     Total number of prefixes 1


File: quagga.info,  Node: More Show IP BGP,  Prev: Show IP BGP,  Up: Displaying BGP routes

9.10.2 More Show IP BGP
-----------------------

 -- Command: show ip bgp regexp LINE
     This command display BGP routes using AS path regular expression
     (*note Display BGP Routes by AS Path::).

 -- Command: show ip bgp community COMMUNITY
 -- Command: show ip bgp community COMMUNITY exact-match
     This command display BGP routes using COMMUNITY (*note Display BGP
     Routes by Community::).

 -- Command: show ip bgp community-list WORD
 -- Command: show ip bgp community-list WORD exact-match
     This command display BGP routes using community list (*note
     Display BGP Routes by Community::).

 -- Command: show ip bgp summary

 -- Command: show ip bgp neighbor [PEER]

 -- Command: clear ip bgp PEER
     Clear peers which have addresses of X.X.X.X

 -- Command: clear ip bgp PEER soft in
     Clear peer using soft reconfiguration.

 -- Command: show debug

 -- Command: debug event

 -- Command: debug update

 -- Command: debug keepalive

 -- Command: no debug event

 -- Command: no debug update

 -- Command: no debug keepalive


File: quagga.info,  Node: Capability Negotiation,  Next: Route Reflector,  Prev: Displaying BGP routes,  Up: BGP

9.11 Capability Negotiation
===========================

When adding IPv6 routing information exchange feature to BGP.  There
were some proposals.  IETF (Internet Engineering Task Force) IDR (Inter
Domain Routing) WG (Working group) adopted a proposal called
Multiprotocol Extension for BGP.  The specification is described in
`RFC2283'.  The protocol does not define new protocols.  It defines new
attributes to existing BGP.  When it is used exchanging IPv6 routing
information it is called BGP-4+.  When it is used for exchanging
multicast routing information it is called MBGP.

   `bgpd' supports Multiprotocol Extension for BGP.  So if remote peer
supports the protocol, `bgpd' can exchange IPv6 and/or multicast
routing information.

   Traditional BGP did not have the feature to detect remote peer's
capabilities, e.g. whether it can handle prefix types other than IPv4
unicast routes.  This was a big problem using Multiprotocol Extension
for BGP to operational network.  `RFC2842, Capabilities Advertisement
with BGP-4' adopted a feature called Capability Negotiation. `bgpd' use
this Capability Negotiation to detect the remote peer's capabilities.
If the peer is only configured as IPv4 unicast neighbor, `bgpd' does
not send these Capability Negotiation packets (at least not unless
other optional BGP features require capability negotation).

   By default, Quagga will bring up peering with minimal common
capability for the both sides.  For example, local router has unicast
and multicast capabilitie and remote router has unicast capability.  In
this case, the local router will establish the connection with unicast
only capability. When there are no common capabilities, Quagga sends
Unsupported Capability error and then resets the connection.

   If you want to completely match capabilities with remote peer.
Please use `strict-capability-match' command.

 -- BGP: neighbor PEER strict-capability-match
 -- BGP: no neighbor PEER strict-capability-match
     Strictly compares remote capabilities and local capabilities.  If
     capabilities are different, send Unsupported Capability error then
     reset connection.

   You may want to disable sending Capability Negotiation OPEN message
optional parameter to the peer when remote peer does not implement
Capability Negotiation.  Please use `dont-capability-negotiate' command
to disable the feature.

 -- BGP: neighbor PEER dont-capability-negotiate
 -- BGP: no neighbor PEER dont-capability-negotiate
     Suppress sending Capability Negotiation as OPEN message optional
     parameter to the peer.  This command only affects the peer is
     configured other than IPv4 unicast configuration.

   When remote peer does not have capability negotiation feature, remote
peer will not send any capabilities at all.  In that case, bgp
configures the peer with configured capabilities.

   You may prefer locally configured capabilities more than the
negotiated capabilities even though remote peer sends capabilities.  If
the peer is configured by `override-capability', `bgpd' ignores
received capabilities then override negotiated capabilities with
configured values.

 -- BGP: neighbor PEER override-capability
 -- BGP: no neighbor PEER override-capability
     Override the result of Capability Negotiation with local
     configuration.  Ignore remote peer's capability value.


File: quagga.info,  Node: Route Reflector,  Next: Route Server,  Prev: Capability Negotiation,  Up: BGP

9.12 Route Reflector
====================

 -- BGP: bgp cluster-id A.B.C.D

 -- BGP: neighbor PEER route-reflector-client
 -- BGP: no neighbor PEER route-reflector-client


File: quagga.info,  Node: Route Server,  Next: How to set up a 6-Bone connection,  Prev: Route Reflector,  Up: BGP

9.13 Route Server
=================

At an Internet Exchange point, many ISPs are connected to each other by
external BGP peering.  Normally these external BGP connection are done
by `full mesh' method.  As with internal BGP full mesh formation, this
method has a scaling problem.

   This scaling problem is well known.  Route Server is a method to
resolve the problem.  Each ISP's BGP router only peers to Route Server.
Route Server serves as BGP information exchange to other BGP routers.
By applying this method, numbers of BGP connections is reduced from
O(n*(n-1)/2) to O(n).

   Unlike normal BGP router, Route Server must have several routing
tables for managing different routing policies for each BGP speaker.
We call the routing tables as different `view's.  `bgpd' can work as
normal BGP router or Route Server or both at the same time.

* Menu:

* Multiple instance::
* BGP instance and view::
* Routing policy::
* Viewing the view::


File: quagga.info,  Node: Multiple instance,  Next: BGP instance and view,  Up: Route Server

9.13.1 Multiple instance
------------------------

To enable multiple view function of `bgpd', you must turn on multiple
instance feature beforehand.

 -- Command: bgp multiple-instance
     Enable BGP multiple instance feature.  After this feature is
     enabled, you can make multiple BGP instances or multiple BGP views.

 -- Command: no bgp multiple-instance
     Disable BGP multiple instance feature.  You can not disable this
     feature when BGP multiple instances or views exist.

   When you want to make configuration more Cisco like one,

 -- Command: bgp config-type cisco
     Cisco compatible BGP configuration output.

   When bgp config-type cisco is specified,

   "no synchronization" is displayed.  "no auto-summary" is desplayed.

   "network" and "aggregate-address" argument is displayed as "A.B.C.D
M.M.M.M"

   Quagga: network 10.0.0.0/8 Cisco: network 10.0.0.0

   Quagga: aggregate-address 192.168.0.0/24 Cisco: aggregate-address
192.168.0.0 255.255.255.0

   Community attribute handling is also different.  If there is no
configuration is specified community attribute and extended community
attribute are sent to neighbor.  When user manually disable the feature
community attribute is not sent to the neighbor.  In case of `bgp
config-type cisco' is specified, community attribute is not sent to the
neighbor by default.  To send community attribute user has to specify
`neighbor A.B.C.D send-community' command.

     !
     router bgp 1
      neighbor 10.0.0.1 remote-as 1
      no neighbor 10.0.0.1 send-community
     !
     router bgp 1
      neighbor 10.0.0.1 remote-as 1
      neighbor 10.0.0.1 send-community
     !

 -- Command: bgp config-type zebra
     Quagga style BGP configuration.  This is default.


File: quagga.info,  Node: BGP instance and view,  Next: Routing policy,  Prev: Multiple instance,  Up: Route Server

9.13.2 BGP instance and view
----------------------------

BGP instance is a normal BGP process.  The result of route selection
goes to the kernel routing table.  You can setup different AS at the
same time when BGP multiple instance feature is enabled.

 -- Command: router bgp AS-NUMBER
     Make a new BGP instance.  You can use arbitrary word for the NAME.

     bgp multiple-instance
     !
     router bgp 1
      neighbor 10.0.0.1 remote-as 2
      neighbor 10.0.0.2 remote-as 3
     !
     router bgp 2
      neighbor 10.0.0.3 remote-as 4
      neighbor 10.0.0.4 remote-as 5

   BGP view is almost same as normal BGP process. The result of route
selection does not go to the kernel routing table.  BGP view is only
for exchanging BGP routing information.

 -- Command: router bgp AS-NUMBER view NAME
     Make a new BGP view.  You can use arbitrary word for the NAME.
     This view's route selection result does not go to the kernel
     routing table.

   With this command, you can setup Route Server like below.

     bgp multiple-instance
     !
     router bgp 1 view 1
      neighbor 10.0.0.1 remote-as 2
      neighbor 10.0.0.2 remote-as 3
     !
     router bgp 2 view 2
      neighbor 10.0.0.3 remote-as 4
      neighbor 10.0.0.4 remote-as 5


File: quagga.info,  Node: Routing policy,  Next: Viewing the view,  Prev: BGP instance and view,  Up: Route Server

9.13.3 Routing policy
---------------------

You can set different routing policy for a peer.  For example, you can
set different filter for a peer.

     bgp multiple-instance
     !
     router bgp 1 view 1
      neighbor 10.0.0.1 remote-as 2
      neighbor 10.0.0.1 distribute-list 1 in
     !
     router bgp 1 view 2
      neighbor 10.0.0.1 remote-as 2
      neighbor 10.0.0.1 distribute-list 2 in

   This means BGP update from a peer 10.0.0.1 goes to both BGP view 1
and view 2.  When the update is inserted into view 1, distribute-list 1
is applied.  On the other hand, when the update is inserted into view 2,
distribute-list 2 is applied.


File: quagga.info,  Node: Viewing the view,  Prev: Routing policy,  Up: Route Server

9.13.4 Viewing the view
-----------------------

To display routing table of BGP view, you must specify view name.

 -- Command: show ip bgp view NAME
     Display routing table of BGP view NAME.


File: quagga.info,  Node: How to set up a 6-Bone connection,  Next: Dump BGP packets and table,  Prev: Route Server,  Up: BGP

9.14 How to set up a 6-Bone connection
======================================

     zebra configuration
     ===================
     !
     ! Actually there is no need to configure zebra
     !

     bgpd configuration
     ==================
     !
     ! This means that routes go through zebra and into the kernel.
     !
     router zebra
     !
     ! MP-BGP configuration
     !
     router bgp 7675
      bgp router-id 10.0.0.1
      neighbor 3ffe:1cfa:0:2:2a0:c9ff:fe9e:f56 remote-as AS-NUMBER
     !
      address-family ipv6
      network 3ffe:506::/32
      neighbor 3ffe:1cfa:0:2:2a0:c9ff:fe9e:f56 activate
      neighbor 3ffe:1cfa:0:2:2a0:c9ff:fe9e:f56 route-map set-nexthop out
      neighbor 3ffe:1cfa:0:2:2c0:4fff:fe68:a231 remote-as AS-NUMBER
      neighbor 3ffe:1cfa:0:2:2c0:4fff:fe68:a231 route-map set-nexthop out
      exit-address-family
     !
     ipv6 access-list all permit any
     !
     ! Set output nexthop address.
     !
     route-map set-nexthop permit 10
      match ipv6 address all
      set ipv6 nexthop global 3ffe:1cfa:0:2:2c0:4fff:fe68:a225
      set ipv6 nexthop local fe80::2c0:4fff:fe68:a225
     !
     ! logfile FILENAME is obsolete.  Please use log file FILENAME

     log file bgpd.log
     !


File: quagga.info,  Node: Dump BGP packets and table,  Next: BGP Configuration Examples,  Prev: How to set up a 6-Bone connection,  Up: BGP

9.15 Dump BGP packets and table
===============================

 -- Command: dump bgp all PATH
 -- Command: dump bgp all PATH INTERVAL
     Dump all BGP packet and events to PATH file.

 -- Command: dump bgp updates PATH
 -- Command: dump bgp updates PATH INTERVAL
     Dump BGP updates to PATH file.

 -- Command: dump bgp routes PATH
 -- Command: dump bgp routes PATH
     Dump whole BGP routing table to PATH.  This is heavy process.


File: quagga.info,  Node: BGP Configuration Examples,  Prev: Dump BGP packets and table,  Up: BGP

9.16 BGP Configuration Examples
===============================

Example of a session to an upstream, advertising only one prefix to it.

     router bgp 64512
      bgp router-id 10.236.87.1
      network 10.236.87.0/24
      neighbor upstream peer-group
      neighbor upstream remote-as 64515
      neighbor upstream capability dynamic
      neighbor upstream prefix-list pl-allowed-adv out
      neighbor 10.1.1.1 peer-group upstream
      neighbor 10.1.1.1 description ACME ISP
     !
     ip prefix-list pl-allowed-adv seq 5 permit 82.195.133.0/25
     ip prefix-list pl-allowed-adv seq 10 deny any

   A more complex example. With upstream, peer and customer sessions.
Advertising global prefixes and NO_EXPORT prefixes and providing
actions for customer routes based on community values. Extensive use of
route-maps and the 'call' feature to support selective advertising of
prefixes. This example is intended as guidance only, it has NOT been
tested and almost certainly containts silly mistakes, if not serious
flaws.

     router bgp 64512
      bgp router-id 10.236.87.1
      network 10.123.456.0/24
      network 10.123.456.128/25 route-map rm-no-export
      neighbor upstream capability dynamic
      neighbor upstream route-map rm-upstream-out out
      neighbor cust capability dynamic
      neighbor cust route-map rm-cust-in in
      neighbor cust route-map rm-cust-out out
      neighbor cust send-community both
      neighbor peer capability dynamic
      neighbor peer route-map rm-peer-in in
      neighbor peer route-map rm-peer-out out
      neighbor peer send-community both
      neighbor 10.1.1.1 remote-as 64515
      neighbor 10.1.1.1 peer-group upstream
      neighbor 10.2.1.1 remote-as 64516
      neighbor 10.2.1.1 peer-group upstream
      neighbor 10.3.1.1 remote-as 64517
      neighbor 10.3.1.1 peer-group cust-default
      neighbor 10.3.1.1 description customer1
      neighbor 10.3.1.1 prefix-list pl-cust1-network in
      neighbor 10.4.1.1 remote-as 64518
      neighbor 10.4.1.1 peer-group cust
      neighbor 10.4.1.1 prefix-list pl-cust2-network in
      neighbor 10.4.1.1 description customer2
      neighbor 10.5.1.1 remote-as 64519
      neighbor 10.5.1.1 peer-group peer
      neighbor 10.5.1.1 prefix-list pl-peer1-network in
      neighbor 10.5.1.1 description peer AS 1
      neighbor 10.6.1.1 remote-as 64520
      neighbor 10.6.1.1 peer-group peer
      neighbor 10.6.1.1 prefix-list pl-peer2-network in
      neighbor 10.6.1.1 description peer AS 2
     !
     ip prefix-list pl-default permit 0.0.0.0/0
     !
     ip prefix-list pl-upstream-peers permit 10.1.1.1/32
     ip prefix-list pl-upstream-peers permit 10.2.1.1/32
     !
     ip prefix-list pl-cust1-network permit 10.3.1.0/24
     ip prefix-list pl-cust1-network permit 10.3.2.0/24
     !
     ip prefix-list pl-cust2-network permit 10.4.1.0/24
     !
     ip prefix-list pl-peer1-network permit 10.5.1.0/24
     ip prefix-list pl-peer1-network permit 10.5.2.0/24
     ip prefix-list pl-peer1-network permit 192.168.0.0/24
     !
     ip prefix-list pl-peer2-network permit 10.6.1.0/24
     ip prefix-list pl-peer2-network permit 10.6.2.0/24
     ip prefix-list pl-peer2-network permit 192.168.1.0/24
     ip prefix-list pl-peer2-network permit 192.168.2.0/24
     ip prefix-list pl-peer2-network permit 172.16.1/24
     !
     ip as-path access-list asp-own-as permit ^$
     ip as-path access-list asp-own-as permit _64512_
     !
     ! #################################################################
     ! Match communities we provide actions for, on routes receives from
     ! customers. Communities values of <our-ASN>:X, with X, have actions:
     !
     ! 100 - blackhole the prefix
     ! 200 - set no_export
     ! 300 - advertise only to other customers
     ! 400 - advertise only to upstreams
     ! 500 - set no_export when advertising to upstreams
     ! 2X00 - set local_preference to X00
     !
     ! blackhole the prefix of the route
     ip community-list standard cm-blackhole permit 64512:100
     !
     ! set no-export community before advertising
     ip community-list standard cm-set-no-export permit 64512:200
     !
     ! advertise only to other customers
     ip community-list standard cm-cust-only permit 64512:300
     !
     ! advertise only to upstreams
     ip community-list standard cm-upstream-only permit 64512:400
     !
     ! advertise to upstreams with no-export
     ip community-list standard cm-upstream-noexport permit 64512:500
     !
     ! set local-pref to least significant 3 digits of the community
     ip community-list standard cm-prefmod-100 permit 64512:2100
     ip community-list standard cm-prefmod-200 permit 64512:2200
     ip community-list standard cm-prefmod-300 permit 64512:2300
     ip community-list standard cm-prefmod-400 permit 64512:2400
     ip community-list expanded cme-prefmod-range permit 64512:2...
     !
     ! Informational communities
     !
     ! 3000 - learned from upstream
     ! 3100 - learned from customer
     ! 3200 - learned from peer
     !
     ip community-list standard cm-learnt-upstream permit 64512:3000
     ip community-list standard cm-learnt-cust permit 64512:3100
     ip community-list standard cm-learnt-peer permit 64512:3200
     !
     ! ###################################################################
     ! Utility route-maps
     !
     ! These utility route-maps generally should not used to permit/deny
     ! routes, i.e. they do not have meaning as filters, and hence probably
     ! should be used with 'on-match next'. These all finish with an empty
     ! permit entry so as not interfere with processing in the caller.
     !
     route-map rm-no-export permit 10
      set community additive no-export
     route-map rm-no-export permit 20
     !
     route-map rm-blackhole permit 10
      description blackhole, up-pref and ensure it cant escape this AS
      set ip next-hop 127.0.0.1
      set local-preference 10
      set community additive no-export
     route-map rm-blackhole permit 20
     !
     ! Set local-pref as requested
     route-map rm-prefmod permit 10
      match community cm-prefmod-100
      set local-preference 100
     route-map rm-prefmod permit 20
      match community cm-prefmod-200
      set local-preference 200
     route-map rm-prefmod permit 30
      match community cm-prefmod-300
      set local-preference 300
     route-map rm-prefmod permit 40
      match community cm-prefmod-400
      set local-preference 400
     route-map rm-prefmod permit 50
     !
     ! Community actions to take on receipt of route.
     route-map rm-community-in permit 10
      description check for blackholing, no point continuing if it matches.
      match community cm-blackhole
      call rm-blackhole
     route-map rm-community-in permit 20
      match community cm-set-no-export
      call rm-no-export
      on-match next
     route-map rm-community-in permit 30
      match community cme-prefmod-range
      call rm-prefmod
     route-map rm-community-in permit 40
     !
     ! #####################################################################
     ! Community actions to take when advertising a route.
     ! These are filtering route-maps,
     !
     ! Deny customer routes to upstream with cust-only set.
     route-map rm-community-filt-to-upstream deny 10
      match community cm-learnt-cust
      match community cm-cust-only
     route-map rm-community-filt-to-upstream permit 20
     !
     ! Deny customer routes to other customers with upstream-only set.
     route-map rm-community-filt-to-cust deny 10
      match community cm-learnt-cust
      match community cm-upstream-only
     route-map rm-community-filt-to-cust permit 20
     !
     ! ###################################################################
     ! The top-level route-maps applied to sessions. Further entries could
     ! be added obviously..
     !
     ! Customers
     route-map rm-cust-in permit 10
      call rm-community-in
      on-match next
     route-map rm-cust-in permit 20
      set community additive 64512:3100
     route-map rm-cust-in permit 30
     !
     route-map rm-cust-out permit 10
      call rm-community-filt-to-cust
      on-match next
     route-map rm-cust-out permit 20
     !
     ! Upstream transit ASes
     route-map rm-upstream-out permit 10
      description filter customer prefixes which are marked cust-only
      call rm-community-filt-to-upstream
      on-match next
     route-map rm-upstream-out permit 20
      description only customer routes are provided to upstreams/peers
      match community cm-learnt-cust
     !
     ! Peer ASes
     ! outbound policy is same as for upstream
     route-map rm-peer-out permit 10
      call rm-upstream-out
     !
     route-map rm-peer-in permit 10
      set community additive 64512:3200


File: quagga.info,  Node: Configuring Quagga as a Route Server,  Next: VTY shell,  Prev: BGP,  Up: Top

10 Configuring Quagga as a Route Server
***************************************

The purpose of a Route Server is to centralize the peerings between BGP
speakers. For example if we have an exchange point scenario with four
BGP speakers, each of which maintaining a BGP peering with the other
three (*note fig:full-mesh::), we can convert it into a centralized
scenario where each of the four establishes a single BGP peering
against the Route Server (*note fig:route-server::).

   We will first describe briefly the Route Server model implemented by
Quagga.  We will explain the commands that have been added for
configuring that model. And finally we will show a full example of
Quagga configured as Route Server.

* Menu:

* Description of the Route Server model::
* Commands for configuring a Route Server::
* Example of Route Server Configuration::


File: quagga.info,  Node: Description of the Route Server model,  Next: Commands for configuring a Route Server,  Up: Configuring Quagga as a Route Server

10.1 Description of the Route Server model
==========================================

First we are going to describe the normal processing that BGP
announcements suffer inside a standard BGP speaker, as shown in *Note
fig:normal-processing::, it consists of three steps:

   * When an announcement is received from some peer, the `In' filters
     configured for that peer are applied to the announcement. These
     filters can reject the announcement, accept it unmodified, or
     accept it with some of its attributes modified.

   * The announcements that pass the `In' filters go into the Best Path
     Selection process, where they are compared to other announcements
     referred to the same destination that have been received from
     different peers (in case such other announcements exist). For each
     different destination, the announcement which is selected as the
     best is inserted into the BGP speaker's Loc-RIB.

   * The routes which are inserted in the Loc-RIB are considered for
     announcement to all the peers (except the one from which the route
     came). This is done by passing the routes in the Loc-RIB through
     the `Out' filters corresponding to each peer. These filters can
     reject the route, accept it unmodified, or accept it with some of
     its attributes modified. Those routes which are accepted by the
     `Out' filters of a peer are announced to that peer.


                  _______________________________
                 /    _________     _________    \
From Peer A --->|(A)-|Best     |   |         |-[A]|--->To Peer A
From Peer B --->|(B)-|Path     |-->|Local-RIB|-[B]|--->To Peer B
From Peer C --->|(C)-|Selection|   |         |-[C]|--->To Peer C
From Peer D --->|(D)-|_________|   |_________|-[D]|--->To Peer D
                 \_______________________________/

Key:  (X) - 'In'  Filter applied to Peer X's announcements
      [X] - 'Out' Filter applied to announcements to Peer X

Figure 10.1: Announcement processing inside a "normal" BGP speaker

(RF1)--(RF2)
  | \  / |
  |  \/  |
  |  /\  |
  | /  \ |
(RF3)--(RF4)

Figure 10.2: Full Mesh

(RF1)  (RF2)
    \  /
    [RS]
    /  \
(RF3)  (RF4)

Figure 10.3: Route Server and clients

   Of course we want that the routing tables obtained in each of the
routers are the same when using the route server than when not. But as
a consequence of having a single BGP peering (against the route
server), the BGP speakers can no longer distinguish from/to which peer
each announce comes/goes.  This means that the routers connected to the
route server are not able to apply by themselves the same input/output
filters as in the full mesh scenario, so they have to delegate those
functions to the route server.

   Even more, the "best path" selection must be also performed inside
the route server on behalf of its clients. The reason is that if, after
applying the filters of the announcer and the (potential) receiver, the
route server decides to send to some client two or more different
announcements referred to the same destination, the client will only
retain the last one, considering it as an implicit withdrawal of the
previous announcements for the same destination. This is the expected
behavior of a BGP speaker as defined in `RFC1771', and even though
there are some proposals of mechanisms that permit multiple paths for
the same destination to be sent through a single BGP peering, none are
currently supported by most existing BGP implementations.

   As a consequence a route server must maintain additional information
and perform additional tasks for a RS-client that those necessary for
common BGP peerings. Essentially a route server must:

   * Maintain a separated Routing Information Base (Loc-RIB) for each
     peer configured as RS-client, containing the routes selected as a
     result of the "Best Path Selection" process that is performed on
     behalf of that RS-client.

   * Whenever it receives an announcement from a RS-client, it must
     consider it for the Loc-RIBs of the other RS-clients.

        * This means that for each of them the route server must pass
          the announcement through the appropriate `Out' filter of the
          announcer.

        * Then through the  appropriate `In' filter of the potential
          receiver.

        * Only if the announcement is accepted by both filters it will
          be passed to the "Best Path Selection" process.

        * Finally, it might go into the Loc-RIB of the receiver.

   When we talk about the "appropriate" filter, both the announcer and
the receiver of the route must be taken into account. Suppose that the
route server receives an announcement from client A, and the route
server is considering it for the Loc-RIB of client B. The filters that
should be applied are the same that would be used in the full mesh
scenario, i.e., first the `Out' filter of router A for announcements
going to router B, and then the `In' filter of router B for
announcements coming from router A.

   We call "Export Policy" of a RS-client to the set of `Out' filters
that the client would use if there was no route server. The same
applies for the "Import Policy" of a RS-client and the set of `In'
filters of the client if there was no route server.

   It is also common to demand from a route server that it does not
modify some BGP attributes (next-hop, as-path and MED) that are usually
modified by standard BGP speakers before announcing a route.

   The announcement processing model implemented by Quagga is shown in
*Note fig:rs-processing::. The figure shows a mixture of RS-clients (B,
C and D) with normal BGP peers (A). There are some details that worth
additional comments:

   * Announcements coming from a normal BGP peer are also considered
     for the Loc-RIBs of all the RS-clients. But logically they do not
     pass through any export policy.

   * Those peers that are configured as RS-clients do not receive any
     announce from the `Main' Loc-RIB.

   * Apart from import and export policies, `In' and `Out' filters can
     also be set for RS-clients. `In' filters might be useful when the
     route server has also normal BGP peers. On the other hand, `Out'
     filters for RS-clients are probably unnecessary, but we decided
     not to remove them as they do not hurt anybody (they can always be
     left empty).