@c -*-texinfo-*- @c This is part of the GNU Zebra Manual. @c Copyright (C) 1999, 2000 Kunihiro Ishiguro @c See file zebra.texi for copying conditions. @node RIP @comment node-name, next, previous, up @chapter 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 @dfn{distance-vector} protocol and is based on the @dfn{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. @command{ripd} supports RIP version 2 as described in RFC2453 and RIP version 1 as described in RFC1058. @menu * Starting and Stopping ripd:: * RIP Configuration:: * 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:: @end menu @node Starting and Stopping ripd, RIP Configuration, RIP, RIP @comment node-name, next, previous, up @section Starting and Stopping ripd The default configuration file name of @command{ripd}'s is @file{ripd.conf}. When invocation @command{ripd} searches directory @value{INSTALL_PREFIX_ETC}. If @file{ripd.conf} is not there next search current directory. RIP uses UDP port 521 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 @command{zebra} daemon. So running @command{zebra} is mandatory to run @command{ripd}. Thus minimum sequence for running RIP is like below: @example @group # zebra -d # ripd -d @end group @end example Please note that @command{zebra} must be invoked before @command{ripd}. To stop @command{ripd}. Please use @command{kill `cat /var/run/ripd.pid`}. Certain signals have special meaningss to @command{ripd}. @table @samp @item SIGHUP Reload configuration file @file{ripd.conf}. All configurations are reseted. All routes learned so far are cleared and removed from routing table. @item SIGUSR1 Rotate @command{ripd} logfile. @item SIGINT @itemx SIGTERM @command{ripd} sweeps all installed RIP routes then terminates properly. @end table @command{ripd} invocation options. Common options that can be specified (@pxref{Common Invocation Options}). @table @samp @item -r @itemx --retain When the program terminates, retain routes added by @command{ripd}. @end table @menu * RIP netmask:: @end menu @node RIP netmask, , Starting and Stopping ripd, Starting and Stopping ripd @comment node-name, next, previous, up @subsection RIP netmask The netmask features of @command{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. Zebra @command{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. @node RIP Configuration, How to Announce RIP route, Starting and Stopping ripd, RIP @comment node-name, next, previous, up @section RIP Configuration @deffn Command {router rip} {} The @code{router rip} command is necessary to enable RIP. To disable RIP, use the @code{no router rip} command. RIP must be enabled before carrying out any of the RIP commands. @end deffn @deffn Command {no router rip} {} Disable RIP. @end deffn RIP can be configured to process either Version 1 or Version 2 packets, the default mode is Version 2. If no version is specified, then the RIP daemon will default to Version 2. If RIP is set to Version 1, the setting "Version 1" will be displayed, but the setting "Version 2" will not be displayed whether or not Version 2 is set explicitly as the version of RIP being used. The version can be specified globally, and also on a per-interface basis (see below). @deffn {RIP Command} {version @var{version}} {} Set RIP process's version. @var{version} can be `1'' or `2''. @end deffn @deffn {RIP Command} {network @var{network}} {} @deffnx {RIP Command} {no network @var{network}} {} Set the RIP enable interface by @var{network}. The interfaces which have addresses matching with @var{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 @code{no network} command will disable RIP for the specified network. @end deffn @deffn {RIP Command} {network @var{ifname}} {} @deffnx {RIP Command} {no network @var{ifname}} {} Set a RIP enabled interface by @var{ifname}. Both the sending and receiving of RIP packets will be enabled on the port specified in the @code{network ifname} command. The @code{no network ifname} command will disable RIP on the specified interface. @end deffn @deffn {RIP Command} {neighbor @var{a.b.c.d}} {} @deffnx {RIP Command} {no neighbor @var{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 @code{no neighbor a.b.c.d} command will disable the RIP neighbor. @end deffn Below is very simple RIP configuration. Interface @code{eth0} and interface which address match to @code{10.0.0.0/8} are RIP enabled. @example @group ! router rip network 10.0.0.0/8 network eth0 ! @end group @end example Passive interface @deffn {RIP command} {passive-interface (@var{IFNAME}|default)} {} @deffnx {RIP command} {no passive-interface @var{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 @code{neighbor} command. The interface may be specified as @var{default} to make ripd default to passive on all interfaces. The default is to be passive on all interfaces. @end deffn RIP version handling @deffn {Interface command} {ip rip send version @var{version}} {} @var{version} can be `1', `2', `1 2'. This configuration command overrides the router's rip version setting. The command will enable the selected interface to send packets with RIP Version 1, RIP Version 2, or both. In the case of '1 2', packets will be both broadcast and multicast. The default is to send only version 2. @end deffn @deffn {Interface command} {ip rip receive version @var{version}} {} Version setting for incoming RIP packets. This command will enable the selected interface to receive packets in RIP Version 1, RIP Version 2, or both. The default is to receive both versions. @end deffn RIP split-horizon @deffn {Interface command} {ip split-horizon} {} @deffnx {Interface command} {no ip split-horizon} {} Control split-horizon on the interface. Default is @code{ip split-horizon}. If you don't perform split-horizon on the interface, please specify @code{no ip split-horizon}. @end deffn @node How to Announce RIP route, Filtering RIP Routes, RIP Configuration, RIP @comment node-name, next, previous, up @section How to Announce RIP route @deffn {RIP command} {redistribute kernel} {} @deffnx {RIP command} {redistribute kernel metric <0-16>} {} @deffnx {RIP command} {redistribute kernel route-map @var{route-map}} {} @deffnx {RIP command} {no redistribute kernel} {} @code{redistribute kernel} redistributes routing information from kernel route entries into the RIP tables. @code{no redistribute kernel} disables the routes. @end deffn @deffn {RIP command} {redistribute static} {} @deffnx {RIP command} {redistribute static metric <0-16>} {} @deffnx {RIP command} {redistribute static route-map @var{route-map}} {} @deffnx {RIP command} {no redistribute static} {} @code{redistribute static} redistributes routing information from static route entries into the RIP tables. @code{no redistribute static} disables the routes. @end deffn @deffn {RIP command} {redistribute connected} {} @deffnx {RIP command} {redistribute connected metric <0-16>} {} @deffnx {RIP command} {redistribute connected route-map @var{route-map}} {} @deffnx {RIP command} {no redistribute connected} {} Redistribute connected routes into the RIP tables. @code{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. @end deffn @deffn {RIP command} {redistribute ospf} {} @deffnx {RIP command} {redistribute ospf metric <0-16>} {} @deffnx {RIP command} {redistribute ospf route-map @var{route-map}} {} @deffnx {RIP command} {no redistribute ospf} {} @code{redistribute ospf} redistributes routing information from ospf route entries into the RIP tables. @code{no redistribute ospf} disables the routes. @end deffn @deffn {RIP command} {redistribute bgp} {} @deffnx {RIP command} {redistribute bgp metric <0-16>} {} @deffnx {RIP command} {redistribute bgp route-map @var{route-map}} {} @deffnx {RIP command} {no redistribute bgp} {} @code{redistribute bgp} redistributes routing information from bgp route entries into the RIP tables. @code{no redistribute bgp} disables the routes. @end deffn If you want to specify RIP only static routes: @deffn {RIP command} {default-information originate} {} @end deffn @deffn {RIP command} {route @var{a.b.c.d/m}} {} @deffnx {RIP command} {no route @var{a.b.c.d/m}} {} This command is specific to Zebra. The @code{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 Zebra and redistributing it in RIP using @code{redistribute static}. @end deffn @node Filtering RIP Routes, RIP Metric Manipulation, How to Announce RIP route, RIP @comment node-name, next, previous, up @section Filtering RIP Routes RIP routes can be filtered by a distribute-list. @deffn Command {distribute-list @var{access_list} @var{direct} @var{ifname}} {} You can apply access lists to the interface with a @code{distribute-list} command. @var{access_list} is the access list name. @var{direct} is @samp{in} or @samp{out}. If @var{direct} is @samp{in} the access list is applied to input packets. The @code{distribute-list} command can be used to filter the RIP path. @code{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 @samp{eth0} will permit only the paths that match the route 10.0.0.0/8 @example @group ! router rip distribute-list private in eth0 ! access-list private permit 10 10.0.0.0/8 access-list private deny any ! @end group @end example @end deffn @code{distribute-list} can be applied to both incoming and outgoing data. @deffn Command {distribute-list prefix @var{prefix_list} (in|out) @var{ifname}} {} You can apply prefix lists to the interface with a @code{distribute-list} command. @var{prefix_list} is the prefix list name. Next is the direction of @samp{in} or @samp{out}. If @var{direct} is @samp{in} the access list is applied to input packets. @end deffn @node RIP Metric Manipulation, RIP distance, Filtering RIP Routes, RIP @comment node-name, next, previous, up @section RIP Metric Manipulation RIP metric is a value for distance for the network. Usually @command{ripd} increment the metric when the network information is received. Redistributed routes' metric is set to 1. @deffn {RIP command} {default-metric <1-16>} {} @deffnx {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 @command{redistribute connected}. To modify connected route's metric value, please use @command{redistribute connected metric} or @command{route-map}. @command{offset-list} also affects connected routes. @end deffn @deffn {RIP command} {offset-list @var{access-list} (in|out)} {} @deffnx {RIP command} {offset-list @var{access-list} (in|out) @var{ifname}} {} @end deffn @node RIP distance, RIP route-map, RIP Metric Manipulation, RIP @comment node-name, next, previous, up @section RIP distance Distance value is used in zebra daemon. Default RIP distance is 120. @deffn {RIP command} {distance <1-255>} {} @deffnx {RIP command} {no distance <1-255>} {} Set default RIP distance to specified value. @end deffn @deffn {RIP command} {distance <1-255> @var{A.B.C.D/M}} {} @deffnx {RIP command} {no distance <1-255> @var{A.B.C.D/M}} {} Set default RIP distance to specified value when the route's source IP address matches the specified prefix. @end deffn @deffn {RIP command} {distance <1-255> @var{A.B.C.D/M} @var{access-list}} {} @deffnx {RIP command} {no distance <1-255> @var{A.B.C.D/M} @var{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. @end deffn @node RIP route-map, RIP Authentication, RIP distance, RIP @comment node-name, next, previous, up @section RIP route-map Usage of @command{ripd}'s route-map support. Optional argument route-map MAP_NAME can be added to each @code{redistribute} statement. @example redistribute static [route-map MAP_NAME] redistribute connected [route-map MAP_NAME] ..... @end example Cisco applies route-map _before_ routes will exported to rip route table. In current Zebra's test implementation, @command{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 (@pxref{Route Map}) is needed to use route-map functionality. @deffn {Route Map} {match interface @var{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. @end deffn @deffn {Route Map} {match ip address @var{word}} {} @deffnx {Route Map} {match ip address prefix-list @var{word}} {} Match if route destination is permitted by access-list. @end deffn @deffn {Route Map} {match ip next-hop A.B.C.D} {} Cisco uses here , @command{ripd} IPv4 address. Match if route has this next-hop (meaning next-hop listed in the rip route table - "show ip rip") @end deffn @deffn {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. @end deffn @deffn {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. @end deffn @deffn {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. @end deffn @node RIP Authentication, RIP Timers, RIP route-map, RIP @comment node-name, next, previous, up @section RIP Authentication @deffn {Interface command} {ip rip authentication mode md5} {} @deffnx {Interface command} {no ip rip authentication mode md5} {} Set the interface with RIPv2 MD5 authentication. @end deffn @deffn {Interface command} {ip rip authentication mode text} {} @deffnx {Interface command} {no ip rip authentication mode text} {} Set the interface with RIPv2 simple password authentication. @end deffn @deffn {Interface command} {ip rip authentication string @var{string}} {} @deffnx {Interface command} {no ip rip authentication string @var{string}} {} RIP version 2 has simple text authentication. This command sets authentication string. The string must be shorter than 16 characters. @end deffn @deffn {Interface command} {ip rip authentication key-chain @var{key-chain}} {} @deffnx {Interface command} {no ip rip authentication key-chain @var{key-chain}} {} Specifiy Keyed MD5 chain. @end deffn @example ! key chain test key 1 key-string test ! interface eth1 ip rip authentication mode md5 ip rip authentication key-chain test ! @end example @node RIP Timers, Show RIP Information, RIP Authentication, RIP @comment node-name, next, previous, up @section RIP Timers @deffn {RIP command} {timers basic @var{update} @var{timeout} @var{garbage}} {} RIP protocol has several timers. User can configure those timers' values by @code{timers basic} command. The default settings for the timers are as follows: @itemize @bullet @item 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. @item 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. @item The garbage collect timer is 120 seconds. Upon expiration of the garbage-collection timer, the route is finally removed from the routing table. @end itemize The @code{timers basic} command allows the the default values of the timers listed above to be changed. @end deffn @deffn {RIP command} {no timers basic} {} The @code{no timers basic} command will reset the timers to the default settings listed above. @end deffn @node Show RIP Information, RIP Debug Commands, RIP Timers, RIP @comment node-name, next, previous, up @section Show RIP Information To display RIP routes. @deffn Command {show ip rip} {} Show RIP routes. @end deffn 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. @c Exmaple here. @deffn Command {show ip protocols} {} The command displays current RIP status. It includes RIP timer, filtering, version, RIP enabled interface and RIP peer inforation. @end deffn @example @group ripd> @b{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 @end group @end example @node RIP Debug Commands, , Show RIP Information, RIP @comment node-name, next, previous, up @section RIP Debug Commands Debug for RIP protocol. @deffn Command {debug rip events} {} Debug rip events. @end deffn @code{debug rip} will show RIP events. Sending and receiving packets, timers, and changes in interfaces are events shown with @command{ripd}. @deffn Command {debug rip packet} {} Debug rip packet. @end deffn @code{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. @deffn Command {debug rip zebra} {} Debug rip between zebra communication. @end deffn This command will show the communication between @command{ripd} and @command{zebra}. The main information will include addition and deletion of paths to the kernel and the sending and receiving of interface information. @deffn Command {show debugging rip} {} Display @command{ripd}'s debugging option. @end deffn @code{show debugging rip} will show all information currently set for ripd debug.