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authorPaul Jakma <paul.jakma@sun.com>2007-08-06 15:24:51 +0000
committerPaul Jakma <paul.jakma@sun.com>2007-08-06 15:24:51 +0000
commit41367172d812354c05b11818346f0d49c2245aef (patch)
treeeb8f83ec0e93cb5a1d8470afd5c79ce55bc853da /doc/bgpd.texi
parent6d58272b4cf96f0daa846210dd2104877900f921 (diff)
[bgpd] Add support for AS_PATHLIMIT / draft-ietf-idr-as-pathlimit
2007-07-31 Paul Jakma <paul.jakma@sun.com> * (general) Support for draft-ietf-idr-as-pathlimit-03. * bgp_attr.h: (struct attr) Add pathlimit struct bgp_attr.c: (attr_str) Add BGP_ATTR_AS_PATHLIMIT string. (attrhash_key_make) tally pathlimit too (attrhash_cmp) cmp pathlimit attr (bgp_attr_aspathlimit) New, parse AS_PATHLIMIT attr. (bgp_attr_parse) ditto (bgp_packet_attribute) Write out AS_PATHLIMIT when set (bgp_dump_routes_attr) ditto * bgp_route.h: (struct bgp_static) Add TTL field * bgp_route.c: (bgp_announce_check) Drop paths that are over their hop-count TTL before sending via EBGP. Mangle ASN in pathlimit for confeds/private as best we can. (bgp_static_update_{rsclient,main}) Add any configure pathlimit information. (bgp_pathlimit_update_parents) New, update atomic-aggr setting for parents of an aspathlimit'ed static. (bgp_static_set) Add TTL argument, for all the 'bgp network' commands. Call previous for TTL changed statics. (bgp_static_unset) Call pathlimit_update_parents. (various bgp network commands) Add 'pathlimit <0-255>' qualifier to all the various forms, bar route-map - which can set ttl itself. * bgp_routemap.c: (general) Add support for 'set pathlimit ttl' and 'match pathlimit as'. * doc/bgpd.texi: Document 'network ... pathlimit <ttl>'
Diffstat (limited to 'doc/bgpd.texi')
-rw-r--r--doc/bgpd.texi25
1 files changed, 24 insertions, 1 deletions
diff --git a/doc/bgpd.texi b/doc/bgpd.texi
index d82f6c37..bdfd6e4c 100644
--- a/doc/bgpd.texi
+++ b/doc/bgpd.texi
@@ -145,10 +145,33 @@ router bgp 1
@end example
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; @code{bgp}
+routes if they aren't present in their IGP routing tables; @code{bgpd}
doesn't care about IGP routes when announcing its routes.
@end deffn
+@deffn {BGP} {network @var{A.B.C.D/M} pathlimit <0-255>} {}
+This command configures a route to be originated into BGP, just as with the
+previous command, but additionally sets an AS-Pathlimit TTL to be advertised
+on the route. See draft-ietf-idr-as-pathlimit.
+
+Specifying a TTL of 0 can be used to remove pathlimit from a previously
+configured network statement.
+
+Note that when advertising prefixes with AS-Pathlimit set, all less-specific
+prefixes advertised SHOULD also have the Atomic-Aggregate attribute set.
+Failure to do so increases the risks of accidental routing loops occuring.
+
+This implementation will try to automatically set Atomic-Aggregate as
+appropriate on any less-specific prefixes originated by the same speaker,
+however it will not (and often can not) do so where @b{other} speakers in
+the AS are originating more specifics.
+
+Hence the system administrator must take care to ensure that all
+less-specific prefixes originated carry atomic-aggregate as appropriate, by
+manually configuring speakers originating less-specifics to set
+Atomic-Aggregate on those advertisements!
+@end deffn
+
@deffn {BGP} {no network @var{A.B.C.D/M}} {}
@end deffn