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authorAndrew Certain <certain@amazon.com>2012-11-07 23:50:07 +0000
committerDavid Lamparter <equinox@opensourcerouting.org>2012-11-30 21:10:00 +0100
commit9d3f9705d8b386ccf006c106967c700141e5d049 (patch)
tree9edfe2653741fa0f49ffef15bd66f5a522dcd025 /ports/pkg/COMMENT
parent3b96b78136d04ddb7e39d86577cad75acb25237a (diff)
bgpd: add replace-as modifier for BGP neighbor
Added replace-as modifier for BGP neighbors when using local-as. If the replace-as modifier is specified, only the replacement AS as specified by the local-as modifier is prepended to the AS_PATH, not the process's AS. In bgp_attr.c, I decided that if (peer->change_local_as) { /* If replace-as is specified, we only use the change_local_as when advertising routes. */ if( ! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) { aspath = aspath_add_seq (aspath, peer->local_as); } aspath = aspath_add_seq (aspath, peer->change_local_as); } else { aspath = aspath_add_seq (aspath, peer->local_as); } was clearer than the alternative that didn't duplicate the prepending of the process's AS: /* First, append the process local AS unless we have an alternate local_as * and we're replacing it (as opposed to just prepending it). */ if (! (peer->change_local_as && CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_REPLACE_AS) ) ) { aspath = aspath_add_seq (aspath, peer->local_as); } if (peer->change_local_as) aspath = aspath_add_seq (aspath, peer->change_local_as); } But I could be convinced otherwise. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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