[c-nsp] bgp route-reflector
Mark Kent
mark at noc.mainstreet.net
Tue Mar 6 17:54:59 EST 2007
I'm posting this for someone who isn't familiar with this list.
He just turned off "soft-reconfig" on his bgp sessions and now his
route-reflectors appear broken. Before telling him to reload,
I wanted to make sure there isn't a bit of magic I've forgotten:
The setting:
{Internet}<-->A<-->B<-->C<-->{Internet}
AS1 AS34567 AS2
A,B,C are 7206vxr. The configs are simple:
Router A:
router bgp 34567
bgp cluster-id 300
nei x.y.z.77 remote-as 34567
Router B:
router bgp 34567
bgp cluster-id 300
nei x.y.z.49 remote-as 34567
nei x.y.z.49 route-reflector-client
nei x.y.z.78 remote-as 34567
nei x.y.z.78 route-reflector-client
Router C:
router bgp 34567
bgp cluster-id 300
nei x.y.z.50 remote-as 34567
The router in the middle does have a bunch-o'routes from both AS1 and
AS2. If I do "sh ip bg n x.y.z.78 ad" then it shows plenty of routes
being advertized, but on the edge routers themselves, we see:
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
x.y.z.77 4 34567 8241501 13054604 34176418 0 0 00:34:35 0
Zero prefixes... If we clear the bgp session then we see the InQ go
non-zero with each "sh ip bg su" we do but the end result is always 0
prefix received. It's the same situation on both router A and C.
next-hops are known on each router (via ospf).
Versions in use are 12.3(15), 12.2(8)T10 and 12.0(25)S1 (a,b,c).
So, reload time, or a simple oversight in rr config?
[And, Yes, I am suggesting upgrading the IOS before any reload]
Thanks,
-mark
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