[c-nsp] bgp route-reflector

[Danny McPherson]

It might be something to do with the cluster-id configured on
the A & C routers.  Only when using multiple RRs in a single
cluster do you need one (and you may not necessarily need it
then) and the client's should NOT be configured with it regardless.
You should remove it from those routers.  For that matter,
you don't need it on B, as it's automatically be derived from
the RR's BGP Router ID.

Also, verify that client-to-client reflection is not disabled on the
RR (it should be enabled by default).

-danny

On Mar 6, 2007, at 3:54 PM, Mark Kent wrote:

> 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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