[c-nsp] ibgp prefix advertisement

[Dave Temkin]

OK, I haven't had my coffee yet.  Stupid statement in last email.

Disabling sync will get them in the local table of CUSTODIST, but not into
IXROUTER.  You need to either make CUSTODIST a route reflector or mesh
CUSTOACCESS to IXROUTER.

-Dave

On Tue, 8 Aug 2006, Dave Temkin wrote:

> You need to disable synchronization on CUSTOACCESS (no sync in router
> bgp).
>
> Rules of iBGP say every speaker must be meshed.  In your setup, they don't
> really *need* to be, and to overcome this you must disable sync.
> The correct method, however, would be to enable a session directly between
> CUSTOACCESS and IXROUTER.
>
>
> -Dave
>
> On Tue, 8 Aug 2006, Mikisa Richard wrote:
>
> > Hi all,
> >
> > Scenario
> >
> > AS29032--ebgp--CUSTOACESS(41.220.15.253)--ibgp--CUSTODIST(41.220.15.250)--ibgp--IXROUTER(41.220.15.252)
> >
> >
> > Problem is that CUSTODIST receives prefixes from CUSTOACESS but does not
> > advertise them to IXROUTER.
> >
> > from CUSTODIST ....
> >
> > distro#show ip bgp su
> > BGP router identifier 41.220.15.250, local AS number 28941
> > BGP table version is 231, main routing table version 231
> > 29 network entries and 30 paths using 3893 bytes of memory
> > 8 BGP path attribute entries using 480 bytes of memory
> > 5 BGP AS-PATH entries using 120 bytes of memory
> > 0 BGP route-map cache entries using 0 bytes of memory
> > 0 BGP filter-list cache entries using 0 bytes of memory
> > BGP activity 78/633 prefixes, 105/75 paths, scan interval 15 secs
> >
> > Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down
> > State/PfxRcd
> > 41.220.15.252   4 28941     388     370      231    0    0 00:25:14       25
> > 41.220.15.253   4 28941     953     949      231    0    0 15:46:40        5
> >
> >
> > distro#show ip bgp ne 41.220.15.253 ro
> > BGP table version is 231, local router ID is 41.220.15.250
> > Status codes: s suppressed, d damped, h history, * valid, > best, i -
> > internal
> > Origin codes: i - IGP, e - EGP, ? - incomplete
> >
> >     Network          Next Hop            Metric LocPrf Weight Path
> > *>i0.0.0.0          41.220.15.253                 100      0 29032 i
> > *>i41.220.0.0/20    41.220.15.253            0    100      0 29032 i
> > * i41.220.14.0/23   41.220.15.253            0    100      0 i
> > *>i217.212.230.0/23 41.220.15.253                 100      0 29032 i
> > *>i217.212.242.0/23 41.220.15.253                 100      0 29032 i
> >
> > Total number of prefixes 5
> >
> > distro#show ip bgp 217.212.242.0
> > BGP routing table entry for 217.212.242.0/23, version 206
> > Paths: (1 available, best #1, table Default-IP-Routing-Table)
> >    Not advertised to any peer
> >    29032, (received & used)
> >      41.220.15.253 (metric 11) from 41.220.15.253 (41.220.15.253)
> >        Origin IGP, localpref 100, valid, internal, best
> >
> >
> > distro#show ip bgp ne 41.220.15.252 ad
> > distro#
> >
> >
> > Any ideas on why CUSTODIST is not advertising?
> >
> >
>