[c-nsp] BGP received-routes

[Peter Nyamukusa]

Hi Dimitry,

I looks like those routes are originating via your IGP which has a lower AD
than IBGP. In this case do so ip route XX.XX.XX.0/22 to see how that route
is being learnt and injected into the routing table. 

Regards,

Peter


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Dmitry Kiselev
Sent: Saturday, April 28, 2007 10:23 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] BGP received-routes

Hello!

I see strange behaviour with BGP updates on my 7600/sup720
runing 12.2(18)SXF7 IOS.  Seems update message received from BGP
neighbor stored in received-routes but failed to enter actual
RIB. It is very good seen by tracking next-hop attribute:


7600-12.2(18)SXF7#sh ip bgp XX.XX.XX.0/22

BGP routing table entry for XX.XX.XX.0/22, version 3021883
Paths: (12 available, best #9, table Default-IP-Routing-Table)
  Advertised to update-groups:
     4          10
...
  111 222 333
    AA.AA.AA.16 from AA.AA.AA.1 (AA.AA.AA.1)
      Origin IGP, localpref 150, valid, external, best
  111 222 333, (received-only)
    AA.AA.AA.14 from AA.AA.AA.1 (AA.AA.AA.1)
      Origin IGP, localpref 100, valid, external
...


Just "clear in" command fix the issue:


7600-12.2(18)SXF7#clear ip bgp AA.AA.AA.1 in

7600-12.2(18)SXF7#sh ip bgp XX.XX.XX.0/22
BGP routing table entry for XX.XX.XX.0/22, version 3022271
Paths: (12 available, best #9, table Default-IP-Routing-Table)
  Advertised to update-groups:
     4          10
...
  111 222 333
    AA.AA.AA.14 from AA.AA.AA.1 (AA.AA.AA.1)
      Origin IGP, localpref 150, valid, external, best
  111 222 333, (received-only)
    AA.AA.AA.14 from AA.AA.AA.1 (AA.AA.AA.1)
      Origin IGP, localpref 100, valid, external
...

A quick seek on cisco.com/google does not provide any cluefull info :(
Bug is stable and repeatable with few other prefixes at least from two
separate neighbors.

Any ideas? Which additional info needed?


-- 
Dmitry Kiselev
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