[j-nsp] Missing BGP Routes

[Eric Van Tol]

Hi all,
In what instance would a router be missing routes that are advertised to it?  And by missing, I don't mean 'inactive' or 'hidden'.  I have four routers peering through a full-mesh IBGP, one of which is advertising several routes that were received from a route reflector client.  The routes are being sent from the route reflector router to all IBGP sessions and they are seen by only three out of four of the non-client peers.  This one particular "problem" router doesn't have the prefixes anywhere in its RIB.  There are no import policies on IBGP sessions denying any prefixes.

Routes received from route-reflector client:

edge02# run show route receive-protocol bgp 192.168.205.51 

inet.0: 280459 destinations, 1146831 routes (279785 active, 3 holddown, 1448 hidden)
Restart Complete
  Prefix                  Nexthop              MED     Lclpref    AS path
* 172.16.234.0/25        192.168.205.54       0       100        I
* 172.16.236.0/27        192.168.205.55       0       100        I
* 172.16.236.32/28       192.168.205.55       0       100        I
* 172.16.236.48/30       192.168.205.56       0       100        I
* 172.16.236.144/28      192.168.205.55       0       100        I
* 172.16.236.160/29      192.168.205.55       0       100        I
* 172.16.237.128/25      192.168.205.56       0       100        I
* 172.16.239.224/27      192.168.205.51       0       100        I

192.168.206.129 is sending these routes to 192.168.206.128, which is a non-client peer:

edge02# run show route advertising-protocol bgp 192.168.206.128 172.16.236.0/22    

inet.0: 280471 destinations, 1146944 routes (279808 active, 0 holddown, 1399 hidden)
Restart Complete
  Prefix                  Nexthop              MED     Lclpref    AS path
* 172.16.236.0/27        192.168.205.55       0       100        I
* 172.16.236.32/28       192.168.205.55       0       100        I
* 172.16.236.48/30       192.168.205.56       0       100        I
* 172.16.236.144/28      192.168.205.55       0       100        I
* 172.16.236.160/29      192.168.205.55       0       100        I
* 172.16.237.128/25      192.168.205.56       0       100        I
* 172.16.239.224/27      192.168.205.51       0       100        I

192.168.206.128 doesn't show these routes anywhere:

edge01> show route receive-protocol bgp 192.168.206.129 172.16.192.0/18    

inet.0: 280324 destinations, 940059 routes (279811 active, 0 holddown, 1210 hidden)
Restart Complete

edge01> show route receive-protocol bgp 192.168.206.129 172.16.192.0/18 hidden
 
inet.0: 280327 destinations, 940062 routes (279815 active, 0 holddown, 1210 hidden)
Restart Complete

And the view from the other two non-client peers:

core02> show route receive-protocol bgp 192.168.206.129 172.16.192.0/18 table inet.0 

inet.0: 280139 destinations, 567582 routes (279540 active, 0 holddown, 770 hidden)
Restart Complete
  Prefix                  Nexthop              MED     Lclpref    AS path
* 172.16.234.0/25        192.168.205.54       0       100        I
* 172.16.236.0/27        192.168.205.55       0       100        I
* 172.16.236.32/28       192.168.205.55       0       100        I
* 172.16.236.48/30       192.168.205.56       0       100        I
* 172.16.236.144/28      192.168.205.55       0       100        I
* 172.16.237.128/25      192.168.205.56       0       100        I
* 172.16.239.224/27      192.168.205.51       0       100        I

core01> show route receive-protocol bgp 192.168.206.129 172.16.192.0/18 table inet.0 

inet.0: 280147 destinations, 567688 routes (279612 active, 0 holddown, 727 hidden)
Restart Complete
  Prefix                  Nexthop              MED     Lclpref    AS path
* 172.16.234.0/25        192.168.205.54       0       100        I
* 172.16.236.0/27        192.168.205.55       0       100        I
* 172.16.236.32/28       192.168.205.55       0       100        I
* 172.16.236.48/30       192.168.205.56       0       100        I
* 172.16.236.144/28      192.168.205.55       0       100        I
* 172.16.237.128/25      192.168.205.56       0       100        I
* 172.16.239.224/27      192.168.205.51       0       100        I

Thanks,
evt