[j-nsp] Missing BGP Routes

[Varaillon Jean Christophe]

Is the next-hop reachable?


-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Eric Van Tol
Sent: Tuesday, March 17, 2009 7:14 PM
To: juniper-nsp
Subject: [j-nsp] Missing BGP Routes

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
_______________________________________________
juniper-nsp mailing list juniper-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/juniper-nsp