[j-nsp] Missing BGP Routes

[Harry Reynolds]

Normally an as path loop or other sanity check results in this state.
>From the config below does not seem this is the case. Perhaps add
keep-all, restart/soft clear session, and then display hidden. Perhaps
something will jump out.

Does tracing show any errors when the routes are processed?  Unreachable
next hop normally is just hidden so does not seem the case here. Should
not matter, but I normally doe not specify peer-as for an int group.
Again should not break things but worth trying w/o.


HTHs



-----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 10:14 AM
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 
edge01> 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 
core02> 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 
core01> 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
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