From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Fri Aug 23 2002 - 14:28:52 GMT-3
Katson,
This is due to some discrepancies in the next-hop values of BGP
and IGP routes. Here is the bug ID that explains it.
CSCdx26714 Bug Details
Headline Rib-Failure,if BGP has the same NH as the IGP
First Found-in Version 12.2(8.5)T
First Fixed-in Version 12.2(10.7)T01, 12.2(10.8)PI05
1. Symptom :
If the prefix get Rib-Failre when installing into bgp table because of
there is already has a prefix in the routing table with a prefered
admin
distance (like already learnd by ospf), then this prefix should not be
advertised to other bgp peers unless the next-hop is the same as the
prefix
in the ip routing table.
But the behavior is that even if the next-hop is the same, this prefix
still
does not advertise to it's bgp peers.
2. Conditions :
You should see the bgp prefix get a "Rib-Failure" in the output of
"show ip bgp <x.x.x.x> ". This will confirm that this prefix fails to
install into the routing table. Then check the next-hop for the bgp
prefix
and the prefix that already in the ip table (it's ospf in this ddts).
If
they are the same, then bgp should still advertise this prfix to it's
bgp
peers.
3. Workaround :
Thers is not workaround for this problem.
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Katson PN Yeung
Sent: Wednesday, August 21, 2002 11:29 PM
To: ccielab@groupstudy.com
Subject: RIB-failure. What is that?
Dear all,
We used 12.2(8)T IOS for interal BGP confederation testing, there are
some
BGP routes marked as "r" and it said it is RIB-failure.
I can't find any info on TAC. Do you know what is this?
Many thanks!
K a t s o n
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