From: Mohamed, Liban [NTK] (Liban.Mohamed@sprint.com)
Date: Wed Nov 21 2007 - 02:48:54 ART
Vignesh,
When BGP tries to install the bestpath prefix into Routing Information
Base (RIB) (for example, the IP Routing table), RIB might reject the BGP
route due to any of these reasons:
* Route with better administrative distance already present in IGP.
For example, if a static route already exists in IP Routing table.
* Memory failure.
* The number of routes in VPN routing/forwarding (VRF) exceeds the
route-limit configured under the VRF instance.
In such cases, the prefixes that are rejected for these reasons are
identified by r RIB Failure in the show ip bgp command output and are
not advertised to the peers. This feature was first made available in
Cisco IOS Software Release 12.2(08.05)T.
So in your case you have better admin, hence you can ping, I don't think
you need to be concern on this.
Thanks,
Liban Mohamed
NTAC-IP
Sprint/Nextel
www.sprint.net
liban.mohamed@sprint.com
(W) 678-291-3438
(PCS) 404-441-9701
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
vignesh sethuraman
Sent: Wednesday, November 21, 2007 12:15 AM
To: ccielab@groupstudy.com
Subject: RIB-failure
Hello,
When i view the bgp table, am seeing RIB-failure in the output. But I
am able to ping the address. could you please any 1 explain what is
possible cause for this
Sh ip bgp
r> 152.1.125.0/24 152.1.123.1 0 100 0 (1000) i
r 152.1.123.2 0 100 0
(2000) i
r> 204.12.1.0 152.1.37.7 0 100 0 (7000) i
For eg:
Rack1R3#sh ip bgp 152.1.125.0
BGP routing table entry for 152.1.125.0/24, version 12
Paths: (2 available, best #1, table Default-IP-Routing-Table,
RIB-failure(17))
Advertised to update-groups:
1 2
(1000)
152.1.123.1 (metric 781) from 152.1.123.1 (150.1.1.1)
Origin IGP, metric 0, localpref 100, valid, confed-external, best
(2000)
152.1.123.2 (metric 781) from 152.1.123.2 (150.1.2.2)
Origin IGP, metric 0, localpref 100, valid, confed-external
---------------------------------
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