From: marvin greenlee (marvin@ccbootcamp.com)
Date: Wed Dec 22 2004 - 17:20:44 GMT-3
Rib failures are generally caused by one of these three reasons:
Route with better AD already in the routing table
Memory failure
Number of VPN routes in VRF exceed limit
It really just means that the router was unable to add the BGP route to the
routing table, even though BGP considers the route 'best'. In addition to
configurations with the network backdoor command, it can also be seen in
certain cases when the BGP administrative distance for the process is
modified with the distance command (assuming that the distance configured is
higher than the IGP route in the routing table). In some of the earlier
12.2T code versions, routes with RIB failures were not sent to any
neighbors.
BGP: Frequently Asked Questions
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094
9e8.shtml#twenty-three
- Marvin Greenlee, CCIE#12237, CCSI# 30483
Network Learning Inc
marvin@ccbootcamp.com
www.ccbootcamp.com (Cisco Training)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of mani
poopal
Sent: Wednesday, December 22, 2004 11:59 AM
To: ccielab@groupstudy.com
Subject: Cisco press LAB-3 BGP back door command [bcc][faked-from]
Importance: Low
Hi all,
In the thei ciscopress lab 3 bgp section, the author is asking to advertise
same routes via ospf and bgp(loopbacks). The books debrief sections
specifies that in the bgp configuration these networks must be specified as
back door option to make IGP routes prefer over bgp routes. When this was
configured, in the router, bgp table is showing r> networks(pls see the
output), is it acceptable to have output like this or any other method to
overcome this bgp table. Scott, Brian and others, pls have a look at the
output and advise.
R4#show ip bgp<------------BEFORE BACKDOOR COMMAND--IS THIS OUTPUT NORMAL
BGP table version is 163, local router ID is 10.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 2.2.2.0/28 10.6.6.6 0 11 10 1 i
*> 3.3.3.0/28 10.6.6.6 0 11 10 1 i
*> 10.1.1.0/28 10.6.6.6 0 11 10 i
*> 10.4.4.0/28 0.0.0.0 0 32768 i
*> 10.5.5.0/28 10.6.6.6 0 11 i
*> 10.6.6.0/28 10.6.6.6 0 0 11 i
*> 10.7.7.0/28 10.6.6.6 0 11 i
*> 10.8.8.0/28 10.6.6.6 0 11 10 i
===============================================================
R4(config-router)#network 10.1.1.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.5.5.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.6.6.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.7.7.0 mask 255.255.255.240 backdoor
R4(config-router)#network 10.8.8.0 mask 255.255.255.240 backdoor
===============================================================
R4#show ip bgp<--------AFTER BACKDOOR COMMAND
BGP table version is 19, local router ID is 10.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 2.2.2.0/28 10.6.6.6 0 11 10 1 i
*> 3.3.3.0/28 10.6.6.6 0 11 10 1 i
r> 10.1.1.0/28 10.6.6.6 0 11 10 i
*> 10.4.4.0/28 0.0.0.0 0 32768 i
r> 10.5.5.0/28 10.6.6.6 0 11 i
r> 10.6.6.0/28 10.6.6.6 0 0 11 i
r> 10.7.7.0/28 10.6.6.6 0 11 i
r> 10.8.8.0/28 10.6.6.6 0 11 10 i
R4#show ip bgp rib-failure
Network Next Hop RIB-failure RIB-NH
Matches
10.1.1.0/28 10.6.6.6 Higher admin distance
No
10.5.5.0/28 10.6.6.6 Higher admin distance
Yes
10.6.6.0/28 10.6.6.6 Higher admin distance
Yes
10.7.7.0/28 10.6.6.6 Higher admin distance
Yes
10.8.8.0/28 10.6.6.6 Higher admin distance
Yes
thanks
Mani
B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
(416)431 9929
MANI_CCIE@YAHOO.COM
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