RE: No Best Path with BGP posted 12/02/2005
Is 18.104.22.168 in the routing table?
More importantly, is it in there with something other than a default route
to get to it?
Seems the router is telling you the problem. :) But of course, right at
the end of time doesn't exactly help in testing things, does it!
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
Sent: Friday, December 02, 2005 8:42 PM
To: Cisco certification
Subject: No Best Path with BGP
Wow - is this interesting....sadly it happened right as I got kicked off my
rental rack today....so I need the expertise of the group to help me
Simple BGP topology......
R5(AS 200) -------------R2(AS 300)
I wanted to use a route-map to change the next-hop value of incoming routes
from R5 so that the next hop will be the loopback of R5. By the way - I had
best paths and everything was fine before trying this change....
router bgp 300
neighbor 22.214.171.124 remote-as 200
neighbor 126.96.36.199 route-map HOPPER in no auto-summary !
route-map HOPPER permit 10
set ip next-hop 188.8.131.52
After this config - the next hop does change - but now no BEST PATHs:
R2#show ip bgp
BGP table version is 7, local router ID is 184.108.40.206 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
* 220.127.116.11 18.104.22.168 0 200 254 ?
* 22.214.171.124 126.96.36.199 0 200 254 ?
* 188.8.131.52 184.108.40.206 0 200 254 ?
I try and get some details:
R2#show ip bgp 220.127.116.11
BGP routing table entry for 18.104.22.168/24, version 7
Paths: (1 available, no best path)
Not advertised to any peer
22.214.171.124 (inaccessible) from 126.96.36.199 (188.8.131.52)
Origin incomplete, localpref 100, valid, external
OK - so 184.108.40.206 is inaccessible from 220.127.116.11? My goodness - these
interfaces are on the same router! What gives? Could it be that
18.104.22.168is a Frame Relay interface that is not pingable from the loopback
address ( 22.214.171.124)? OK - I know I am reaching - but I am tired after 10
hours on the rack.....
Can anyone help?
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