From: Scott Morris (swm@emanon.com)
Date: Sat Dec 03 2005 - 01:09:31 GMT-3
Is 150.1.5.5 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!
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Anthony Sequeira
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
understand.....
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....
R2#
!
router bgp 300
no synchronization
neighbor 136.1.245.5 remote-as 200
neighbor 136.1.245.5 route-map HOPPER in no auto-summary !
route-map HOPPER permit 10
set ip next-hop 150.1.5.5
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 150.1.2.2 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
* 205.90.31.0 150.1.5.5 0 200 254 ?
* 220.20.3.0 150.1.5.5 0 200 254 ?
* 222.22.2.0 150.1.5.5 0 200 254 ?
I try and get some details:
R2#show ip bgp 222.22.2.0
BGP routing table entry for 222.22.2.0/24, version 7
Paths: (1 available, no best path)
Not advertised to any peer
200 254
150.1.5.5 (inaccessible) from 136.1.245.5 (150.1.5.5)
Origin incomplete, localpref 100, valid, external
OK - so 150.1.5.5 is inaccessible from 136.1.245.5? My goodness - these
interfaces are on the same router! What gives? Could it be that
136.1.245.5is a Frame Relay interface that is not pingable from the loopback
address ( 150.1.5.5)? OK - I know I am reaching - but I am tired after 10
hours on the rack.....
Can anyone help?
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