From: Jian Gu (guxiaojian@gmail.com)
Date: Sat Dec 03 2005 - 01:14:12 GMT-3
R2 won't install BGP routes to routing table if next hop is unaccessible,
don't you have static route to 150.1.5.5?
Did I miss anything?
On 12/2/05, Anthony Sequeira <terry.francona@gmail.com> wrote:
>
> 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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