[c-nsp] Late night BGP puzzler

Manu Chao linux.yahoo at gmail.com
Wed Aug 1 06:38:23 EDT 2007


eBGP prefer to iBGP

On 8/1/07, Peter Kranz <pkranz at unwiredltd.com> wrote:
> I can't for the life of me figure out why this won't select path #2 as the
> best path.. can someone unravel what I'm missing.. My goal is to get it to
> resolve the equal length AS path dispute using the Cost community.
>
> Path #1 is from a directly connected upsteam provider, no OSPF
> Path #2 is from a directly connected peer router, OSPF cost 10
>
> gsr-365-backup#sho ip bgp 6.14.0.0/15
> BGP routing table entry for 6.14.0.0/15, version 19026850
> Paths: (2 available, best #1, table Default-IP-Routing-Table)
>   Advertised to update-groups:
>      10
>   2914 701 668
>     128.241.219.33 from 128.241.219.33 (129.250.0.39)
>       Origin IGP, metric 11, localpref 10, valid, external, best
>       Community: 2914:420 2914:2000 2914:3000 32354:300
>       Extended Community: Cost:igp:1:10
>   174 701 668
>     204.11.106.1 (metric 11) from 204.11.106.1 (204.11.106.1)
>       Origin IGP, metric 0, localpref 10, valid, internal
>       Community: 174:21000 174:22013 32354:300
>       Extended Community: Cost:igp:1:8
>
> gsr-365-backup#sho ip route 128.241.219.33
> Routing entry for 128.241.219.32/30
>   Known via "connected", distance 0, metric 0 (connected, via interface)
>   Redistributing via bgp 32354
>   Advertised by bgp 32354 route-map point-to-point
>   Routing Descriptor Blocks:
>   * directly connected, via GigabitEthernet4/16
>       Route metric is 0, traffic share count is 1
>
> gsr-365-backup#sho ip route 204.11.106.1
> Routing entry for 204.11.106.1/32
>   Known via "ospf 1", distance 110, metric 11, type intra area
>   Last update from 204.11.106.41 on GigabitEthernet5/1, 00:03:19 ago
>   Routing Descriptor Blocks:
>   * 204.11.106.41, from 204.11.106.1, 00:03:19 ago, via GigabitEthernet5/1
>       Route metric is 11, traffic share count is 1
>
> gsr-365-backup#
>
> Peter Kranz
> Founder/CEO - Unwired Ltd
> www.UnwiredLtd.com
> Desk: 510-868-1614 x100
> Mobile: 510-207-0000
> pkranz at unwiredltd.com
>
>
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