[c-nsp] Late night BGP puzzler

[Metz, E.T. (Eduard)]

If I understand correctly, the cost-community is only considered very
late in the decision process (among others after as-path, med and
e-bgp/i-bgp): 
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009
4431.shtml 

All these should be equal before the cost-community kicks in..

/Eduard

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Manu Chao
> Sent: woensdag 1 augustus 2007 12:38
> To: pkranz at unwiredltd.com
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Late night BGP puzzler
> 
> 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
> >
> >
> > _______________________________________________
> > cisco-nsp mailing list  cisco-nsp at puck.nether.net 
> > https://puck.nether.net/mailman/listinfo/cisco-nsp
> > archive at http://puck.nether.net/pipermail/cisco-nsp/
> >
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net 
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
> 

This e-mail and its contents are subject to the DISCLAIMER at http://www.tno.nl/disclaimer/email.html