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Thread Index Re: [isp-bgp] How to properly utilize backup link in multi-homed setup?
On (10/12/04 14:03), Colo Host wrote:
>
> Inbound is no problem, we're sending a local priority 90 community to
> Level 3 on our backup link to them so that any traffic coming in from
> them uses the primary link.
[cut]
> This is where my problem arises. We don't have a "backup provider"
> per se, we have two providers, Level 3 and Global Crossing, terminated
> on router #1 and then we have a backup link to Level 3 terminated on
> router #2, same AS.
you want to use global crossing as your backup though right? first
choice is your primary level3 link, second choice is your backup level3
link, and last choice is gblx link...this is what i understand you are
wanting.
easiest way (imho) is to use local-pref...set local-pref on ingress on
the primary level3 link (say 110), your backup level3 link you can
set the local-pref to 105, or leave it at default (100), and then on your
gblx link, set the local-pref to 90. this will have the effect of
preferring the level3 routes above the others, and will be carried via
ibgp between your routers
(rtr-1)
router bgp $your_asn
neighbor $primary_level3 local-pref 110
neighbor $gblx local-pref 90
(rtr-2)
router bgp $your_asn
neighbor $backup_level3 local-pref 105
to me, this is much more simple than using route maps and setting
metrics, ymmv
hth
/joshua
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