From: Jongsoo.Kim@Intelsat.com
Date: Thu Mar 17 2005 - 16:04:11 GMT-3
Nenad
First of all, I don't know full topology of your network.
But this is what I do.
I will do two ebgp session between your ebgp peer and 1)the one you have now
and 2)the new next-hop-router.
And then I will increase local-preference of annoucement from the new
next-hop-router.
Regards
Jongsoo
-----Original Message-----
From: nenad pudar [mailto:nenad.pudar@gmail.com]
Sent: Thursday, 17 March, 2005 11:16 AM
To: ccielab@groupstudy.com
Subject: Complex real-life BGP problem
Hi
I want to change the bgp next-hop from being the router receiving some
routes through EBGP (policy will apply to selcted routes) to be the
other router in network (many hops away)
This is for purpose of traffic balancing.
The problem with this that if the new next-hop-router goes down I will
be blackholing the selected routes from the router in question.
So am looking for for some kind of policy that will change next-hop
only if the new-next-hop router is up.
Simplified config looks like this
route-map NEXT-HOP PERMIT 10
match as-path 33------ selected routes
set ip next-hope NEW ROUTER
route-map NEXT-HOP PERMIT 20
neighbor backbone route-map NEXT-HOP out
The only option I see so far is to use something like this
set ip next-hop ADDRESS1 ADDRESS2
Now according to some Cisco documents if ADDRESS1 is unreachible it
will use ADDRESS2
BUT IT DOES NOT SEEM TO BE WORKING
EVEN IF ADDRESS1 GETS UNREACHEBLE all routers continue to have this
address as next-hop marked with unaccessible.
If anybody already tried to do this or know for some option I will
appreciate help
thanks
nenad
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