[isp-bgp] How to properly utilize backup link in multi-homed setup?

["Colo Host" <ispcolohost@...>]

Hello all, I'm hoping someone could give me a suggestion on how
to only make use of a backup link when the primary is down.  The
setup is two border routers, router #1 and router #2.  #1 has
connectivity to Level 3 (ASN 3356) and Global Crossing (ASN 3549).
We've just added router #2 and it has a link to Level 3 (ASN 3356)
which is to only be used if the primary link to them were to fail and
will soon have a third provider brought on.

I don't think setting local preference lower on the backup link will
work because I believe local preference is not AS-specific and
would cause all outbound traffic to prefer Global Crossing on router
#1 if the primary Level 3 link were to fail since it would have a
higher local preference than the backup Level 3 link.  I'm thinking
I could get Level 3 to send me MEDs to prefer the primary link
but is there any other way I can force it myself on my side?

Thanks,

Dave







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