From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Fri Nov 12 2004 - 13:43:51 GMT-3
At 3:17 PM +0000 11/12/04, libone mhlanga wrote:
>Is it possible for BGP to do per-packet load-balancing to two
>different AS numbers ? Put another way does BGP now have the
>ability to install two routes in the routing table to the same
>prefix without preferring one over the other ?
>
>Thanks,
>
>Li
>--
While not in the BGP standard or the almost-approved Draft 26
revision, Cisco and others do have equal cost multipath BGP
extensions. For a variety of operational reasons, it would be very
unwise to load balance a single route across different AS.
Troubleshooting would be a nightmare.
I was at the Interdomain Routing (IDR) Working Group meeting at the
IETF this week, and this was discussed in a proposed standards track
approach to ECMP,
http://www.ietf.org/internet-drafts/draft-bhatia-ecmp-routes-in-bgp-01.txt
There is another proposal that solves a slightly different but
related problem for multiple sessions with multiprotocol BGP,
http://www.ietf.org/internet-drafts/draft-ietf-idr-bgp-multisession-00.txt.
You may find it illuminating to compare and contrast the two
proposals, which are complementary.
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