[50286] in North American Network Operators' Group
Re: IGP metrics on WAN links
daemon@ATHENA.MIT.EDU (Jennifer Rexford)
Wed Jul 24 15:09:46 2002
Date: Wed, 24 Jul 2002 15:09:02 -0400 (EDT)
From: Jennifer Rexford <jrex@research.att.com>
To: tomhol@corp.earthlink.net
Cc: nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
> Just curious as to what people are using for metrics in their IGP
> and what their reasons are; bandwidth? geographical distance? latency?
We have a survey paper on techniques for setting IGP weights
http://www.research.att.com/~jrex/papers/ieeecomm02.ps
http://www.research.att.com/~jrex/papers/ieeecomm02.pdf
and a longer version
http://www.research.att.com/~jrex/papers/ieeecomm02.long.ps
http://www.research.att.com/~jrex/papers/ieeecomm02.long.pdf
that might be of interest. We discuss how to tune the IGP weights
in a systematic, automated fashion based on measurement data (of
topology and traffic) and an optimization algorithm, and show that
good weights settings allow IGPs like OSPF and IS-IS to perform almost
as well as optimal routing schemes that have complete flexibility in
selecting paths for the traffic.
-- Jen
