[11912] in North American Network Operators' Group
Re: Asymetrical Routing
daemon@ATHENA.MIT.EDU (Vadim Antonov)
Fri Aug 22 16:30:26 1997
Date: Fri, 22 Aug 1997 13:07:33 -0700
From: Vadim Antonov <avg@pluris.com>
To: Peter Kline <pkline@cisco.com>
CC: Jayme Cox <jcox@broder.com>, nanog@merit.edu
Peter Kline wrote:
> but most of all:
>
> - possibly without justification, end users think that Symmetric Routing is
> the "right thing" to do, so therefore Asymmetric Routing is the "wrong
> thing" to do
This is way too soft-spoken.
Asymmetrical routing is a _necessary_ feature of modern
routing architectures.
It is _not_ possible to "decouple" interior routing between
backbones and preserve symmetricity of traffic flows.
(Note that things like injecting IGP metrics into MEDs do
not scale).
In other words, anyone who complains about asymmetricity of
backbone routing simply does not have a clue.
--vadim
