[73816] in North American Network Operators' Group
Re: RIPE "Golden Networks" Document ID - 229/210/178
daemon@ATHENA.MIT.EDU (Bill Woodcock)
Sat Sep 4 15:39:56 2004
Date: Sat, 4 Sep 2004 12:34:01 -0700 (PDT)
From: Bill Woodcock <woody@pch.net>
To: Alex Bligh <alex@alex.org.uk>
Cc: NANOG <nanog@merit.edu>
In-Reply-To: <DCCFB49071C9955936770078@[192.168.100.25]>
Errors-To: owner-nanog-outgoing@merit.edu
On Sat, 4 Sep 2004, Alex Bligh wrote:
> if in a heavily plural anycast domain prefix route changes are more
> common than "normal" routes (albeit without - dampening aside -
> affecting reachability), does this mean route dampening
> disproportionately harms such routes?
This would be an argument in favor of either asking peers to tag
anycast-learned routes no-export, as F-root does, or using anycast
prefixes which are short enough that they won't make it through many
people's filters, and advertising the aggregate from your tunnel-hub
(which is presumed to be stable), as we do.
I suspect that a stand-alone prefix, advertised with equal mask length
from all instances, without no-export, would be relatively more vulnerable
to dampening, as Alex suggests. Topologically, it appears little
different than a massively peered or massively multi-homed network of
any other sort, as the papers Randy is citing describe.
-Bill
