[73769] in North American Network Operators' Group
Re: RIPE "Golden Networks" Document ID - 229/210/178
daemon@ATHENA.MIT.EDU (John Bender)
Thu Sep 2 19:09:31 2004
Date: Thu, 2 Sep 2004 16:09:44 -0700
From: John Bender <johnbender@speakeasy.net>
To: Iljitsch van Beijnum <iljitsch@muada.com>
Cc: NANOG <nanog@merit.edu>
In-Reply-To: <A0FC454A-FD2D-11D8-A858-000A95CD987A@muada.com>
Errors-To: owner-nanog-outgoing@merit.edu
On Fri, 3 Sep 2004 00:15:42 +0200
Iljitsch van Beijnum <iljitsch@muada.com> wrote:
> But then again, dampening really doesn't buy you much as it only
> applies to routes that are flapping beyond the link to the next AS. So > if you have an instable link somewhere, you can't dampen that
> instability away yourself.
And this is the point: dampening can actually lead to decreased network stability and non-deterministic behavior. Granted, this behavior is exasperated by not deploying a common dampening policy across all ASes (which is the why RIPE-229 was written).
This would not be as problematic if dampening could be applied to a path rather than a prefix, since an alternate could then be selected. But since this would require modifications to core aspects of BGP (and additional memory and processor requirements) it does not seem a likely solution.
