[98736] in North American Network Operators' Group
RE: Extreme congestion (was Re: inter-domain link recovery)
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Thu Aug 16 13:46:47 2007
Date: Thu, 16 Aug 2007 18:29:19 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: nanog@merit.edu
In-Reply-To: <D03E4899F2FB3D4C8464E8C76B3B68B0DBB75B@E03MVC4-UKBR.domain1.systemhost.net>
Errors-To: owner-nanog@merit.edu
On Thu, 16 Aug 2007, michael.dillon@bt.com wrote:
> How many people have noticed that when you replace a circuit with a
> higher capacity one, the traffic on the new circuit is suddenly greater
> than 100% of the old one. Obviously this doesn't happen all the time,
> such as when you have a 40% threshold for initiating a circuit upgrade,
> but if you do your upgrades when they are 80% or 90% full, this does
> happen.
I'd say this might happen on links connected to devices with small buffers
such as with a 7600 with lan cards, foundry device or alike. If you look
at the same behaviour of a deep packet buffer device such as juniper or
cisco GSR/CRS-1 the behaviour you're describing doesn't exist (at least
not that I have noticed).
--
Mikael Abrahamsson email: swmike@swm.pp.se
