[59500] in North American Network Operators' Group
RE: Newbie network upgrade question, apologies in advance to NANOG
daemon@ATHENA.MIT.EDU (Andy Dills)
Wed Jul 2 16:54:15 2003
Date: Wed, 2 Jul 2003 16:53:38 -0400 (EDT)
From: Andy Dills <andy@xecu.net>
To: Vandy Hamidi <vandy.hamidi@markettools.com>
Cc: prue <prue@usc.edu>, <nanog@merit.edu>
In-Reply-To: <954078445C6E8043B458D0C72B12C7F3F26684@mvmail01.markettools.com>
Errors-To: owner-nanog-outgoing@merit.edu
On Wed, 2 Jul 2003, Vandy Hamidi wrote:
>
> I would agree only under certain limited situations. Per packet load
> balancing COULD increase jitter, and if you're running VOIP (or similar
> protocols) could degrade performance. It could also affect TCP
> performance (on OSes not SACK enabled) as well. This would only really
> happen if you're T1's are near capacity (~above 80% or so). Near when
> queues start causing noticeable delays.
>
> If were talking about 2 identically configured T1's, on the same router,
> through the same loop provider, connected to one ISP--I highly doubt a
> situation where packet reordering would arise. It's not impossible, but
> unlikely as all the circuits would be utilized the same, thus queue
> delays should be similar across the board.
>
> I've done this on a private network with 4 T1's and never had a problem.
> We were pushing 100GB database dumps across it and performance did
> quadruple over the single T1.
Yes, but the original poster was dealing with DS3s connected to different
NAPs, which is why the packet out-of-order issue can be significant.
Andy
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Andy Dills
Xecunet, Inc.
www.xecu.net
301-682-9972
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