North American Network Operators Group

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RE: Newbie network upgrade question, apologies in advance to NANOG

  • From: Andy Dills
  • Date: Wed Jul 02 16:55:43 2003

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 Dills
Xecunet, Inc.