North American Network Operators Group

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Re: NAP/ISP Saturation WAS: Re: Exchanges that matter...

  • From: David Schwartz
  • Date: Tue Dec 17 14:38:21 1996

	I'm quite curious how they handle full-duplex FDDI where 
witholding the token doesn't seem to be an option. Do they simply drop 
packets when traffic gets bursty?

	Ironically, I'd prefer they drop the packet bound for a busy port
rather than stop all incoming traffic from a port until the busy port

	If anyone has experience with NetStar's GigaRouters, especially 
in comparison to the GigaSwitches, I'd love to hear about it. You can 
reach me at [email protected]


On Tue, 17 Dec 1996, Dennis Ferguson wrote:

> > My (admittedly second hand) understanding is that the Gigaswitch/FDDI
> > actually has minimal amounts of buffering.  During a congestion event, it
> > simply withholds the token, resulting in buffering in the routers.  Queues
> > there eventually overflow, and ...
> This matches my understanding, though I think it understates the problem.
> Gigaswitches are essentially input-queued.  When their teeny tiny buffers
> fill they flow-control everyone to slow them down.  What this means is that
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