[c-nsp] Upgrade for C2960-48TC with more buffers

[Gert Doering]

Hi,

On Fri, Nov 06, 2009 at 02:24:07PM -0500, Doug Warner wrote:
> We're running into an issue were a pair of gigabit ports in an etherchannel
> are accumulating out-discards.  From my reading here on cisco-nsp, it doesn't
> sound like many people have a solution for this on the same platform.
> 
> We're currently pushing ~500Mbps/50Kpps through this pair of ports in
> etherchannel; should we be seeing these types of problems, and if so, what
> type of hardware would people recommend upgrading to?

We have been told that Force10 gear handles this situation much more
gracefully - more flexible & larger buffers, and (which seems to be 
the key thing) flow control towards the ingress ports.

The smaller cisco switches have no flow control and not enough buffers
to handle somewhat bursty ingress ports.

What we did was to upgrade the 2G ether channel to a 4G ether channel,
which was cheaper than to get a Force10 switch ($$$ :( ) - the 4G channel
terminates on a 6500, which has larger buffers and more brains.

gert

-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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