[c-nsp] ASIC to switch port mapping

[Vincent Aniello]

Any recommendations on a switch with larger buffers?  I would like to
stick with the 1U form factor.  

Also, are you saying that the microbursts cause the switch to exceed 1Gb
port speed which causes the drops?  Cisco claims that the
WS-C3560E-24TD-E switch has a 128-Gbps wire rate non-blocking switching
fabric capacity.  I may be oversimplifying this, but to me, Cisco's
claim implies that I should be able to run every port on this switch
simultaneously at a full 1Gb in both directions.

Thanks.

--Vincent

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nick Hilliard
Sent: Friday, September 10, 2010 4:11 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] ASIC to switch port mapping

On 10/09/2010 18:40, Vincent Aniello wrote:
> Unless there is only a single ASIC in a 3560E switch I do not believe 
> this command returns the ASICs associated with each port.  Here is the

> output on my switch:

oh, 3650. hmmm.

Unfortunately, these switches have very small buffers indeed.  If you
microburst above what their buffers can handle, then yes - you will drop
packets.

I'd suggest that you check your outbound port usage.  If there are any
ports which are consistently or inconsistently high, or if you're seeing
any ports with buffer drops, that you upgrade those connections.
Alternatively, get a switch with larger per-port buffers.

Nick
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