[c-nsp] Cisco Switch Packet Buffering Matrix?

Mon May 24 11:03:32 EDT 2010

Imho, one should not encourage this nonsense by signing any such NDA. Brocade, juniper, extreme, and others publish such data about their products right on their darn respective websites, and without demonstrable harm.

Knowing if something has a shared+per-port limit vs per-port-asic vs per-port mac/asic buffering arch is inconsequential, and represents no competitive disadvantage--unless the (advantage?) purpose is, in fact, to obscure details.

As for getting this data from the hardware itself, poke around MQC and MLS qos show commands, and attempt to configure mls/mqc QoS policies. These features usually will indicate what their "maxiums" are on the platforms in question, while you're configuring them.

-Tk

-----Original Message-----
From: "Arie Vayner (avayner)" <avayner at cisco.com>
Date: Mon, 24 May 2010 16:47:38 
To: Skeeve Stevens<Skeeve at eintellego.net>; <cisco-nsp at puck.nether.net>
Subject: Re: [c-nsp] Cisco Switch Packet Buffering Matrix?

Skeeve,

If you want to get this info in the "right" way, then the best approach
would be to talk to your local Cisco account team...
Some of the info may require NDA etc.

On the same point, you may want to also look at 4948E and Nexus5000
switches, which could give you better latency performance, which is
important for storage-related applications.

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Skeeve Stevens
Sent: Monday, May 24, 2010 16:04
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Cisco Switch Packet Buffering Matrix?

I don't think this email got through the other day... I didn't see it
appear.

...Skeeve

From: Skeeve Stevens
Sent: Tuesday, 11 May 2010 10:27 PM
To: cisco-nsp at puck.nether.net
Subject: Cisco Switch Packet Buffering Matrix?

Hey all,

I am doing some iSCSI implementations are the moment and are looking at
which switch models are best for different iSCSI rollouts we're doing.

I am wanting to know which 29xx and 35xx/37xx series switches have the
following:

-          Size of packet buffering per model

-          If the PB is per port or shared

-          Is there one or more classes of PB classification

-          If the PB is shared, is it per switching module (i.e. 8/12
port block) or across the entire switch

-          If the 10GB model is plugged in, does it have its own PB, or
does it share the main boards?

I looked in the Portable Product Sheet -
http://www.cisco.com/web/partners/tools/quickreference/index.html  but
found nothing, and Google and Cisco.com proved useless.  Maybe there is
a reason for this, or my searchfoo is weak.

...Skeeve

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