There are two primary types of switch fabrics (I dont have the link
bookmarked or else I would provide it, a great read). Blocking, which I
understand as Shared memory, and Non Blocking, in which Each port has its
own memory, and the ability to transfer its contents directly to a
destination port. In low bandwith situations, both will be fine, but under
High load you will want to use a Non-Blocking fabric.
The 2900/3500 Series is shared Memory
The 2948/4000/5000/6000 Series is Non Blocking (not sure about the 5000).
On the same note, as this thread is an extension of the 6500 question about
over-subscription, I would like to point out that the 6500 has two available
backplanes, with a Supervisor 1(A), It will use the 32Gig backplane, however
with a Supervisor 2, It enables the Crossbar fabric (havent found a good low
level summary of this yet) that can handle 256Gig.
Mark
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Deepak Sharma
Sent: Sunday, March 11, 2001 1:04 AM
To: cisco
Subject: **Shared RAM and Backplane
Hi
Is shared memory on the 3500XL switches
(*snip from cisco.com)
Shared-Data Buffer
A key attribute of the Catalyst 3500 XL architecture is its shared-data
buffer, which employs 4-MB of DRAM in its initial deployment. The
shared-buffer architecture optimizes buffer utilization through dynamic
allocation across all ports and by avoiding packet duplication for
multicast or broadcast traffic.
(*end of snip)
same as a backplane on 6000 series switches? (eg 32gb)
are they the same idea, but on different scales?
thanks
Deepak
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