[c-nsp] GigE cards for 6509

[Tim Stevenson]

You can stay in compact mode in a system with a fabric (thus not affecting 
system performance), and you get dedicated bandwidth to the card rather 
than sharing the backplane bus with other cards.

Tim

At 05:40 AM 10/15/2004, cisco-nsp-request at puck.nether.net mumbled:
>Message: 5
>Date: Fri, 15 Oct 2004 07:48:11 +0100
>From: "Ryan O'Connell" <ryan at complicity.co.uk>
>Subject: Re: [c-nsp] GigE cards for 6509
>To: Tim Stevenson <tstevens at cisco.com>
>Cc: cisco-nsp at puck.nether.net
>Message-ID: <416F72AB.9080500 at complicity.co.uk>
>Content-Type: text/plain; charset=us-ascii; format=flowed
>
>On 15/10/2004 03:57, Tim Stevenson wrote:
>
> > Yikes! Lots of misunderstandings here folks!
> >
> > Clarifying the architecture of 6148-GETX first of all. It is a classic
> > card, no fabric - so the 8G is not correct, you are perhaps thinking
> > of the fabric enabled (6548-GETX) version.
> >
> > However, both 6148-GETX & 6548-GETX are 8:1 oversubscribed, which
> > means you will NEVER get more than 6G out of these cards. There are 2
> > backplane interface ASICs, which are each 4x1G chips, but only 3x1G is
> > used on each. Each 1G port on these chips connects to another ASIC (a
> > mux so to speak) servicing 8 front panel ports. So 8 front panel ports
> > share 1G of bandwidth, and there are 6 groups of 8 ports (contiguous,
> > so 1-8, 9-16, etc).
>
>
>So despite being a CEF256 card, the 6548-GE-TX can still only manage
>6Gb/s? If so, what's the advantage of using a 6548 over a 6148?



Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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