[c-nsp] Flow tools

[Chuck Church]

So no more PFC falling back to a mode that is common to all the DFCs?


Chuck

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Gert Doering
Sent: Wednesday, January 18, 2012 10:05 AM
To: Nick Hilliard
Cc: Gert Doering; Jon Lewis; Cisco NSP
Subject: Re: [c-nsp] Flow tools

Hi,

On Wed, Jan 18, 2012 at 02:07:51PM +0000, Nick Hilliard wrote:
> On 18/01/2012 13:28, Gert Doering wrote:
> > And, just maybe, "non-compatibility of Sup2T with your existing 
> > stock of line cards".  Like, all bus-based cards, and everything 
> > with a DFC on it.
> 
> Gert, hardware upgrades need to happen; otherwise we would all be 
> stuck using bus interfaces designed in the early 1990s.

I'm aware of that, and we like 67xx cards where they make sense - and use
others like 6408A-GBIC, when we just need 2 or 3 GigE ports in some
location.

[..]
> Re: DFCs, either you have distributed forwarding or you don't.  If you 
> do, you have much greater forwarding capacity.  If you don't, your 
> network will be cheaper to build.  Shifting bits costs money.

Well.  Assume you have lots of existing 67xx cards with DFCs, and these DFCs
have exactly the capacity that you need.  Now you get a Sup2T, and these
DFCs are no longer supported - what exactly does this have to do with "much
greater capacity"?

I can understand that supporting the DFC3s won't work, but it's something to
keep in mind, and something that makes purchasing of a Sup2T more than "it's
the same price than a Sup720-10G".

gert

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