Hi Jon, please see inline below:
At 07:23 AM 9/20/2011, Jon Marshall contended:
Thanks Peter
If they do have dbus connectors then why are they not supported with a sup32.
The connection to the dbus is a control path only on 67xx cards,
there is no data path there. 67xx cards always use the fabric for
data plane forwarding. It's just a question of whether the lookup
happens centrally via the dbus or locally via a DFC.
Sup32 does not have any fabric connection, so there would be no way
for traffic ingressing a 67xx card to reach the sup, or for sup
traffic to egress a 67xx front panel port.
I thought it was a physical connectivity issue but apparently not.
So is it just a performance decision made by Cisco
Don't worry, unlike most other things on this list seemingly, there's
not a conspiracy here. :P
Hope that helps,
Tim
?
Jon
> Subject: Re: [c-nsp] 6500 dbus usage
> From: pe...@rathlev.dk
> To: jms....@hotmail.co.uk
> CC: cisco-nsp@puck.nether.net
> Date: Tue, 20 Sep 2011 16:15:38 +0200
>
> On Tue, 2011-09-20 at 14:12 +0100, Jon Marshall wrote:
> > My confusion is when i read on here that when the 67xx modules are
> > running in CFC mode they send a portion of the packet (depending on
> > compact/truncated mode) across the 32Gbps bus to the supervisor for a
> > forwarding decision to be made. But if they don't have connectors to
> > the 32Gbps bus then how do they access it ?
>
> They do have DBus connectors. Even the WS-X6708-10G-3C, even though the
> diagram doesn't show it.
>
>
<http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html#wp9000639>http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html#wp9000639
>
> > As a further question, assuming they do send lookups across the shared
> > bus then having classic linecards using the same bus could have a
> > direct impact on the performance of the 67xx modules ?
>
> AFAIK it will not impact the performance of traffic staying on
> fabric-enabled cards.
>
> (I'm not aware of any changes the Sup2T might introduce here.)
>
> --
> Peter
>
>
_______________________________________________
cisco-nsp mailing list cisco-nsp@puck.nether.net
<https://puck.nether.net/mailman/listinfo/cisco-nsp>https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at
<http://puck.nether.net/pipermail/cisco-nsp/>http://puck.nether.net/pipermail/cisco-nsp/
Tim Stevenson, tstev...@cisco.com
Routing & Switching CCIE #5561
Distinguished Technical Marketing Engineer, Cisco Nexus 7000
Cisco - http://www.cisco.com
IP Phone: 408-526-6759
********************************************************
The contents of this message may be *Cisco Confidential*
and are intended for the specified recipients only.
_______________________________________________
cisco-nsp mailing list cisco-nsp@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/
