Tim Thanks, that makes sense now :-) Jon
> Date: Tue, 20 Sep 2011 08:27:12 -0700 > To: jms....@hotmail.co.uk; pe...@rathlev.dk > From: tstev...@cisco.com > Subject: Re: [c-nsp] 6500 dbus usage > CC: cisco-nsp@puck.nether.net > > 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/
