[c-nsp] 6500/BGP/full route tables [even more] confusing...

[Tim Stevenson]

Hi Jeff,

Removing the DFC from a 65xx card & letting the PFC do the work is 
HIGHLY preferable to letting traffic punt for your shortest mask 
prefixes, which are the ones that won't get into the h/w if you blow 
out the FIB TCAM.

In order of preference:
* get an XL DFC, list price on a DFC3CXL is like $15000
* remove the DFC from the card. You can do this easily on a 65xx card 
(note that with 67xx cards you'd need a CFC around to replace it 
with). 65xx without DFC will use the bus to get central lookups by 
the PFC, & will use the fabric for sending data traffic to the egress module.
* just blow out the TCAM randomly and punt to the CPU. This is not 
just "least preferred", it's bordering on "downright insane".

2 cents,
Tim


At 12:05 PM 3/26/2011, Jeff Kell quipped:

>On 3/26/2011 2:32 PM, Jon Lewis wrote:
> > On Sat, 26 Mar 2011, Jeff Kell wrote:
> >> I intended to upgrade this to "something" suitable for full routing
> >> tables, and went for a Sup720/PFC3CXL.  A million routes, right?
> >
> > Not really.  The million routes thing is highly misleading.
>
>It at least "depends on a whole lot of things".  I'll settle for half.
>Just not 192K.
>
> >> Received another WS-X6516-GBIC but with a DFC3A.  Powers up, but
> >> switches everything to "PFC3A" mode [192K routes]:
> >
> > If you're not doing that much traffic, is removing the DFC from the
> > WS-X6516-GBIC an option?
>
>I don't know, that's why I'm asking, but if that's a viable option, will
>certainly give it a try.
>
>Jeff
>_______________________________________________
>cisco-nsp mailing list  cisco-nsp at 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, tstevens at 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.