[c-nsp] "show platform hardware capacity" shows sup720-3b FIB tableat 98%

[Peter Kranz]

http://www.cidr-report.org/cgi-bin/plota?file=%2Fvar%2Fdata%2Fbgp%2Fas4637%2
Fbgp-active.txt&descr=Active+BGP+entries+%28FIB%29&ylabel=Active+BGP+entries
+%28FIB%29&range=Year&StartDate=&EndDate=&yrange=Auto&ymin=&ymax=&Width=1&He
ight=1&with=Step&color=auto&logscale=linear

Sorry for that link.. but the jist of it is that the global IPv4 routing
table grew from 160k routes 12 months ago to 190k routes today. So 30k
routes/year.. Which means in sometime around 12-18 months from now the
sup720-3b will not handle IPv4 full routes.

Peter Kranz
Founder/CEO - Unwired Ltd
www.UnwiredLtd.com
Desk: 510-868-1614 x100
Mobile: 510-207-0000
pkranz at unwiredltd.com

-----Original Message-----
From: Tim Stevenson [mailto:tstevens at cisco.com] 
Sent: Friday, July 21, 2006 11:23 AM
To: sthaug at nethelp.no; pkranz at unwiredltd.com
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] "show platform hardware capacity" shows sup720-3b FIB
tableat 98%

This is correct - it has to do with a limitation of the specific TCAM 
memory used in PFC3B/BXL which requires that the entries used for 144 
bit routes (v6 & multicast) be allocated in blocks of 16K 72-bit 
entries (=8K 144 bit entries).

I would think 239K is adequate for the forseeable future for IPv4 
routes, but would like to be enlightened if that's not the case 
(flame-proof suit donned).

Not sure if it was mentioned elsewhere in this thread, but be aware 
that changing the max-routes config does require a system reboot...

Tim


At 07:23 PM 7/21/2006 +0200, sthaug at nethelp.no exclaimed:
> > I've been told that the 256k route limit on the 3b was bogus, would be
> > interested in any feedback on that, since if it's a real limit it makes
the
> > 3b a no go for anyone getting full routes now.
>
>It's very real. And it's not really 256K either - "mls cef maximum-routes"
>won't let you set number of IP routes higher than 239K. From one of our
>Sup3B boxes:
>
>xxxxx#show mls cef maximum-routes
>FIB TCAM maximum routes :
>=======================
>Current :-
>-------
>  IPv4                - 239k
>  MPLS                - 1k
>  IPv6 + IP Multicast - 8k (default)
>
>It's even documented:
>
>http://www.cisco.com/en/US/products/hw/routers/ps368/products_command_refer
ence_chapter09186a008020276e.html#wp1656955
>
>So you'd better upgrade to 3BXL before you hit that 239K ceiling.
>
>Steinar Haug, Nethelp consulting, sthaug at nethelp.no
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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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