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

[Tim Stevenson]

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_reference_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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