Re: [nsp] MSFC2 128,000 route limitation

From: sthaug@nethelp.no
Date: Mon May 20 2002 - 15:58:49 EDT


> The TCAM that holds the FIB table is capable of holding 256,000 entries.
> Without unicast RPF checking turned on the maximum number of unicast
> entries that can be held in the hardware FIB table is 244,000. The
> remaining 12,000 entries are reserved for multicast routes. If unicast RPF
> checking is enabled then the number of routes that are held in the TCAM is
> halved.

Just so I am absolutely certain what happens here: Is the number of routes
that are held in the TCAM simply halved *as soon as unicast RPF checking
is turned on* (even for a single interface) - or are there other config
parameters that are also relevant?

(If it only takes a single "ip verify unicast reverse-path", I guess I'll
be converting our 6500s to use input ACLs instead.)

Steinar Haug, Nethelp consulting, sthaug@nethelp.no



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