FW: Getting pretty close to default IPv4 route maximum for 6500/7600routers.

Jon Lewis jlewis at lewis.org
Fri Jun 13 14:54:32 UTC 2014

On Mon, 9 Jun 2014, John van Oppen wrote:

> It is generally much better to do the following:
> mls cef maximum-routes ipv6 90
> mls cef maximum-routes ip-multicast 1
> This will leave v4 and mpls in one big pool, puts v6 to something useful for quite a while and steals all of the multicast space which is not really used on most deployments.
> This gives us the following (which is pretty great for IP backbone purposes in dual stack):
> #show mls cef maximum-routes
> FIB TCAM maximum routes :
> =======================
> Current :-
> -------
> IPv4 + MPLS         - 832k (default)
> IPv6                - 90k
> IP multicast        - 1k

I was just looking at / thinking about this again, and though I don't 
disagree that doing the split your way is probably better, I think it's a 
moot point.  I strongly suspect these boxes will run out of RAM before 
they're able to utilize another 256k routing slots with multiple full v4 

  Jon Lewis, MCP :)           |  I route
                              |  therefore you are
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________

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