[c-nsp] Cat7600/Sup720 and IPv4 vs IPv6 performance

Mikael Abrahamsson swmike at swm.pp.se
Thu May 7 18:16:44 EDT 2009

On Thu, 7 May 2009, Rick Ernst wrote:

> I can't find information on how the routing/capacity is partitioned.  If I
> run IPv6 are my combined IPv4 and IPv6 table limited to 500K routes?  Can

These are the defaults:

#sh mls cef maximum-routes
FIB TCAM maximum routes :
Current :-
  IPv4 + MPLS         - 512k (default)
  IPv6 + IP Multicast - 256k (default)

> I carve out the memory so I can support a combination like 500K IPv4
> routes and 250K IPv6 routes?  Will the platform mix and match v4 and v6 in
> the same chunk of memory?  Same/similar question for a combined IPv4/IPv6
> platform; if I run both protocols is the aggregate traffic limited by the
> IPv6 specs?

No, you can change this, you have 1M total to play with, this is 
partitioned between L2, L3 (IPv4/v6/MPLS etc).

Mikael Abrahamsson    email: swmike at swm.pp.se

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