IPv6 and sdm-prefer

[pthomsett]

We run a num ber of Catalyst 3560x switches with IP advanced services...

They are currently set for sdm-prefer routing which gives 8K a possible IPv4 routes, howvere the switch has about 2400 routes in the routing table..

We are about to enable IPv6 on the switch to support just a small number of IPv6 addresses (less than 50), according to the documentation enabling the ipv4-ipv6 sdm-prefer drops the number of IPv4 routes down to 1.5K..

My question is the documentation says that the figures are approximate rather than absolute maximums, as we are only going to have a small number of IPv6 routes, will we likely be able to have many more IPv4 routes that the 1.5K specified..?

Thanks

Paul

[Joseph W. Doherty]

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Posting

You could check your current TCAM utilization for your routing entries.

Enabling these series switches for IPv6 routing does dramatically reduce IPv4 TCAM resources.  BTW, later IOS images, I believe I recall, offer a 2nd IPv6 template.