[c-nsp] FYI regarding Cisco 12000 GSR Engine 3 ISE IPv6 tcam carving

Mikael Abrahamsson swmike at swm.pp.se
Thu Feb 7 02:53:08 EST 2013

Hello. I'm posting this here so it'll be searchable for future use.

4 port 1GE SFP card for Cisco 12000 running IOS only supports around 4k 
IPv6 routes, then a message is displayed:

It was discussed in 
before, but there is a twist. If the tcam regions doesn't add up to 100%, 
no carving is done. This was verified with 12.0(33)S10. Also 
discusses this.

So with "show controllers ise <slot> tcam", the output MUST say:

"Total Tcam size = 100%"

If it says < 100% or > 100%, no carving is done. I cannot find any error 
message about this, so I thought I'd create this post so others might find 
it in the future.


show controllers ise <slot> tcam
exec slot <slot> show controllers tofab alpha tcam carve

Mikael Abrahamsson    email: swmike at swm.pp.se

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