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Community Member

TCAM capacity

I have the following message each time I change and ACL on a 6500 (WS-F6K-PFC):

"Hardware TCAM entry capacity exceeded ..."

I understand why, but is there a way to upgrade this?

Thanks

3 REPLIES
Cisco Employee

Re: TCAM capacity

TCAM is not upgradable, you need to upgrade the PFC to PFC2 to get more TCAM space.

http://www.cisco.com/warp/customer/473/79.html

Cisco Employee

Re: TCAM capacity

Try changing merge algorithm to ODM and see if it makes any difference. The command is

mls aclmerge algo odm

And then add ACL to interface again

Community Member

Re: TCAM capacity

Now in order to use the merge algorithm, you need to upgrade to 7.x CATOS version. This new algorithm uses the TCAM space efficiently and hence you would be able to fit more acl into it. Remeber the LOU (Layer 4 operators) are still fixed and this algorithm can't provide any benefits. You have to rewrite the ACLs to workaround the problem (for example, instead of using range, you use multiple eq ops )

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