Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

MLSM-7-SC_TCAM_FULL_ERROR:

Hi

I have been getting this error on a cat6506 with sup2 and IOS version c6sup22-psv-mz.121-20.E3.bin

MLSM-7-SC_TCAM_FULL_ERROR: TCAM space not available to install the (x.x.x.x,x.x.x.x) entry in the Hardware

I have been having real trouble with resolving it. Output interpriter suggests reconfiguring the box to avoid this problem, but I don't know what configuration is actually required for it.

Any ideas anyone?

10 REPLIES
New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

This means that your TCAM reached its maximum capacity.It is not an issue.It is a notification that you have exceeded the maximum number of multicast entries that can be hardware forwarded.Any further entry will be software forwaded.But please note that software forwarding is cpu intensive and relatively slow.

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

Please also check this.

http://www.cisco.com/en/US/products/hw/switches/ps708/products_system_message_guide_chapter09186a008007d2a2.html#wp1043631

Error Message MLSM-7-SC_TCAM_FULL_ERROR: TCAM space not available to install the

([IP_address],[IP_address]) entry in the Hardware

Explanation This message indicates that a (s,g) or (*,g) entry could not be installed in the hardware-CEF table. The system is running out of available CEF entries.

Recommended Action Modify the network config so that the hardware resource limitation is not reached, and ensure that the (s,g) or (*,g) entry is installed.

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

Thank you for the reply. In fact I have seen the output interpriter suggestion (I mentioned it in my first post) but I don't know how to modify the network config so that the hardware resource limitation is not reached.

Also the ip address in the error has a mask of 239.x.x.x which is a limited-scope address. This is the only entry we have been getting the alert for. I am not sure how relevant the address scope is to this issue.

If however this is only a cosmetic issue as you suggested, I will be more then happy to leave it at that.

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

Victor, it is NOT a cosmetic issue.every additional entry that is software swicthed increases the cpu load.

please check if you can reduce the number of multicast groups/entries used so that it can fit into the max limit.

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

Aha! Thank you for that one - will try and see if it helps. If it does - I will let you know.

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

I am not quite sure how to reduce the number of multicast groups on this box. In fact I have had a good look and there is not much multicast configuration on it at all. And only one entry in mrout table.

So I am really confused now.

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

Hi victor,if you see the messages popping up even if you have just one mroute entry, that is abnormal.But if you see one or two messages in the logging, and you do not see any messages at that point of time, it implies that tcam capacity exceeded in the recent past.It means your network load is more than what this particular box can handle and upgrading your sup to sup720 will be the best solution.

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

Hi

I get this error on average once a day. Always for the same S,G entry.

I do agree that upgrading the sup would be the best solution.

Thank you.

Bronze

Re: MLSM-7-SC_TCAM_FULL_ERROR:

You could use this error to start the justification of getting a SUP720 ;)

New Member

Re: MLSM-7-SC_TCAM_FULL_ERROR:

And a new IOS too :)

588
Views
7
Helpful
10
Replies