Seeing %MLS-4-FIB_TCAM_FULL:FIB TCAM full

Unanswered Question
Sep 28th, 2009

I have a customer that is seeing the following error message:

%MLS-4-FIB_TCAM_FULL:FIB TCAM full

This message indicates that a new FIB entry could not be installed in the hardware FIB TCAM table because the table is full. As a result, any packets that encounter a hardware FIB lookup miss will be sent to the MSFC for software forwarding.

Recommended Action: This is a hardware restriction. You can reduce the number of routes on the switch by load sharing with other switches or upgrade the supervisor engine to a larger FIB TCAM capacity.

Is there a supervisor card that will have a larger FIB TCAM capacity than a SUP720?

I have this problem too.
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Giuseppe Larosa Mon, 09/28/2009 - 11:29

Hello Richard,

not all sup720 are equal in terms of routing table and TCAM size.

unless you have already a Sup 720 3CXL or sup720 3BXL you should have some margin of improvement.

clearly this can be a sign that you have too many BGP upstream providers on same device for example

see

http://www.cisco.com/en/US/partner/prod/collateral/switches/ps5718/ps9336/product_data_sheet0900aecd806ed759_ps708_Products_Data_Sheet.html

or

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps9336/product_data_sheet0900aecd806ed759_ps708_Products_Data_Sheet.html

and comparison of all sup720 -xx

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet09186a0080159856.html

Also there are the RSP720 processor family for 7600 to be considered

or you need to move to GSR with PRP2 or ASR 1006 but this is a major change.

Hope to help

Giuseppe

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