Symptom

show hardware capacity forwarding | beg met Feature Used %Used Free Total mcast-groups ---------------------------------------------------- UFIB ECMP 48 0.14 32720 32768 FCFIB ECMP 0 0.00 32720 32768 MFIB MET 31549 192.55 -15165 16384 28 MFIB MET showing more than 100% utilization.

Conditions

customer had intermittent multicast packet drops in their network. After troubleshooting it was found that FIB TCAM and MET table were being exhausted. %IPFIB-SLOT3-4-CLP_FIB_MCASTMET_EXHAUSTED: Met entry allocation from multicast region failed on instance 3 VDC2 %L2MCAST-SLOT3-2-L2MCAST_MAC_FULL_LC: Failed to insert entry in MAC table for FE 3 swidx 332 (0x14c) with err (mac table full). After fixing the issue, no more logs were seen regarding met table exhaustion. But met utilization still shows wrong numbers. However, "sh system internal forwarding multicast met utilization" output shows the proper output: MET usage statistics for Instance 1 Total entries Total Used %Used Free %Free Blk-Used Mgroup ----------------------------------------------------------------------------------------- 16384 204 1.24 16180 98.75 15 24

Workaround

Can use "show system internal forwarding multicast met utilization" on LC to obtain the same information.

Further Problem Description