A number of statistics are available to view the current overall processing requirements for CFM. Any packet that is counted against the CFM resource is included in the statistics counters. These counters do not include the counting of sub-second CCM, ETH-CFM PDUs that are generated by non-ETH-CFM functions (which includes OAM-PM and SAA) or are filtered by an applicable security configuration.
SAA and OAM-PM use standard CFM PDUs. The reception of these packets are included in the receive statistics. However, these two functions are responsible for launching their own test packets and do not consume ETH-CFM transmission resources.
Per system and per MEP statistics are available with a per OpCode breakdown. Use the show>eth-cfm>statistics command to view the statistics at the system level. Use the show>eth-cfm>mep mep-id domain md-index association ma-index statistics command to view the per MEP statistics. These statistics may be cleared by substituting the clear command for the show command. The clear function only clears the statistics for that function. For example, clearing the system statistics does not clear the individual MEP statistics, each maintain their own unique counters.
All known OpCodes are listed in transmit and receive columns. Different versions for the same OpCode are not distinguished for this display. This does not imply the network element supports all listed functions in the table. Unknown OpCodes are dropped.
It is also possible to view the top ten active MEPs on the system. The term active can be defined as any MEP that is in a no shutdown state. The tools dump eth-cfm top-active-meps command can be used to see the top ten active MEPs on the system. The counts are based from the last time to command was issued with the clear option. MEPs that are in a shutdown state are still terminating packets, but these do not appear on the active list.
These statistics help operators to determine the busiest active MEPs on the system as well a breakdown of per OpCode processing at the system and MEP level.