Monitoring and troubleshooting an interface in CATOS

For CatOS, the show mac command displays the MAC counters for traffic passing through each port such as, received frames, transmit frames, out-lost, in-lost, etc. (This command does not list the MAC addresses learned on a port by the bridging software. Use the command show cam dynamic for that information.)

For Cisco IOS, the show interfaces card-type x/y counters command is similar to show mac for CatOS platforms. show counters mod/port is also useful.