Symptom

The interface report Xmit-Err and IntMacTx-Er errors with default cut-through switching mode. There are no input/CRC errors on any ingress interfaces, the input/CRC errors are generated between the internal LC-FM link and reported as stomped CRC errors on the egress module which are getting forwarded due to cut-through switching mode. N9508# sh int e1/1 co errors -------------------------------------------------------------------------------- Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards -------------------------------------------------------------------------------- Eth1/1 0 0 419 0 0 0 -------------------------------------------------------------------------------- Port Single-Col Multi-Col Late-Col Exces-Col Carri-Sen Runts -------------------------------------------------------------------------------- Eth1/1 0 0 0 0 0 0 -------------------------------------------------------------------------------- Port Giants SQETest-Err Deferred-Tx IntMacTx-Er IntMacRx-Er Symbol-Err -------------------------------------------------------------------------------- Eth1/1 0 -- 0 419 0 0

Conditions

None

Workaround

A reload of the FM generated input/CRC errors fixes the problem Open a TAC case to narrow down the FM module generating the input/CRC errors

Further Problem Description