Today morning I faced a issue with one of the module in 4500 switch. Many interfaces were down. LAn cable was perfect when tested. However when I changed speed and duplex manualy to 100/full all these interfaces came up. The problem was in only one module ( 3/X) .
Only error I observed in log was for couple of interfaces " May 24 08:28:08.958: %C4K_SWITCHMANAGER-4-S2WERRORREPORT: (Suppressed 9 times)PimEthAutoNeg: S2w Read/Write Error for port Fa3/34."
Module with issues is : WS-X4148-RJ45V "
Can any one suggest route cause of this issue.