The line protocol on fastethernet 0/1 of my cisco 2811 refuses to come up. i have enabled the interface wit no shut. i don't know what could be wrong. however the line protocol of Fa0/0 of the same device comes up and is working with the same ethernet cable. i have tried making new cables, they always work with fa0/0 but not fa0/1, i have even replaced the IOS image still no solution. could it be a hardware problem? the show interface indicates interface is up but line protocol is down. help please.