I am experiencing a weird problem concerning heavy loss of packets and CRC errors.
I have a 2811 router connected to a 3560 switch. the connection is a standard staright cable connected between the fastethernet of the router and the gigabitethernet on the switch.
The speed and duplex settings on both sides were set to "auto" and was working fine.
Suddenly, the uplink on the router side started generating CRC errors which made users connected to the switch suffer connectivity issues. Even hard-coding the speed/duplex on both sides still doesn't solve it.
I used to get duplex error messages, I don't anymore but the problem remains
I tried all possible settings, even changed the cable, switch then even changing the router itself.
When I open a ping session from the HQ router to the remote site router's LAN interface, there is a huge loss of packets, same thing happens when pinging the switch's uplink interface.
The problem is solved momentarily by connecting both ends of the uplink to fastethernet ports.
However, I am not sure of the cause given that the exact configuration/IOS/Hardware model exists and continues to operate fine at other remote sites.
I need to know what caused this sudden loss of service.
which hardware is faulty or is it a software problem although
Your response is highly appreciated.