I have a Cisco 2821 with a Etherswitch WIC connected to an ISP router and a network switch and for a couple of days now the WIC dropped it's connection to the LAN. Reloading the router solves the issue until the next day. I checked the logging on the router and nothing. I was able to ping the virtual interface on the router while directly connected via the console. All virtual and physical interfaces were up. However, I wasn't able to ping anything on the local network. There were no crash logs on the server. How can I troubleshoot this issue?
The only explanation I had is that I had the WIC interface connected to a gigabit port. Would that cause problems--connecting a 10/100 WIC to a Gigabit port on another switch???
On the interface in question, it is running half duplex which is why you are seeing the collisions you will need to correct this and you collisions should go away. make sure both ends are setup the same way as this could also be a duplex mismatch.