I suddenly lost communication between server and cat 6509 (catos) switch.
Nothing on the switch indicated failure.
I ran show port 9/13 and it showed as connected. Interface on the server was up. I could see TX number on a switch going up but not RX. What is even more weird is when I ran tcpdump on the server, i saw CDP info going to the server, but notghing else. Usually i see other stuff like spanning tree messages or HSRP.
I then plugged in the server to the other switch port using the same GBIC, the same cable and it worked. So it had to be port on a switch that failed. Any ideas why the port did not show as down?
When the device connected on one port stops communicating and it starts talking and connecting after it was moved to another port the switch is usually blamed since the device started to work on another port. However, when you disconnect that device/host it is equivalent to bouncing the port. Have you tried bouncing the original port? If you put it back in original port it would probably work. You stated that the port is transmitting but not receiving, switch usually does not control the RX end. It can alos be due to asic issue, have you checked the asic register's errcounters? I can send you a command to check those but I need to know what kind of line card. Then finally, as last resort to find true root cuase is to sniff the port, it's simple to sniff it by simply pinging from a device in the same subnet as that device, you should see confirm whether the switch is sending the packet and if the device is actually responding. If the switch is sending and the device is not responding, it would be hard to argue that it's a switch issue.
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