Cisco 3750 - two ports stopped passing traffic
Posted on 2013-01-28
I have a 3750 switch - two member stack - that has been up for four years. It runs C3750-ADVIPSERVICESK9-M, Version 12.2(46)SE. It's run flawlessly until the last few weeks. Interface Gi1/0/6 stopped sending/receiving traffic although it was in up/up mode. I tried to admin down/up the int but no good. So I moved the cable to another interface (say 1/30) and the traffic flowed again. Over the weekend interface Gi1/0/5 had the same symptom. The host connected to it - a Cisco UCM stopped responding to ping or anything else although the port was up/up. There were no errors visible when I tried "show log" and no incrementing errors on the interface, nothing in syslog. I could even see the bps in and out appear to show some traffic. But from a ping or TCP standpoint the interface was passing no traffic. I bounced the UCM and still no traffic flowed. I moved the cable to interface Gi 1/0/15 and now traffic was flowing again.
I wanted to get some thoughts on here before opening a TAC case. Does this sound like a memory leak bug with this version of IOS? A failing ASIC? Other thoughts on troubleshooting or possible explanation? Thank you.