We have a Cisco 3650 switch with a flat vlan that is linked to another Extreme switch via a fiber whip and mini-gbic. When I got to the office it appeared that the gbic on the Cisco switch had died and when I replaced the gbic the link came back up. Well when it appeared to be fine again I noticed we started losing connectivy to a couple servers, one being a VM on a Hyper-V server. You could get to the Hyper-V but not the guest. odd. Anyway it started to progress and then it was a handful of servers that could not communicate. I immidiately unplugged the uplink and the problem was still there. We traced the issue down to 2 ports that seemed to be bad. For example - When we hung a workstation off the port to test we could hit a some addresses of servers on the switch and others we couldn't. Very inconsistant. Since the issue yesterday I have left the other switch unplugged and we are not using the 2 (so called) bad ports.
What I am trying to find out is if there is a correlation between the port that failed and the issues I had with the intermittent connectivity with just SOME of the ports and VM's on the switch. I can explain this a little deeper if needed but was wondering if this may hit a nerve with someone who has had a similar experience.
Again seemed to be when I plugged the switch back in that the problems started to creep in. It wasn't all at once but progressive. Even after I unplugged the uplink the problem was still there.