The error message means that one of the stack connections is flapping,going up-down constantly.
According with the messages, the connection we are having problems with is the one between switch 1 stacking port 1 and switch 2 stacking port 2. This error message could be caused by a faulty stacking cable or a faulty stacking oort. If possible, I would like you to remove the stacking cable connected on these ports and then clear the log and verify if the message stops. Then, if you had a spare stacking cable,it would be a good idea to try it out.
If you do not have a spare cable, in order to determine if the problem is with the cable or the a stacking port it self, we would need to swap the stacking cables around, and if the error message now points to the other two ports, it would be definitively a problem with the stacking port itself.
Shortly after posting this, I noticed two ports in err-disable mode. I shut these ports down and then observed that the errors suddenly stopped appearing in the logs. I thought I had the problem solved... until an hour later when they started up again. I immediately checked again for ports in err-disable mode but could not find any. Now I was puzzled.
Since the errors did not seem to be affecting the performance of the switch, I decided to leave it for awhile until I heard back from this post if at all. This morning I checked the switch and the errors are nowhere to be found... they must have stopped sometime during the night without any intervention on my part.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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