The fact that the error message includes traceback information is an indication that this is related to a software error. We do not have enough information to say exactly what kind of software error.
Has this error happened before or is this the first time? Does it happen infrequently or does it happen often? What happens when this error is generated? Does the Catalyst 5500 continue to operate or does it crash? Depending on how often it happens and the severity of the result when it happens we would normally think about whether we could just live with the error or if we need to fix it.
With a software error like this fixing the problem would usually involve upgrading the code. But with a switch as old as the Catalyst 5500 I am not sure that a code upgrade is feasible.
If you are running the most recent version of code then there is not an alternative to upgrade code to get a fix. It might be possible that going to an older version of code might prevent the problem (but of course an older version might not work as well and might introduce new problems). If the problem has occurred only once and was not particularly disruptive, then probably the thing to do is to just let it go (and hope it is a long time before it happens again).
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 custome...