Re: Catalyst 3550 Switch ports flashing at same time
Best way to determine what is going on is to get a console connection when the problem is occuring and capturing:
show proc cpu >> what is the cpu util?
show spanning summary >> see if the STP root is what it should be.
show log >> look for any clues that will explain the cpu or STP.
show spanning-tree vlan x >> for each vlan.
if possible, disconnect the links one at a time, if you suspect a loop, start with uplinks or link connecting to another switch. Once connectivity is restore as soon as a particular link is severed, note what is connected on that link and reconnect the rest of the link one at a time to verify that the issue is gone. The next step would be to investigate why that particular switch is causing a loop.
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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