Mac address Flapping on Catalyst 3850

[bergonzoni]

Hi all, I have a couple of Catalyst 3850 Switches, if I connect them with a Port-channel I have many Mac address Flapping events and resulting problems on virtual-machines attached to them.

The Port-channel can be of one or more active links but I have the same issue, if I remove this Port-channel and replace it with a single link I don't

have this issue.

In both cases this link between 3850 is correctly blocked by STP.

I suspect that I have a wrong configuration on Switches of Vmware Infrastructure but I don't understand why the single link works and Port-channel doesn't work.

I tried LACP and Static etherchannel but I have the same issue.

Regards

Marco Bergonzoni

[swillet41]

bergonzoni,

I have a simliar issue, but only with a 2960-48port switch.  I am using c2960-lanbasek9-mz.150-2.SE8.bin

Did you ever resolve your issue?

What IOS are you using?

Thanks,

Scott