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A VLAN might disappear due to a duplex mismatch, which causes connectivity issues

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Core issue

When multiple ports are configured to have duplex mismatch with the peer, and under heavy broadcast or multicast traffic, the VLANs disappear after a period of time.

This problem is not seen if the duplex mismatch condition is corrected after 15-20 minutes.

This is a mis-configuration issue, not a software issue.

Resolution

There is no workaround. Correct the duplex mis-match problem.

This issue is documented in Cisco bug ID CSCed08716.