We have a 6509 which is generating vlanTrunkPortDynamicStatus trap messages at irregular intervals (around 1 per day). The first trap shows the interface has changed to 'noTrunking' followed by another trap 6 seconds later with the status of 'trunking'.
The link it refers to is a alternate spanning-tree port. There are no corresponding messages in the log. Show interface shows no input/output errors.
Some days ago UDLD on the peer device set the state of its corresponding interface to err-disabled as it detected a receive/transmit loop. These traps have been sent prior to this and have continued after a shut/no shut was performed on the interface.
Any suggestions would be appreciated.