There have been a couple instances (on difference 5509 switches) where a
switch port that is being configured as a trunk have fallen out and reverted back to it's native VLAN. When this occurs, the commands to configure the trunk port are no longer on the switch.
This has occurred on a trunk port configured for Dot1q and NONEGOTIATE as
well as a trunk port configured for ISL and ON.
We'd like to know if this is a known issue and if possible the cause.