It is possible that ports are changing from fabric to loop mode because one of the following events has occurred:
- A previously empty switch port has had a loop device, such as a tape drive, connected to it.
- A connected device has had its topology changed from fabric mode to loop mode.
- A fabric device has been removed from the switch port and has been replaced with a loop device.
The above scenarios are all dependant on the switch ports being in auto-sensing mode. If the ports are fixed to a certain topology and one of the above takes place, the switch ports will need to be manually altered to enable the switch to talk to the connected device.
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