Avaya P330 Reference Manual page 166

Chapter 2 Avaya P330 Layer 2 CLI Commands
If spanning tree is enabled and is set to rapid-spanning-tree version, there is no
need to use the Self-loop-discovery feature ; the rapid spanning tree algorithm
avoids loops generated by the IBM cabling.
If this command is to be implemented on a switch other than the stack master, a
session should be opened to the relevant switch.
The syntax for this command is:
show self-loop-discovery [mod_num]
Example:
P330-N# show self-loop-discovery 1
Self-Loop-Discovery is disabled on module 1.
148 Avaya P330 Reference Guide