Avaya P330 Reference Manual page 23

Chapter 1 Using the CLI
type the following command:
session router.
To configure the switch parameters, on module 6, type the command:
session 6 switch.
Note: When you use the session command the security level stays the same.
Note: Use the session command without any parameters to identify the stack
master and its slot number. It will list all the modules in the stack and their slot
number with the master module marked with an asterisk.
Avaya P330 Reference Guide 5