Allied Telesis AT-9448Ts Installation Manual page 72

Chapter 3: Preparing the Switches of the Stack
72
If the master switch successfully completes the discovery process but the
SHOW STACK command displays only one switch or a subset of the
switches of the stack, try the following:
Verify that all of the switches are powered on.
Verify that all of the switches are using the same version of the AT-S63
Management Software. For instructions, refer to "Verifying the AT-S63
Version Number" on page 52.
Verify that the stacking cables are securely connected to the ports on
the AT-StackXG Stacking Modules and that the cables crossover to
different numbered ports on the modules. For information, refer to
"Cabling the AT-StackXG Stacking Modules" on page 62.