Allied Telesis AT-8000GS/48 - Manual (Page 42)

Chapter 3: Stacking
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12. From the Stack menu, press “3”. The Startup menu is displayed.
13. From the Startup menu, press “7”. The Startup menu is closed and the
device continues the Startup process.
Note
Once the device is booted up and operational in the stack, the
configuration can be modified through the Web or CLI.