Allied Telesis 48Ts/X Installation Manual page 68

Chapter 2: Virtual Chassis Stacking
members should be green. Port LEDs that are off or flashing amber
indicate that the stack is not operating correctly. The master or status LED
will be green on the switch that is the stack master.
6. Configure the stack as one switch
You are now ready to configure the stack with channel groups, VLANs, IP
addresses, and so on.
Once you are happy with the stack configuration, make a backup copy of
the configuration file.
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