3Com SuperStack 3 3CR17561-91 Getting Started Manual - page 75
Manual is about: Switch 4500 Family Switch 4500 26/50-Port Switch 4500 PWR 26/50-Port
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Solving Stack Formation Problems
75
Solving Stack
Formation
Problems
If you are having problems with correctly forming a stack, first ensure that
Spanning Tree is enabled. If it is enabled, do the following:
1 Power off all units in the stack.
2 Check all the cable connections in the stack.
3 Check the ports have been enabled as stack ports.
4 Power on all units in the stack.