Allied Telesis 8100S Series - Manual (Page 89)

Stack Installation Guide for 8100S Series Switches
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4. To add a redundant path to the stack, connect a stacking cable to the
empty stacking ports on the top and bottom switches.
An example of a stack with a redundant path is shown in Figure 36.
Figure 36. Example Stack of Four Switches with a Redundant Path
5. Go to Chapter 6, “Powering On and Verifying the Stack” on page 91.