Cisco SF500-24 Administration Manual page 71

Stack Management
Stack Changes and Unit ID Assignment
Cisco 500 Series Stackable Managed Switch Administration Guide
Figure 9 shows what happens when a user-assigned, master-enabled unit with
Unit ID 1 joins a stack that already has a master unit with user-assigned unit ID 1.
Unit 1 does not join the stack and is shutdown.
Figure 9 User-assigned Master-enabled Unit
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