Administration: Stack Management
Unit ID Assignment
121 Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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The following shows a case where two units  manually assigned the same unit ID. Unit 1 does 
not join the stack and is shut down. It did not win the master selection process between the 
master-enabled units (1 or 2).
Duplicate Unit Shut Down
The following shows a case where one of the duplicate units (auto-numbered) is renumbered. 
Duplicate Unit Renumbered