Unit Id Assignment - Cisco 350 Series Administration Manual

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Unit ID Assignment

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After topology discovery is completed, each unit in a stack is assigned a unique unit ID.
The unit ID is set in the
• Automatically (Auto)—The Unit ID is assigned by the topology discovery process.
• Manually—The unit ID is manually set to an integer from 1-maximum number of
units in a stack.
Duplicate Unit IDs
If you assign the same unit ID to two separate units, only one of them can join the stack with
that unit ID.
If auto numbering has been selected, the duplicate unit is assigned a new unit number. If auto
numbering was not selected, the duplicate unit is shut down.
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
Stack Management page in one of the following ways:
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
Administration: Stack Management
Unit ID Assignment