Unit Id Assignment - Cisco 500 series Administration Manual
Stackable managed switch
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- Configuration manual (1140 pages) ,
- Administration manual (653 pages) ,
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Stack Management
Unit ID Assignment
Unit ID Assignment
Cisco 500 Series Stackable Managed Switch Administration Guide
After topology discovery is completed, each unit in a stack is assigned a unique
unit ID.
The unit ID is set in the System Mode and Stack Management page in one of the
following ways:
•
Automatically (Auto)—The Unit ID is assigned by the topology discovery
process. This is the default setting.
•
Manually—The unit ID is manually set.
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 few examples show where unit ID duplication might occur.
The following shows a case where two units received the same unit ID, manually.
The second unit 1 was subsequently shut down.
Duplicate Unit Shut Down
In the figure above, 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).
The following shows a case where one of the duplicate units (auto-numbered) is
renumbered.
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