Change Unit-Id - 3Com 5500-EI PWR Reference Manual

If you do not bring up the fabric port, you cannot change the unit ID of a switch.
After the unit ID of a device is changed, the unit ID-related information of this device in the
configuration file of the fabric will be upgraded automatically. If the unit ID of a device changes from
2 to 4, the port description of this device in the configuration file automatically changes from 2/0/x to
4/0/x.
Examples
# Configure the unit ID of the current switch to be automatically numbered.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] change self-unit to auto-numbering

change unit-id

Syntax
change unit-id unit-id1 to { unit-id2 | auto-numbering }
View
System view
Parameters
unit-id1: Current unit ID.
unit-id2: New unit ID.
auto-numbering: Changes the numbering mode of unit ID on a specified switch (not the current switch)
to automatic numbering mode.
Description
Use the change unit-id command to configure the unit ID of a specified switch in an XRN fabric to a
new value. By default, when a switch is added to an XRN fabric, it uses the automatically assigned unit
ID.
When you change the unit ID of a switch in an XRN fabric, note the following:
If the modified unit ID of the switch is not used in the fabric, the system sets its priority to 5 and
saves it in the Flash memory of the switch.
If the modified unit ID is being used, the system prompts you to confirm if you really want to change
the unit ID. If you choose to change it, the existing unit ID is replaced and the priority is set to 5. The
original device which uses this unit ID will be auto-numbered again. Then you can use the fabric
save-unit-id command to save the modified unit ID into the Flash memory of the switch.
If auto-numbering is selected, the system reserves the unit ID and sets the unit priority to 10. You
can use the fabric save-unit-id command to save the modified unit ID into the Flash memory of
the switch.
1-2