3Com 5500-EI PWR Reference Manual page 848

Unit IDs in an XRN fabric are not always arranged in order of 1 to 8.
Unit IDs in an XRN fabric can be inconsecutive.
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.
Related commands: fabric save-unit-id, display ftm.
Examples
# Display the unit ID information about each switch in an XRN fabric.
<Sysname> display ftm topology-database
Total number of units in fabric : 2, My CPU ID : 6
UID CPU-Mac
1 000f-e20f-5002 10
2 000f-e20f-5132 10
3 000f-e20f-5252 10
4 000f-e20f-8922 10
5 000f-cbb7-2142 10
*6 000f-cbb7-3264 10
7 000f-cbb7-2260 10
8 000f-cbb7-2734 10
# Change the unit ID of the switch from 6 to 4.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] change unit-id 6 to 4
The unit 4 already exists in fabric.
Continue? [Y/N] y
%Apr 2 00:48:34:574 2000 Sysname FTM/3/DDPFLA:- 6 -Change unitid successful, un
it 4 saved UnitID(4) in flash!
# Display the unit ID information about each switch in the fabric.
[Sysname] display ftm topology-database
Total number of units in fabric : 2, My Unit ID : 4
UID CPU-Mac
1 000f-e20f-5002 10
2 000f-e20f-5132 10
3 000f-e20f-5252 10
*4 000f-cbb7-3264 5
5 000f-cbb7-2142 10
6 000f-e20f-8922 10
7 000f-cbb7-2260 10
8 000f-cbb7-2734 10
Priority Fabric-Port Board-ID A/M
/Right 1
Left/ 1
/Right 1
Left/ 1
/Right 1
Left/ 1
/Right 1
Left/ 1
Priority Fabric-Port Board-ID A/M
/Right 1
Left/ 1
/Right 1
Left/ 1
/Right 1
Left/ 1
/Right 1
Left/ 1
A
A
A
A
A
A
A
A
A
A
A
M
A
A
A
A
1-3