3Com 5500-EI PWR, Getting Started Manual

Page: 60 / 118

60 C
HAPTER
4: C
REATING AN
XRN S
TACKING
F
ABRIC
Unit Numbering
within the Fabric
When a Fabric is created using the Switch 5500 the unit numbering can
be determined in two ways.
■
You can manually assign unit IDs 1 to 8 to specific units using the
c
hange[self-unit, unit-id] to [1-8,
auto-numbering]
command from the System View. If you
manually assign unit IDs to a Switch via the
change
command the IDs
will be retained after a power cycle.
If you add a unit to a Fabric that has previously been manually
configured with a unit ID and this conflicts with an ID already within
the Fabric, then the Switch with the lowest MAC address assumes the
ID in question and the other unit will automatically renumber.
3Com recommends that you manually assign the unit IDs within the
Fabric if you wish to have predictability of knowing which units have
which IDs at all times.
■
Fabric topology is ‘discovered’ and the units auto-number their IDs.
Adding and removing units from the Fabric does not cause any
renumbering to occur and the Fabric will continue to work normally.
Renumbering only occurs when the Fabric is next power cycled if the
units are configured to auto-number.
The unit LEDs will display the unit number in the Fabric, from 1 to 8.
Figure 17 Resilient Fabric example (using 4 units)
If you are having problems, refer to “Solving Fabric Formation Problems”
on page 66 .
DUA1715-0AAA02.book Page 60 Wednesday, March 23, 2005 11:17 AM