Cisco SGE2000 Administration Manual page 30

• If the incoming unit already has an assigned Unit ID, and that Unit ID conflicts with a
unit ID in the current stack, the Stack Master allocates a new Unit ID to the incoming
unit, giving it the lowest available Unit ID. However, if the incoming unit has a
manually assigned Unit ID, the Stack Master cannot change it. If the incoming unit
cannot be assigned an available Unit ID, then it is shut down and is not joined to the
stack.
3. The Stack Master performs unit and port configuration for the incoming unit.
• Any configuration information that is relevant to the number assigned to the
incoming unit is applied by the Stack Master. For example, if the incoming unit is
assigned the same Unit ID of the unit it replaced, then when possible, it receives the
same configuration as the failed unit.
• If the incoming unit is identical to the replaced unit, the entire configuration of the
replaced unit is applied to the incoming unit and the stack returns to the state it was
in before unit failure.
If the incoming unit is not identical to the unit that failed, the Stack Master applies the
configuration in the following manner:
• If a 24-port unit replaces a failed 48-port unit, the ports of the incoming unit are
configured according to the configuration of the first 24 ports of the failed unit.
NOTE: The configuration of all 48 ports of the failed unit
is kept in memory, even though the first 24 are currently
applied. If, in the future, a 48 port unit is inserted and
assigned the same Unit ID, it is configured the same as
the original failed 48-port unit.
• If a 48-port unit replaces a 24-port unit, then the first 24 ports of the incoming unit
are configured according to configuration of the ports of the failed unit. The
remaining ports of the incoming are configured according to the default settings.
• If the units have uplink ports, then the first uplink port of the incoming unit is
configured according to the configuration of the first uplink port of the failed unit.
25
Linksys One Ready Communications Solution
Chapter 3: Connecting the Switch
Stack Troubleshooting and Maintenance
3