Cisco Catalyst 2960 Series, Configuration Manual

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Result Scenario
The stack member with the saved
configuration file is elected active
switchstack master. Assuming that both stack members
have the same priority value:
1 Make sure that one stack
member has a default
configuration and that the other
stack member has a saved
(nondefault) configuration file.
2 Restart both stack members at
the same time.
Stack masterActive switch election
specifically determined by the
configuration file
The stack member with the lower
MAC address is elected active
switchstack master. Assuming that both stack members
have the same priority value,
configuration file, and feature set,
restart both stack members at the
same time. Stack masterActive switch election
specifically determined by the
MAC address
The stack member with the higher
priority value retains its stack
member number. The other stack
member has a new stack member
number. Assuming that one stack member
has a higher priority value than the
other stack member:
1 Ensure that both stack members
have the same stack member
number. If necessary, use the
switch
current-stack-member-number
renumber
new-stack-member-number
global configuration command.
2 Restart both stack members at
the same time.
Stack member number conflict
The active switchstack master is
retained. The new switch is added
to the switch stack.
1 Power off the new switch.
2 Through their stack ports,
connect the new switch to a
powered-on switch stack.
3 Power on the new switch.
Add a stack member
The standby switch becomes the
new active switch. All other stack
members in the stack remain as
stack members and do not reboot. Remove (or power off) the active
switchstack master. Stack masterActive switch failure
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Configuration Examples for Switch Stacks