1-10
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Managing Switch Stacks
Understanding Switch Stacks
If you add a provisioned switch that is a different type than specified in the provisioned configuration to
a powered-down switch stack and then apply power, the switch stack rejects the (now incorrect) switch
stack-member-number provision type global configuration command in the startup configuration file.
However, during stack initialization, the nondefault interface configuration information in the startup
configuration file for the provisioned interfaces (potentially of the wrong type) is executed. Depending
on the differences between the actual switch type and the previously provisioned switch type, some
commands are rejected, and some commands are accepted.
For example, suppose the switch stack is provisioned for a 48-port switch with Power over Ethernet
(PoE), the configuration is saved, and the stack is powered down. Then a 24-port switch without PoE
support is connected to the switch stack, and the stack is powered up. In this situation, the configuration
for ports 25 through 48 is rejected, and error messages appear during initialization. In addition, any
configured PoE-related commands that are valid only on PoE-capable interfaces are rejected, even for
ports 1 through 24.
Note If the switch stack does not contain a provisioned configuration for a new switch, the switch joins the
stack with the default interface configuration. The switch stack then adds to its running configuration a
switch stack-member-number provision type global configuration command that matches the new
switch.
The stack member number of
the provisioned switch is in
conflict with an existing stack
member.
The stack master assigns a new stack member
number to the provisioned switch.
The stack member numbers and the switch types
match:
1. If the new stack member number of the
provisioned switch matches the stack
member number in the provisioned
configuration on the stack, and
2. If the switch type of the provisioned switch
matches the switch type in the provisioned
configuration on the stack.
The switch stack applies the provisioned
configuration to the provisioned switch
and adds it to the stack.
The provisioned configuration is changed
to reflect the new information.
The stack member numbers match, but the
switch types do not match:
1. If the stack member number of the
provisioned switch matches the stack
member number in the provisioned
configuration on the stack, but
2. The switch type of the provisioned switch
does not match the switch type in the
provisioned configuration on the stack.
The switch stack applies the default
configuration to the provisioned switch
and adds it to the stack.
The provisioned configuration is changed
to reflect the new information.
The stack member number of
the provisioned switch is not
found in the provisioned
configuration.
The switch stack applies the default
configuration to the provisioned switch
and adds it to the stack.
Table 1-1 Results of Comparing the Provisioned Configuration with the Provisioned Switch (continued)
Scenario Result
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