If the switch stack does not contain a provisioned configuration for a new Device, the Device joins the stack
with the default interface configuration. The switch stack then adds to its running configuration with a switch
stack-member-number provision type global configuration command that matches the new Device. For
configuration information, see the Provisioning a New Member for a Switch Stack section.
Note
Effects of Replacing a Provisioned Switch in a Switch Stack
When a provisioned switch in a switch stack fails, it is removed from the stack, and is replaced with another
Device, the stack applies either the provisioned configuration or the default configuration to it. The events
that occur when the switch stack compares the provisioned configuration with the provisioned switch are the
same as those when you add a provisioned switch to a stack.
Effects of Removing a Provisioned Switch from a Switch Stack
If you remove a provisioned switch from the switch stack, the configuration associated with the removed
stack member remains in the running configuration as provisioned information. To completely remove the
configuration, use the no switch stack-member-number provision global configuration command.
Stack Protocol Version
Each software image includes a stack protocol version. The stack protocol version has a major version number
and a minor version number (for example 1.4, where 1 is the major version number and 4 is the minor version
number). Both version numbers determine the level of compatibility among the stack members.
The switches with the same Cisco IOS software version have the same stack protocol version. Such switches
are fully compatible, and all features function properly across the switch stack. A device with the same Cisco
IOS software version as the active switch can immediately join the switch stack.
If an incompatibility exists, the fully functional stack members generate a system message that describes the
cause of the incompatibility on the specific stack members. The active switch sends the message to all stack
members.
For more information, see the Major Version Number Incompatibility Among Switches procedure and the
Minor Version Number Incompatibility Among Switches procedure.
Major Stack Protocol Version Number Incompatibility Among Stack-Capable Switches
Device with different major Cisco IOS software versions usually have different stack protocol versions. Device
with different major version numbers are incompatible and cannot exist in the same switch stack.
Minor Stack Protocol Version Number Incompatibility Among Stack-Capable Switches
Auto-Upgrade
The purpose of the auto-upgrade feature is to allow a switch to be upgraded to a compatible software image,
so that the switch can join the switch stack.
When a new switch attempts to join a switch stack, each stack member performs compatibility checks with
itself and the new switch. Each stack member sends the results of the compatibility checks to the active stack,
Managing Switch Stacks
9
Managing Switch Stacks
Effects of Replacing a Provisioned Switch in a Switch Stack
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