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Catalyst 3750 Switch Software Configuration Guide
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Chapter 5 Managing Switch Stacks
Understanding Switch Stacks
For configuration information, see the “Provisioning a New Member for a Switch Stack” section on
page 5-18.
Effects of Replacing a Provisioned Switch in a Switch Stack
When a provisioned switch in a switch stack fails, is removed from the stack, and is replaced with
another switch, 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 described in the “Effects of Adding a Provisioned Switch to a
Switch Stack” section on page 5-8.
Effects of Removing a Provisioned Switch from a Switch Stack
If a switch stack is running Cisco IOS Release 12.2(20)SE or later and you remove a provisioned switch
from a 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.
Hardware Compatibility in Switch Stacks
The Catalyst 3750-12S switch supports desktop and aggregator Switch Database Management (SDM)
templates. All other Catalyst 3750 switches support only the desktop SDM templates.
All stack members use the SDM template configured on the stack master. If the stack master is using an
aggregator template, only Catalyst 3750-12S switches can be stack members. All other switches
attempting to join this switch stack enter SDM mismatch mode. These switches can join the stack only
when the stack master is running a desktop SDM template.
We recommend that your stack master use an aggregator template only if you plan to create a switch
stack of Catalyst 3750-12S switches. If you plan to have a switch stack with different Catalyst 3750
switch models, configure the stack master to use one of the desktop templates.
Note Version mismatch (VM) mode has priority over SDM mismatch mode. If a VM mode condition and an
SDM mismatch mode exist, the switch stack attempts to resolve the VM mode condition first.
You can use the show switch privileged EXEC command to see if any stack members are in SDM
mismatch mode.
For more information about SDM templates and SDM mismatch mode, see the Chapter 8, “Configuring
SDM Templates.”
Software Compatibility in Switch Stacks
This section describes how to ensure software compatibility between stack members:
• Compatibility Recommendations, page 5-11
• Incompatible Software and Stack Member Image Upgrades, page 5-11
• Stack Protocol Version Compatibility, page 5-11
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