Configuration of Stacked Access Switches Solutions

A switch stack is a set of up to nine Catalyst 3750, 3750-E, 3750-X switches connected through their StackWise ports, or up to four 2960-S switches connected through their FlexStack connectors. One of the switches controls the operation of the stack and is called the stack master. The stack master and the other switches in the stack are stack members. The stack members use the Cisco StackWise (or FlexStack) technology to behave and work together as a unified system. Layer 2 and Layer 3 protocols present the entire switch stack as a single entity to the network. The stack master is the single point of stack-wide management.

NOTE: Catalyst 3850 switches cannot be stacked with any other switch model and maximum stack size is 4. As with 3750X switches all members must be running the same feature set.

Adding 3750-X Switches to Existing Stacks of 3750/3750-E Switches

Adding 3750-x switches to existing stacks can cause issues. Please note the following recommendations:-

1. An existing stack needs to be running the minimum level of IOS (minimum IOS version is 12.2(53)SE2 but IOS version 12.2(55)SE and later recommended) to support the 3750-X hardware before any attempt is made to add the 3750-X to the stack.

2. Ensure that the 3750-X switch is running the same IOS release (IOS 12.2(55)SE or later recommended) and has the same licence enabled as the existing stack members before it is added to the stack.

3. If the existing stack is running multiple IOS feature sets (e.g. IP Services on the master and standby and IP Base on the other members of the stack) then the stack will require to be upgraded so that all stack members are running the same feature-set. The 3750-X switch that is being added to the stack will also have to have the same licence to be enabled (IP Services in the example).

4. Due to issues found when carrying out this testing it is not recommended to use the archive command to upgrade all stack members at the same time. The recommendation is to use the archive command with the /destination-system option and upgrade each member of the stack individually.

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