Cisco CATALYST 2960 - Stack Protocol Version Compatibility; Switches with the same Cisco IOS software version have the same stack protocol version. All features function properly across the stack. These switches with the same software version as the master immediately join the stack.; Major Version Number Incompatibility Among Switches; Switches with different Cisco IOS software versions likely have different stack protocol versions. Switches with different major version numbers are incompatible and cannot exist in the same stack.

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Catalyst 2960 Switch Command Reference
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Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
mls qos
Related Commands Command Description
show mls qos Displays QoS information.