Master is compatible with the switch in VM mode and the tar file of The auto-upgrade occurs if the software release that runs on the stack (auto-upgrade) and the automatic advise (auto-advise) features.
With the switch stack image or with a tar file image from the switch
Software and tries to upgrade (or downgrade) the switch in VM mode Switch enters version-mismatch (VM) mode and cannot join the stack asĪ fully functional member. When connected to a switch stack, a partially compatible Version number as the stack master are considered partiallyĬompatible. Switches with the same major version number but with a different minor Version numbers are incompatible and cannot exist in the same switchġ Member 0015.c6f5.6000 1 Version Mismatch Switches with different Cisco IOS software versions likely haveĭifferent stack protocol versions. Incompatibility on the specific stack members. Generate a system message that describes the cause of the If an incompatibility exists, the fully functional stack members Switches with the sameĬisco IOS software version as the stack master immediately join the Such switches are fully compatible, and all featuresįunction properly across the switch stack. Switches with the same Cisco IOS software version have the same stack Switch Master/ Mac Address Version Uptime Current 3750-Stk# show platform stack manager all Your switch stack, you can issue the show platform stack managerĪll command. Software compatibility between the stack members is determined by the
Having the same IOS version on a switch before adding it to a stack can save you problems.Ĭisco has a very good document, which contains a full explanation about this:Ĭreation and Management of Catalyst 3750 Switch Stacks Software Compatibility Switches with the same major version numbers probably have the same stack protocol version, but that is not guaranteed. Basically, the switches need to have the same stack protocol version, and only switches with the same IOS version are guaranteed to have that. You should really set the IOS version to be the same before adding a switch to the stack.