7.2.3 Conditions to configure the stack
When configuring a stack, ensure that all of the following conditions are met between member switches:
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The switch number must be different
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The software licenses and features activated by the optional licenses match (except for uplink 10G and port-count extensions).
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Software version must match
If these conditions are not met, the member switches other than the master switch may restart again. The member switch then starts up with the default configuration information.
Even if the software versions do not match, the stack can be configured if the configurations match. However, in this case, the configuration cannot be edited.