Are you sure? When a new switch stack is created, or a new switch is added to an existing stack, the below configurations will be removed from the stand-alone switch(es) and will need to be reconfigured on the stack: Link aggregates Mirrored ports SVIs IGMP snooping (if switch specific settings are configured) MTU size (if switch specific settings are configured) STP priority (if switch specific settings are configured) Features like the ones above run one instance for the entire switch. When a stack is created, you are combining multiple physical switches all running their own instances of the feature to a single logical switch, which is why some features need to be reconfigured.
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