Any existing port-level configuration in the newly-added switch is automatically cleared or updated. The master switch revises the new member switch port numbers to conform to the current port numbering sequence in the stack. When you add a switch to a stack, the stack master automatically changes the configuration of the new switch. Return the switch to its default values before you connect it to a new stack. These switches do not use licenses to activate features.Ī switch previously used as a standalone or in a different stack might have different configuration settings. Note Activating a specific feature set on Catalyst 3750 switches requires a specific Cisco IOS version in each switch. After you connect a new switch to a switch stack, enter the show version user EXEC command to see the version information, the switch types, and the active Cisco IOS version for each switch: The Cisco IOS software version running on a switch that you plan to add to a switch stack must either be the same as or compatible with on the master switch version. The stack master reports the reason for any incompatibility.
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