My test scenario my stack is running 3.6.4, whilst my new switch has a lower firmware 3.2.3. With the command "software auto-upgrade enable" configured on my existing stack, this command will upgrade any lower firmware switch to the same version as the master. Or else you will get an output below:
sw1#show switch
Switch/Stack Mac Address : 00ca.e5b9.3400 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
*1 Active 00ca.e5b9.3400 1 V07 Ready
2 Member 346f.90b9.ea00 1 0 V-Mismatch
However if you have "software auto-upgrade enable" configured, the master switch will automatically upgrade the new switch.
sw01#
*Jul 27 19:30:03.966: %STACKMGR-1-STACK_LINK_CHANGE: 1 stack-mgr: Stack port 1 on switch 1 is up
*Jul 27 19:30:13.605: %STACKMGR-6-SWITCH_ADDED: 1 stack-mgr: Switch 2 has been added to the stack.
*Jul 27 19:30:36.453: %INSTALLER-6-AUTO_UPGRADE_SW_INITIATED: 1 installer: Auto upgrade initiated for switch 2
*Jul 27 19:30:36.455: %INSTALLER-6-AUTO_UPGRADE_SW: 1 installer: Searching stack for software to upgrade switch 2
*Jul 27 19:30:36.457: %INSTALLER-6-AUTO_UPGRADE_SW: 1 installer: Found donor switch 1 to auto upgrade switch 2
*Jul 27 19:30:36.457: %INSTALLER-6-AUTO_UPGRADE_SW: 1 installer: Upgrading switch 2 with software from switch 1
sw01#
*Jul 27 19:31:53.446: %INSTALLER-6-AUTO_UPGRADE_SW: 1 installer: Finished installing software on switch 2
*Jul 27 19:31:53.446: %INSTALLER-6-AUTO_UPGRADE_SW: 1 installer: Reloading switch 2 to complete the auto upgrade
*Jul 27 19:31:53.723: %STACKMGR-1-RELOAD_REQUEST: 1 stack-mgr: Received reload request for switch 2, reason Auto upgrade
*Jul 27 19:31:54.118: %STACKMGR-1-STACK_LINK_CHANGE: 1 stack-mgr: Stack port 1 on switch 1 is down
*Jul 27 19:31:54.120: %STACKMGR-6-SWITCH_REMOVED: 1 stack-mgr: Switch 2 has been removed from the stack.
*Jul 27 19:31:54.125: Starting SWITCH-DELETE sequence, switch 2
*Jul 27 19:31:54.135: SWITCH-DELETE sequence complete, switch 2
sw01#
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