Management module

The switch can have two management modules (dual MM). In a VSF stack with dual MMs, both the Commander and Standby of the VSF stack each have only one MM (say MM1) as Active and the second MM (say MM2) as Offline.

If the Active MM (MM1) of the Commander fails, the Standby changes role and becomes the new Commander. The Offline MM (MM2) of the old Commander boots to join the stack as the new Standby. MM2 of the new Standby is now Active and MM1 is Offline