Dell Networking N1500 Serie Handbuch Zum Einstieg Seite 21

Stacking Standby
The stacking feature supports a Standby or backup unit that assumes the
Master unit role if the Master unit in the stack fails. As soon as a Master
failure is detected in the stack, the Standby unit enables the control plane on
the new Master unit and synchronizes all other stack units with the current
configuration. The Standby unit maintains a synchronized copy of the
running configuration for the stack. The Standby unit is automatically
selected in the stack; however, you can use the CLI to select a different stack
member as Standby. See the User's Configuration Guide or the CLI Reference
Guide for more information.
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Getting Started Guide