Standby controller election criteria

Standby controller election is based on the following criteria:

• The highest priority
• Bootup as active controller
• Bootup as standby controller
• The lowest boot stack ID
• The lowest MAC address

Because standby election candidates must have startup configurations that have been synchronized with the active controller, if the active controller does not have a startup-config.txt file, no standby controller is elected. Once the write memory command is executed on the active controller, the startup-config.txt file is written and synchronized to all stack members, and a standby controller can be elected.