A pre-master switch is ready to transition to master, but is going through possible loop detection before changing to the master state.
Upon entering the pre-master state, the switch sends ESRP (Extreme Standby Router Protocol) packets to other switches on that same VLAN (Virtual LAN). If the switch finds itself superior to its neighbor, and successfully executes loop detection techniques, the switch transitions to master. This temporary state avoids the possibility of having simultaneous masters.
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