D-Link AirPremier DAP-3690 User Manual page 74

Section 4 - Using the AP Array
Situations Encountered with the Different Implementations:
Multiple Master APs: If there are two or more Master APs assigned in an array, the AP with the longest run-time will become the Master AP.
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Note: The other Master APs will become Backup Master APs.
Manually Configured Slave AP: At intervals of one minute, the Master AP will send out a beacon to check the status of the Slave APs. If any
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changes are done to the slave APs manually, the Master AP will automatically synchronize its configuration to the slave AP and overwrite it.
Master AP Crashed: In a situation where the Master AP becomes unavailable to the array, the Backup Master AP will take over the Master role
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and synchronize the configuration to the Slave APs.
• No Backup Master AP Available: If the Master AP crashes and there are only Slave APs in the array, the Slave APs will work as stand-alone APs
until a new Master joins the array. The administrator may want to configure two Master APs for the array, so that there is always a Backup Master
AP available.
D-Link DAP-3690 User Manual 74