Behavior of 'Preferred' Option when two NTP servers are added

The Prefer option is an NTP level setting. Not only the ADC, but all devices conform to the rules in the RFC : http://doc.ntp.org/3-5.93e/prefer.html

Case 1: When 2 NTP servers are added with preferred option as YES set for both servers.

-It uses mitigation rules defined in the RFC. http://doc.ntp.org/3-5.93e/prefer.html (Please refer to the Mitigation Rules section)

Case 2: When 2 NTP servers are added with preferred option as YES set for one server, and NO for the other server

-The appliance synchronizes with that particular server first which has preferred option as YES.

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