Please explain the Failover options for an A / AAAA, CNAME, ANAME record.
Posted by Richard Smith on 15 February 2018 02:49 AM

Normal (always lowest level) - In this configuration the DNS Failover services will always try to move back to IP #1 (if it is back up). Similarly if IP #2 is up and IP #1 is down, then it will move to IP #2, then move to IP #1 once that IP is detected as being up. This scenario is most popular if all systems have the same information and are able to recovery from failure / being offline.

Off on any Failover event - In this configuration once any failover even happens, failover will be turned off. No future automated changes would happen unless you turn failover back on. This is mostly used when there is a primary / secondary setup or when there is a primary / multi-secondary setup. Usually in this scenario a user would need to copy data back to the system at IP #1 before it can be made usable again.

One Way (move to higher level) - In this configuration the failover events will only go from IP #1 to IP #(2 or higher). Similarly if the current system is set to IP #2 it will only failover to IP #(3 or higher). When IP #1 does come back online, the system would not automatically failover back to IP #1 (such as it would in the "Normal (always lowest level)" option). This scenario is usually chosen when IP #1 is a master of IP #2. IP #2 is a master of IP #3, IP #3 is a master of IP #4, and so on.
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