DHCP failover is a feature that enables DHCP servers to maintain high availability by replicating scope information between two DHCP servers in a failover relationship.
Note: first time full scope replication is going to run automatically when you configure failover relationship. After that only IP address leases are replicated on a continual basis. Other configuration changes like reservations, scope options, exclusion ranges etc. need to be replicated manually by running Invoke-DhcpServerv4FailoverReplication cmdlet.
There are two available failover modes:
- Load balance (also known as active-active failover relationship)
- Hot standby (also known as active-passive failover relationship)
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