The DHCP failover protocol provides a method for two DHCP servers to communicate with each other.
Depending on the configuration, failover can provide both redundancy and load balancing. DHCP failover works by sharing one or more pools between two DHCP servers. The two servers are known as failover peers.
After placing two DHCP servers into a failover relationship, the addresses in each DHCP pool are divided between them. Half of the addresses are sent to the secondary server and half remain on the Primary server.
Failover peers don't need to be located in the same subnet, which provides you a great deal of flexibility when determining where to locate your DHCP servers.
- DHCP failover is only supported on BlueCat DNS/DHCP Servers. DHCP failover isn't yet supported on other types of managed servers.
- Enabling or disabling DHCP failover will restart the DHCP service, resulting in a service interruption.