So what is DHCP failover , well simply put its when two dhcp servers share a pool of addresses, they can be configured either for Load balancing or as a hot standby server relationship.
In Hot standby one server will take the active role in handing out addresses whilst the other server is in passive and will only come into play when the Active server cannot be contacted
In Load Balancing mode both servers will be active and provide addresses to clients.
Some advantages of using DHCP Failover:
- High availability – Reduce the chances of the dhcp process failing and stopping a critical service.
- If Load balancing is used then it can split the workload over the two Servers.