DHCP Failover between sites with Multiple DHCP Servers.

Question

We have two physical sites having 2 Windows 2022 DHCP Servers each site.

Site 1 - DHCP Server A & B.
Site 1 - DHCP Server C & D.

For DHCP we want to enable HA at local and per site.

Like configure load balancing mode between - A & B at site 1
load balancing mode between - C & D at site 2

Now let's say Site a is live but DHCP network went down, so A & B are not available. To overcome this I want other 2 servers C & D to serve at site A. What I should do to achieve this.

Or, what is the maximum combination of architecture I can use with those 4 servers, kindly suggest.

Thanks

Answer 1

Hi there,

A single DHCP server can support up to 31 failover relationships

You can configure failover in one of the two modes, hot standby or load balancing mode. High availability is accomplished by the replication of the DHCP database between the respective servers. In the hot standby mode, one server is primary (active) and the other is secondary (passive).

The load distribution ratio is configurable (50-50 being the default). In larger networks, this is a very useful feature. Not only is high availability accomplished but the infrastructure gains the added benefit of an increase in overall performance and responsiveness.

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