You can deploy DHCP Server as a standalone server or in a High Availability (HA) pairing on two switches in a primary-standby configuration. In an HA pair, the primary DHCP Server manages the DHCP service for clients and shares lease information with the standby server. The standby server becomes active only if the primary server is inactive.
To deploy High Availability, perform the following actions:
Configure DHCP Server on both peer switches. You can assign the primary and standby roles to each switch manually or the switches can assign roles automatically. By default, the switch with the lower IP address is primary.
Configure the network so that clients can connect to both peer switches.
Synchronize the clocks on the two HA peer switches using a protocol, such as NTP or configure the system clocks on the two HA peers manually.