When Active/Active Clustering is enabled, the SonicOS internal DHCP server is turned off and cannot be enabled. Networks needing a DHCP server can use an external DHCP server. The SonicOS DHCP server should be disabled in the management interface before enabling Active/Active Clustering, and all DHCP server lease scopes deleted.
On Network | System > Interfaces, you can configure additional virtual IP addresses for interfaces in a Virtual Group, and redundant ports for interfaces.
For information about performing these tasks, see: