3.1.5.4 Receiving a DHCP Failover UPDREQ Message

When a DHCP server implementing this specification receives an UPDREQ message that contains a Scope IDs List Option (section 2.2.2), the server MUST send the lease updates of all DHCPv4 clients serviced from the IPv4 subnets included in the Scope IDs List Option (section 2.2.2).

If the message does not contain the Scope IDs List Option (section 2.2.2), the UPDREQ message MUST be processed as specified in [IETF-DHCPFOP-12] section 7.3.2.

When all the pending lease updates have been synchronized with the failover partner server, the UPDDONE message MUST be sent as specified in [IETF-DHCPFOP-12] section 7.5.2.