Assignment involving four messages
As shown in Figure 65, four-message assignment operates using the following steps:
The DHCPv6 client sends a Solicit message to request an IPv6 address/prefix and other configuration parameters.
The DHCPv6 server responds with an Advertise message that contains the assignable address/prefix and other configuration parameters if either of the following conditions exists:
The Solicit message does not contain a Rapid Commit option.
The DHCPv6 server does not support rapid assignment even though the Solicit message contains a Rapid Commit option.
The DHCPv6 client might receive multiple Advertise messages offered by different DHCPv6 servers. It selects an offer according to the receiving sequence and server priority, and sends a Request message to the selected server for confirmation.
The DHCPv6 server sends a Reply message to the client, confirming that the address/prefix and other configuration parameters are assigned to the client.
Figure 65: Assignment involving four messages