DHCPv6 relay agent operation
Figure 69 shows how the DHCPv6 client obtains an IPv6 address and other network configuration parameters from the DHCPv6 server through the DHCPv6 relay agent, using the process of rapid assignment involving two messages.
Figure 69: Operating process of a DHCPv6 relay agent
The operation process is as follows:
The DHCPv6 client sends a Solicit message containing the Rapid Commit option to the multicast address FF02::1:2 of all the DHCPv6 servers and relay agents.
After receiving the Solicit message, the DHCPv6 relay agent encapsulates the message into the Relay Message option of a Relay-forward message, and sends the message to the DHCPv6 server.
After obtaining the Solicit message from the Relay-forward message, the DHCPv6 server selects an IPv6 address and other required parameters, and adds them to the reply which is encapsulated within the Relay Message option of a Relay-reply message. The DHCPv6 server then sends the Relay-reply message to the DHCPv6 relay agent.
The DHCPv6 relay agent obtains the reply from the Relay-reply message and sends the reply to the DHCPv6 client.
The DHCPv6 client uses the IPv6 address and other network parameters assigned by the DHCPv6 server to perform network configuration.