DHCPv6 relay agent operating process

As shown in Figure 81, a DHCPv6 client obtains an IPv6 address and other network configuration parameters from a DHCPv6 server through a DHCPv6 relay agent. The following example uses rapid assignment to describe the process:

• 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 performs the following tasks:

  • Selects an IPv6 address and other required parameters.

  • Adds them to a reply that is encapsulated within the Relay Message option of a Relay-reply message.

  • 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 complete network configuration.