R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

Table Of Contents

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Configuring the DHCPv6 relay agent

Introduction to the DHCPv6 relay agent

Figure 365 Typical DHCPv6 relay agent application

A DHCPv6 client usually uses a multicast address to contact the DHCPv6 server on the local link to obtain

an IPv6 address and other configuration parameters. As shown in Figure 365, if the DHCPv6 ser

ver

resides on another subnet, the DHCPv6 client can contact the server via a DHCPv6 relay agent. Thus, you

do not need to deploy a DHCPv6 server on each subnet.

DHCPv6 relay agent operation

Figure 366 Operating process of a DHCPv6 relay agent

Take the process of rapid assignment by using two messages as an example. Figure 366 shows how the

DHCPv6 client obtains an IPv6 address and other network configuration parameters from the DHCPv6

server through the DHCPv6 relay agent.

1. 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.

2. 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.