Configuring Dhcpv6 Relay Agent; Dhcpv6 Relay Agent Operation - HP 10500 Series Configuration Manual

Configuring DHCPv6 relay agent

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
resides on another subnet, the DHCPv6 client can contact the server through a DHCPv6 relay agent, so
you do not need to deploy a DHCPv6 server on each subnet.
Figure 56 Typical DHCPv6 relay agent application environment

DHCPv6 relay agent operation

Figure 57 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 as an example.
Figure 57 Operating process of a DHCPv6 relay agent
DHCPv6 client
(1)
Solicit (contains a Rapid Commit option)
The DHCPv6 client sends a Solicit message containing the Rapid Commit option to the multicast
1.
address FF02::1:2 of all DHCPv6 servers and relay agents.
After receiving the Solicit message, the DHCPv6 relay agent encapsulates the message into the
2.
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
3.
IPv6 address and other required parameters, and adds them to the reply which is encapsulated
DHCPv6 relay agent
(4) Reply
(2) Relay-forward
(3) Relay-reply
139
Figure 56, if the DHCPv6 server
DHCPv6 server