Configuring The Dhcpv6 Relay Agent; Overview - HP 6125XLG Layer 3-Ip Services Configuration Manual

Configuring the DHCPv6 relay agent

The term "interface" in this section collectively refers to VLAN interfaces and Layer 3 Ethernet interfaces.
You can set an Ethernet port as a Layer 3 interface by using the port link-mode route command (see
Layer 2—LAN Switching Configuration Guide).

Overview

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 clients need a DHCPv6 relay agent to contact the server. The
relay agent feature avoids deploying a DHCP server on each subnet.
Figure 72 Typical DHCPv6 relay agent application
DHCPv6 client
DHCPv6 client
As shown in
parameters from a DHCPv6 server through a DHCPv6 relay agent in the following steps (rapid
assignment involving two messages):
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, adds them to a reply that is encapsulated within the
Relay Message option of a Relay-reply message, and 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.
DHCPv6 client
DHCPv6 relay agent
DHCPv6 client
Figure 73, a DHCPv6 client obtains an IPv6 address and other network configuration
IPv6 network
DHCPv6 server
178
Figure 72, if the DHCPv6 server