HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 118

Configuring DHCPv6 relay agent, Overview, DHCPv6 relay agent operation

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Configuring DHCPv6 relay agent 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 Figure 54, if the DHCPv6 server resides on another subnet, the DHCPv6 client can contact the server via a DHCPv6 relay agent, so you do not need to deploy a DHCPv6 server on each subnet. Figure 54 Typical DHCPv6 relay agent application DHCPv6 relay agent operation Figure 55 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 55 Operating process of a DHCPv6 relay agent DHCPv6 client DHCPv6 relay agent DHCPv6 server (1) Solicit (contains a Rapid Commit option) (4) Reply (2) Relay-forward (3) Relay-reply The operation process is as follows: 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. 110

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110
Configuring DHCPv6 relay agent
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
Figure 54
, if the DHCPv6 server
resides on another subnet, the DHCPv6 client can contact the server via a DHCPv6 relay agent, so you
do not need to deploy a DHCPv6 server on each subnet.
Figure 54
Typical DHCPv6 relay agent application
DHCPv6 relay agent operation
Figure 55
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 55
Operating process of a DHCPv6 relay agent
The operation process is as follows:
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.
(1)
Solicit (contains a Rapid Commit option)
(4) Reply
DHCPv6 client
DHCPv6 relay agent
DHCPv6 server
(2) Relay-forward
(3) Relay-reply