Dhcpv6 Overview; Introduction To Dhcpv6; Dhcpv6 Address/Prefix Assignment; Rapid Assignment Involving Two Messages - HP A5120 EI Series Configuration Manual

DHCPv6 overview

Introduction to DHCPv6

The Dynamic Host Configuration Protocol for IPv6 (DHCPv6) was designed based on IPv6 addressing
scheme and is used for assigning IPv6 prefixes, IPv6 addresses and other configuration parameters to
hosts.
Compared with other IPv6 address allocation methods (such as manual configuration and stateless
address autoconfiguration), DHCPv6 can:
 Record addresses assigned to hosts and assign specific addresses to hosts, thus facilitating network
management.
Assign prefixes to devices, thus facilitating automatic configuration and management of the entire

network.
Assign other configuration parameters, such as the DNS server addresses and domain names, to

hosts.

DHCPv6 address/prefix assignment

A process of DHCPv6 address/prefix assignment involves two or four messages. The following describe
the detailed processes.

Rapid assignment involving two messages

Figure 58 Rapid assignment involving two messages
DHCPv6 client
(1) Solicit (contains a Rapid
As shown in
The DHCPv6 client sends out a Solicit message that contains a Rapid Commit option, requesting
1.
that rapid assignment of address/prefix and other configuration parameters should be preferred.
If the DHCPv6 server supports rapid assignment, it responds with a Reply message containing the
2.
assigned IPv6 address/prefix and other configuration parameters. If the DHCPv6 server does not
support rapid assignment,

Assignment involving four messages

Figure 59 shows the process of IPv6 address/prefix assignment involving four messages.
DHCPv6 server
Commit option)
(2) Reply
Figure 58, the rapid assignment involving two messages operates in the following steps.
Assignment involving four messages
142
is implemented.