R2511-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V5)

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Binding
The DHCPv6 server uses bindings to record the configuration information assigned to DHCPv6 clients,
including the IPv6 address/prefix, client DUID, IAID, valid lifetime, preferred lifetime, and lease
expiration time.
PD
The DHCPv6 server creates a Prefix Delegation (PD) for each assigned prefix to record the IPv6 prefix,
client DUID, IAID, valid lifetime, preferred lifetime, and lease expiration time.
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
As shown in Figure 113 , the rapid assignment involving two messages operates as follows:
1. The DHCPv6 client sends out a Solicit message that contains a Rapid Commit option, requesting
that rapid assignment of address/prefix and other configuration parameters should be preferred.
2. If the DHCPv6 server supports rapid assignment, it responds with a Reply message containing the
assigned IPv6 address/prefix and other configuration parameters. If the DHCPv6 server does not
support rapid assignment, Assignment involving four messages is i
mplemented.
Figure 113 Rapid assignment involving two messages
Assignment involving four messages
Figure 114 shows the process of IPv6 address/prefix assignment involving four messages.
Figure 114 Assignment involving four messages