237
{ The Solicit message does not contain a Rapid Commit option.
{ The DHCPv6 server does not support rapid assignment even though the Solicit message
contains a Rapid Commit option.
3. The DHCPv6 client might receive multiple Advertise messages offered by different DHCPv6
servers. It selects an offer according to the receiving sequence and server priority, and sends a
Request message to the selected server for confirmation.
4. The DHCPv6 server sends a Reply message to the client, confirming that the address/prefix
and other configuration parameters are assigned to the client.
Figure 93 Assignment involving four messages
Address/prefix lease renewal
An IPv6 address/prefix assigned by a DHCPv6 server has a valid lifetime. After the valid lifetime
expires, the DHCPv6 client cannot use the IPv6 address/prefix. To use the IPv6 address/prefix, the
DHCPv6 client must renew the lease time.
Figure 94 Using the Renew message for address/prefix lease renewal
As shown in Figure 94, at T1, the DHCPv6 client sends a Renew message to the DHCPv6 server.
The recommended value of T1 is half the preferred lifetime. The DHCPv6 server responds with a
Reply message, informing the client whether the lease is renewed.
Figure 95 Using the Rebind message for address/prefix lease renewal
As shown in Figure 95:
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