H3C Technologies H3C SecPath F1000-E - Manual (Page 734)

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Figure 364 Using the Rebind message for address/prefix lease renewal
As shown in Figure 364 , if the DHCPv6 client receives no response from the DHCPv6 server after sending
out a Renew message at T1, it multicasts a Rebind message to all DHCPv6 servers at T2 (that is, when 80%
preferred lifetime expires). Then the DHCPv6 server responds with a Reply message, informing that the
lease is renewed or not.
If the DHCPv6 client receives no response from the DHCPv6 servers, the client stops using the
address/prefix when the valid lifetime expires.
NOTE:
For more information about the valid lifetime and the preferred lifetime, see "Configuring IPv6 basics."
Stateless DHCPv6 configuration
Introduction
After obtaining an IPv6 address/prefix, the firewall can use stateless DHCPv6 to obtain other
configuration parameters from a DHCPv6 server. This application is called stateless DHCPv6
configuration.
With an IPv6 address obtained through stateless address autoconfiguration, the firewall automatically
enables the stateless DHCPv6 function after it receives an RA message with the managed address
configuration flag (M flag) set to 0 and with the other stateful configuration flag (O flag) set to 1.
NOTE:
Stateless address autoconfiguration means that a node automatically generates an IPv6 address based on
the information obtained through router/prefix discovery. For more information, see "Configuring IPv6
basics."