H3C Technologies H3C S12500 Series Switches - Manual (Page 181)

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Figure 69 Using the Rebind message for address/prefix lease renewal
As shown in Figure 69 , 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.
For more information about the valid lifetime and the preferred lifetime, see "Configuring IPv6 basics."
Protocols and standards
• RFC 3736, Stateless Dynamic Host Configuration Protocol (DHCP) Service for IPv6
• RFC 3315, Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
• RFC 2462, IPv6 Stateless Address Autoconfiguration
• RFC 3633, IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6