H3C Technologies H3C S5560 Series Switches - Manual (Page 184)

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For more information about the valid lifetime and the preferred lifetime, see " Configuring basic IPv6
settings ."
Stateless DHCPv6
Stateless DHCPv6 enables a device that has obtained an IPv6 address/prefix to get other configuration
parameters from a DHCPv6 server.
The device performs stateless DHCPv6 if an RA message with the following flags is received from the
router during stateless address autoconfiguration:
• The managed address configuration flag (M flag) is set to 0.
• The other stateful configuration flag (O flag) is set to 1.
For more information about stateless address autoconfiguration, see "Configuring IPv6 basics."
Figure 66 Stateless DHCPv6 operation
As shown in Figure 66 , stateless DHCPv6 operates in the following steps:
1. The DHCPv6 client sends an Information-request message to the multicast address of all DHCPv6
servers and DHCPv6 relay agents. The Information-request message contains an Option Request
option that specifies the requested configuration parameters.
2. The DHCPv6 server returns to the client a Reply message containing the requested configuration
parameters.
3. The client checks the Reply message. If the obtained configuration parameters match those
requested in the Information-request message, the client uses these parameters to complete
configuration. If not, the client ignores the configuration parameters. If the client receives multiple
replies with configuration parameters matching those requested in the Information-request
message, it uses the first received reply.
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