HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 116

Configuring stateless DHCPv6, Operation

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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." Figure 52 Using the Rebind message for address/prefix lease renewal Configuring stateless DHCPv6 After obtaining an IPv6 address/prefix, a device 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, a device 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. 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." Operation Figure 53 Operation of stateless DHCPv6 As shown in Figure 53, stateless DHCPv6 operates in the following steps: 1. The DHCPv6 client multicasts 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, specifying the configuration parameters that the client requests from the DHCPv6 server. 2. After receiving the Information-request message, the DHCPv6 server returns 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 performs network configuration with the 108

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108
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
."
Figure 52
Using the Rebind message for address/prefix lease renewal
Configuring stateless DHCPv6
After obtaining an IPv6 address/prefix, a device 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, a device 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.
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
."
Operation
Figure 53
Operation of stateless DHCPv6
As shown in
Figure 53
, stateless DHCPv6 operates in the following steps:
1.
The DHCPv6 client multicasts 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, specifying the configuration parameters that the client requests from the DHCPv6
server.
2.
After receiving the Information-request message, the DHCPv6 server returns 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 performs network configuration with the