Stateless Dhcpv6 Configuration; Introduction - HP A5120 EI Series Configuration Manual

Figure 61 Using the Rebind message for address/prefix lease renewal
DHCPv6 client
T1
T2
As shown in
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 the chapter ―IPv6 basics
configuration.‖

Stateless DHCPv6 configuration

Introduction

After obtaining an IPv6 address/prefix, a switch 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 switch 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 the chapter
―IPv6 basics configuration.‖
DHCPv6 server
(1) Renew
...
...
(2) Rebind
(3) Reply
Figure 61, if the DHCPv6 client receives no response from the DHCPv6 server after sending
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