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Figure 1-4 Operating process of a DHCPv6 relay agent 
(1) DHCPv6 message from client
(4) DHCPv6 message to client
DHCPv6 client
DHCPv6 relay agent
DHCPv6 server
(2) Relay-forward
(3) Relay-reply
 
 
As shown in 
, the DHCPv6 relay agent works as follows: 
1)  The DHCPv6 client sends a request to the multicast address FF02::1:2 of all the DHCPv6 servers 
and relay agents. 
2)  After receiving the request, the DHCPv6 relay agent encapsulates the request into the Relay 
Message Option of a Relay-forward message, and sends the message to the DHCPv6 server. 
3)  After obtaining the request from the Relay-forward message, the DHCPv6 server selects an IPv6 
address and other required parameters and adds them into a reply which is encapsulated into the 
Relay Message Option of a Relay-reply message. The DHCPv6 server then sends the Relay-reply 
message to the DHCPv6 relay agent. 
4)  The DHCPv6 relay agent obtains the reply from the Relay-reply message and sends the reply to 
the DHCPv6 client. 
The DHCPv6 client uses the IPv6 address and other network parameters assigned by the DHCPv6 
server to perform network configuration. 
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 
Configuring the DHCPv6 Client 
Configuration Prerequisites 
To make the DHCPv6 client obtain network configuration parameters through stateless DHCPv6 
configuration successfully, make sure that the DHCPv6 server is usable. 
Configuration Procedure 
Follow these steps to configure the DHCPv6 client: 
To do… 
Use the command… 
Remarks 
Enter system view 
system-view 
— 
Enable the IPv6 packet forwarding function
ipv6 
Required 
Enter interface view 
interface interface-type 
interface-number
 
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