Example: Configuring DHCPv6 relay agent

As shown in Figure 82, configure the DHCPv6 relay agent on Switch A to relay DHCPv6 packets between DHCPv6 clients and the DHCPv6 server.

Switch A acts as the gateway of network 1::/64. It sends RA messages to notify the hosts to obtain IPv6 addresses and other configuration parameters through DHCPv6. For more information about RA messages, see "Configuring basic IPv6 settings."

	IMPORTANT: By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

# Specify IPv6 addresses for VLAN-interface 2 and VLAN-interface 3.

<SwitchA> system-view
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] ipv6 address 2::1 64
[SwitchA-Vlan-interface2] quit
[SwitchA] interface vlan-interface 3
[SwitchA-Vlan-interface3] ipv6 address 1::1 64

# Disable RA message suppression on VLAN-interface 3.

[SwitchA-Vlan-interface3] undo ipv6 nd ra halt

# Set the M flag to 1 in RA advertisements to be sent on VLAN-interface 3. Hosts that receive the RA advertisements will obtain IPv6 addresses through DHCPv6.

[SwitchA-Vlan-interface3] ipv6 nd autoconfig managed-address-flag

# Set the O flag to 1 in RA advertisements to be sent on VLAN-interface 3. Hosts that receive the RA advertisements will obtain information other than IPv6 address through DHCPv6.

[SwitchA-Vlan-interface3] ipv6 nd autoconfig other-flag

# Enable the DHCPv6 relay agent on VLAN-interface 3 and specify the DHCPv6 server on the relay agent.

[SwitchA-Vlan-interface3] ipv6 dhcp select relay
[SwitchA-Vlan-interface3] ipv6 dhcp relay server-address 2::2

# Display DHCPv6 server address information on Switch A.

[SwitchA-Vlan-interface3] display ipv6 dhcp relay server-address
Interface: Vlan-interface3
 Server address                             Outgoing Interface
 2::2

# Display packet statistics on the DHCPv6 relay agent.

[SwitchA-Vlan-interface3] display ipv6 dhcp relay statistics
Packets dropped               :  0
Packets received              :  14
    Solicit                   :  0
    Request                   :  0
    Confirm                   :  0
    Renew                     :  0
    Rebind                    :  0
    Release                   :  0
    Decline                   :  0
    Information-request       :  7
    Relay-forward             :  0
    Relay-reply               :  7
Packets sent                  :  14
    Advertise                 :  0
    Reconfigure               :  0
    Reply                     :  7
    Relay-forward             :  7
    Relay-reply               :  0