Example: Configuring IPv6 prefix acquisition

As shown in Figure 84, configure the switch to use DHCPv6 to obtain configuration parameters from the DHCPv6 server. The parameters include IPv6 prefix, DNS server address, domain name suffix, SIP server address, and SIP server domain name.

	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.

You must configure the DHCPv6 server first before configuring the DHCPv6 client. For information about configuring DHCPv6 server, see "Configuring the DHCPv6 server."

# Configure an IPv6 address for VLAN-interface 2 that is connected to the DHCPv6 server.

<Switch> system-view
[Switch] interface vlan-interface 2
[Switch-Vlan-interface2] ipv6 address 1::2/48

# Configure VLAN-interface 2 as a DHCPv6 client for IPv6 prefix acquisition. Configure the DHCPv6 client to support DHCPv6 rapid prefix assignment. Configure the DHCPv6 client to assign an ID to the obtained IPv6 prefix and create a dynamic DHCPv6 option group for saving configuration parameters.

[Switch-Vlan-interface2] ipv6 dhcp client pd 1 rapid-commit option-group 1
[Switch-Vlan-interface2] quit

# Verify that the DHCPv6 client has obtained an IPv6 prefix and other configuration parameters from the DHCPv6 server.

[Switch] display ipv6 dhcp client
Vlan-interface2:
  Type: Stateful client requesting prefix
    State: OPEN
    Client DUID: 0003000100e002000000
    Preferred server:
      Reachable via address: FE80::2E0:1FF:FE00:18
      Server DUID: 0003000100e001000000
    IA_PD: IAID 0x00000642, T1 50 sec, T2 80 sec 
      Prefix: 12:34::/48
        Preferred lifetime 100 sec, valid lifetime 200 sec
        Will expire on Feb 4 2014 at 15:37:20(80 seconds left)
    DNS server addresses: 
      2000::FF
    Domain name: 
      example.com
    SIP server addresses:
      2:2::4
    SIP server domain names:
      bbb.com

# Verify that the client has obtained an IPv6 prefix.

[Switch] display ipv6 prefix 1
Number: 1
Type  : Dynamic
Prefix: 12:34::/48
Preferred lifetime 100 sec, valid lifetime 200 sec

# After DHCPv6 server is enabled on the device, verify that configuration parameters are saved in a dynamic DHCPv6 option group.

[Switch] display ipv6 dhcp option-group 1
DHCPv6 option group: 1
  DNS server addresses:
    Type: Dynamic (DHCPv6 prefix allocation)
    Interface: Vlan-interface2
    2000::FF
  Domain name:
    Type: Dynamic (DHCPv6 prefix allocation)
    Interface: Vlan-interface2
    example.com
  SIP server addresses:
    Type: Dynamic (DHCPv6 prefix allocation)
    Interface: Vlan-interface2
    2:2::4
  SIP server domain names:
    Type: Dynamic (DHCPv6 prefix allocation)
    Interface: Vlan-interface2
    bbb.com