Dynamic IPv6 address assignment configuration example

As shown in Figure 73, Switch A acts as a DHCPv6 server to assign IPv6 addresses to the clients on subnets 1::1:0:0:0/96 and 1::2:0:0:0/96.

On Switch A, configure the IPv6 address 1::1:0:0:1/96 for VLAN-interface 10 and 1::2:0:0:1/96 for VLAN-interface 20. The lease duration of the addresses on subnet 1::1:0:0:0/96 is 172800 seconds (two days), the valid time is 345600 seconds (four days), the domain name suffix is aabbcc.com, and the DNS server address is 1::1:0:0:2/96. The lease duration of the addresses on subnet 1::2:0:0:0/96 is 432000 seconds (five days), the valid time is 864000 seconds (ten days), the domain name is aabbcc.com, and the DNS server address is 1::2:0:0:2/96.

1. Configure the interfaces on the DHCPv6 server:

   # Specify an IPv6 address for VLAN-interface 10.

   <SwitchA> system-view
   [SwitchA] interface vlan-interface 10
   [SwitchA-Vlan-interface10] ipv6 address 1::1:0:0:1/96
   

   # Disable RA message suppression on VLAN-interface 10.

   [SwitchA-Vlan-interface10] undo ipv6 nd ra halt
   

   # Set the M flag to 1 in RA advertisements to be sent on VLAN-interface 10. Hosts that receive the RA advertisements will obtain IPv6 addresses through DHCPv6.

   [SwitchA-Vlan-interface10] ipv6 nd autoconfig managed-address-flag
   

   # Set the O flag to 1 in RA advertisements to be sent on VLAN-interface 10. Hosts that receive the RA advertisements will obtain information other than IPv6 address through DHCPv6.

   [SwitchA-Vlan-interface10] ipv6 nd autoconfig other-flag
   [SwitchA-Vlan-interface10] quit
   

   # Specify an IPv6 address for VLAN-interface 20.

   [SwitchA] interface vlan-interface 20
   [SwitchA-Vlan-interface20] ipv6 address 1::2:0:0:1/96
   

   # Disable RA message suppression on VLAN-interface 20.

   [SwitchA-Vlan-interface20] undo ipv6 nd ra halt
   

   # Set the M flag to 1 in RA advertisements to be sent on VLAN-interface 20. Hosts that receive the RA advertisements will obtain IPv6 addresses through DHCPv6.

   [SwitchA-Vlan-interface20] ipv6 nd autoconfig managed-address-flag
   

   # Set the O flag to 1 in RA advertisements to be sent on VLAN-interface 20. Hosts that receive the RA advertisements will obtain information other than IPv6 address through DHCPv6.

   [SwitchA-Vlan-interface20] ipv6 nd autoconfig other-flag
   [SwitchA-Vlan-interface20] quit
   

2. Enable DHCPv6:

   # Enable DHCPv6 server on VLAN-interface 10 and VLAN-interface 20.

   [SwitchA] interface vlan-interface 10
   [SwitchA-Vlan-interface10] ipv6 dhcp select server
   [SwitchA-Vlan-interface10] quit
   [SwitchA] interface vlan-interface 20
   [SwitchA-Vlan-interface20] ipv6 dhcp select server
   [SwitchA-Vlan-interface20] quit
   

   # Exclude the DNS server addresses from dynamic assignment.

   [SwitchA] ipv6 dhcp server forbidden-address 1::1:0:0:2
   [SwitchA] ipv6 dhcp server forbidden-address 1::2:0:0:2
   

   # Configure the DHCPv6 address pool 1 to assign IPv6 addresses and other configuration parameters to clients on subnet 1::1:0:0:0/96.

   [SwitchA] ipv6 dhcp pool 1
   [SwitchA-dhcp6-pool-1] network 1::1:0:0:0/96 preferred-lifetime 172800 valid-lifetime 345600
   [SwitchA-dhcp6-pool-1] domain-name aabbcc.com
   [SwitchA-dhcp6-pool-1] dns-server 1::1:0:0:2
   [SwitchA-dhcp6-pool-1] quit
   

   # Configure the DHCPv6 address pool 2 to assign IPv6 addresses and other configuration parameters to clients on subnet 1::2:0:0:0/96.

   [SwitchA] ipv6 dhcp pool 2
   [SwitchA-dhcp6-pool-2] network 1::2:0:0:0/96 preferred-lifetime 432000 valid-lifetime 864000
   [SwitchA-dhcp6-pool-2] domain-name aabbcc.com
   [SwitchA-dhcp6-pool-2] dns-server 1::2:0:0:2
   [SwitchA-dhcp6-pool-2] quit
   

# Verify that the clients on subnets 1::1:0:0:0/96 and 1::2:0:0:0/96 can obtain IPv6 addresses and all other configuration parameters from the DHCPv6 server (Switch A). (Details not shown.)

# On the DHCPv6 server, display IPv6 addresses assigned to the DHCPv6 clients.

[SwitchA] display ipv6 dhcp server ip-in-use