Configuration example

As shown in Figure 89, two 6to4 networks are connected to an IPv4 network through two 6to4 switches (Switch A and Switch B). Configure a 6to4 tunnel to make Host A and Host B reachable to each other.

To enable communication between 6to4 networks, configure 6to4 addresses for 6to4 switches and hosts in the 6to4 networks.

• The IPv4 address of VLAN-interface 100 on Switch A is 2.1.1.1/24, and the corresponding 6to4 prefix is 2002:0201:0101::/48 after it is translated to an IPv6 address. Assign interface Tunnel 0 to subnet 2002:0201:0101::/64 and VLAN-interface 101 to subnet 2002:0201:0101:1::/64.

• The IPv4 address of VLAN-interface 100 on Switch B is 5.1.1.1/24, and the corresponding 6to4 prefix is 2002:0501:0101::/48 after it is translated to an IPv6 address. Assign interface Tunnel 0 to subnet 2002:0501:0101::/64 and VLAN-interface 101 to subnet 2002:0501:0101:1::/64.

Before configuring a 6to4 tunnel, make sure Switch A and Switch B have the corresponding VLAN interfaces created and are reachable to each other.

• Configure Switch A:

  # Enable IPv6.

  <SwitchA> system-view
  [SwitchA] ipv6
  

  # Specify an IPv4 address for VLAN-interface 100.

  [SwitchA] interface vlan-interface 100
  [SwitchA-Vlan-interface100] ip address 2.1.1.1 24
  [SwitchA-Vlan-interface100] quit
  

  # Specify an IPv6 address for VLAN-interface 101.

  [SwitchA] interface vlan-interface 101
  [SwitchA-Vlan-interface101] ipv6 address 2002:0201:0101:1::1/64
  [SwitchA-Vlan-interface101] quit
  

  # Create service loopback group 1 to support the tunnel service.

  [SwitchA] service-loopback group 1 type tunnel
  

  # Assign GigabitEthernet 1/0/3 to service loopback group 1, and disable STP, NDP, and LLDP on the interface.

  [SwitchA] interface GigabitEthernet 1/0/3
  [SwitchA-GigabitEthernet1/0/3] undo stp enable
  [SwitchA-GigabitEthernet1/0/3] undo ndp enable
  [SwitchA-GigabitEthernet1/0/3] undo lldp enable
  [SwitchA-GigabitEthernet1/0/3] port service-loopback group 1
  [SwitchA-GigabitEthernet1/0/3] quit
  

  # Configure a 6to4 tunnel.

  [SwitchA] interface tunnel 0
  [SwitchA-Tunnel0] ipv6 address 2002:201:101::1/64
  [SwitchA-Tunnel0] source vlan-interface 100
  [SwitchA-Tunnel0] tunnel-protocol ipv6-ipv4 6to4
  

  # Reference service loopback group 1 on the tunnel.

  [SwitchA-Tunnel0] service-loopback-group 1
  [SwitchA-Tunnel0] quit
  

  # Configure a static route whose destination address is 2002::/16 and next-hop is the tunnel interface.

  [SwitchA] ipv6 route-static 2002:: 16 tunnel 0
  

• Configure Switch B:

  # Enable IPv6.

  <SwitchB> system-view
  [SwitchB] ipv6
  

  # Specify an IPv4 address for VLAN-interface 100.

  [SwitchB] interface vlan-interface 100
  [SwitchB-Vlan-interface100] ip address 5.1.1.1 24
  [SwitchB-Vlan-interface100] quit
  

  # Specify an IPv6 address for VLAN-interface 101.

  [SwitchB] interface vlan-interface 101
  [SwitchB-Vlan-interface101] ipv6 address 2002:0501:0101:1::1/64
  [SwitchB-Vlan-interface101] quit
  

  # Create service loopback group 1 to support the tunnel service.

  [SwitchB] service-loopback group 1 type tunnel
  

  # Assign GigabitEthernet 1/0/3 to service loopback group 1, and disable STP, NDP, and LLDP on the interface.

  [SwitchB] interface GigabitEthernet 1/0/3
  [SwitchB-GigabitEthernet1/0/3] undo stp enable
  [SwitchB-GigabitEthernet1/0/3] undo ndp enable
  [SwitchB-GigabitEthernet1/0/3] undo lldp enable
  [SwitchB-GigabitEthernet1/0/3] port service-loopback group 1
  [SwitchB-GigabitEthernet1/0/3] quit
  

  # Configure the 6to4 tunnel.

  [SwitchB] interface tunnel 0
  [SwitchB-Tunnel0] ipv6 address 2002:0501:0101::1/64
  [SwitchB-Tunnel0] source vlan-interface 100
  [SwitchB-Tunnel0] tunnel-protocol ipv6-ipv4 6to4
  

  # Reference service loopback group 1 on the tunnel.

  [SwitchB-Tunnel0] service-loopback-group 1
  [SwitchB-Tunnel0] quit
  

  # Configure a static route whose destination address is 2002::/16 and the next hop is the tunnel interface.

  [SwitchB] ipv6 route-static 2002:: 16 tunnel 0
  

# Ping Host B from Host A or ping Host A from Host B.

D:\>ping6 -s 2002:201:101:1::2 2002:501:101:1::2

Pinging 2002:501:101:1::2
from 2002:201:101:1::2 with 32 bytes of data:

Reply from 2002:501:101:1::2: bytes=32 time=13ms
Reply from 2002:501:101:1::2: bytes=32 time=1ms
Reply from 2002:501:101:1::2: bytes=32 time=1ms
Reply from 2002:501:101:1::2: bytes=32 time<1ms

Ping statistics for 2002:501:101:1::2:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 13ms, Average = 3ms