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Example for Configuring a 6to4 Tunnel

Networking Requirements

As shown in Figure 1, SwitchA and SwitchB connect to a 6to4 network, respectively. SwitchA and SwitchB are 6to4 switches and connect to SwitchC deployed on an IPv4 backbone network. A 6to4 tunnel needs to be set up between SwitchA and SwitchB so that the two IPv6 hosts connected to SwitchA and SwitchB can communicate with each other over the IPv4 backbone network.

Figure 1 Networking diagram for configuring a 6to4 tunnel

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure the IPv4 network. Configure IPv4 addresses and static routes for interfaces so that SwitchA, SwitchB, and SwitchC can communicate with each other.

  2. Configure IPv6 networks. Configure IPv6 addresses of SwitchA and SwitchB to ensure that SwitchA and SwitchB can communicate with the connected IPv6 hosts.

  3. Configure a 6to4 tunnel. Configure IPv6 addresses, protocol types, source interfaces, and destination addresses for tunnel interfaces so that IPv6 packets can be forwarded on the IPv4 backbone network.

  4. Configure a static route for forwarding IPv6 packets to the 6to4 tunnel.

Procedure

  1. Configure the IPv4 backbone network.

    # Configure SwitchA.

    <HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 100
[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type hybrid
[SwitchA-GigabitEthernet0/0/1] port hybrid pvid vlan 100
[SwitchA-GigabitEthernet0/0/1] port hybrid untagged vlan 100
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface vlanif 100
[SwitchA-Vlanif100] ip address 10.1.1.1 24
[SwitchA-Vlanif100] quit
[SwitchA] ip route-static 10.3.1.2 255.255.255.0 10.1.1.2

    # Configure SwitchB.

    <HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] vlan batch 300
[SwitchB] interface gigabitethernet0/0/1
[SwitchB-GigabitEthernet0/0/1] port link-type hybrid
[SwitchB-GigabitEthernet0/0/1] port hybrid pvid vlan 300
[SwitchB-GigabitEthernet0/0/1] port hybrid untagged vlan 300
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface vlanif 300
[SwitchB-Vlanif300] ip address 10.3.1.2 24
[SwitchB-Vlanif300] quit
[SwitchB] ip route-static 10.1.1.1 255.255.255.0 10.3.1.1

    # Configure SwitchC.

    <HUAWEI> system-view
[HUAWEI] sysname SwitchC
[SwitchC] vlan batch 100 300
[SwitchC] interface vlanif 100
[SwitchC-Vlanif100] ip address 10.1.1.2 24
[SwitchC-Vlanif100] quit
[SwitchC] interface vlanif 300
[SwitchC-Vlanif300] ip address 10.3.1.1 24
[SwitchC-Vlanif300] quit
[SwitchC] interface gigabitethernet0/0/1
[SwitchC-GigabitEthernet0/0/1] port link-type hybrid
[SwitchC-GigabitEthernet0/0/1] port hybrid pvid vlan 100
[SwitchC-GigabitEthernet0/0/1] port hybrid untagged vlan 100
[SwitchC-GigabitEthernet0/0/1] quit
[SwitchC] interface gigabitethernet0/0/2
[SwitchC-GigabitEthernet0/0/2] port link-type hybrid
[SwitchC-GigabitEthernet0/0/2] port hybrid pvid vlan 300
[SwitchC-GigabitEthernet0/0/2] port hybrid untagged vlan 300
[SwitchC-GigabitEthernet0/0/2] quit

  2. Configure IPv6 networks.

    # Configure SwitchA.

    [SwitchA] ipv6
[SwitchA] vlan batch 200
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] port link-type hybrid
[SwitchA-GigabitEthernet0/0/2] port hybrid pvid vlan 200
[SwitchA-GigabitEthernet0/0/2] port hybrid untagged vlan 200
[SwitchA-GigabitEthernet0/0/2] quit
[SwitchA] interface vlanif 200
[SwitchA-Vlanif200] ipv6 enable
[SwitchA-Vlanif200] ipv6 address 2002:0a01:0101:1::1/64
[SwitchA-Vlanif200] quit

    # Configure SwitchB.

    [SwitchB] ipv6
[SwitchB] vlan batch 200
[SwitchB] interface gigabitethernet0/0/2
[SwitchB-GigabitEthernet0/0/2] port link-type hybrid
[SwitchB-GigabitEthernet0/0/2] port hybrid pvid vlan 200
[SwitchB-GigabitEthernet0/0/2] port hybrid untagged vlan 200
[SwitchB-GigabitEthernet0/0/2] quit
[SwitchB] interface vlanif 200
[SwitchB-Vlanif200] ipv6 enable
[SwitchB-Vlanif200] ipv6 address 2002:0a03:0102:1::1/64
[SwitchB-Vlanif200] quit

    # Configure the IPv6 hosts.

    Set the IPv6 addresses of PC1 and PC2 to 2002:A01:101:1::2/64 and 2002:A03:102:1::2/64, respectively. Set the gateway IPv6 addresses of PC1 and PC2 to 2002:A01:101:1::1 and 2002:A03:102:1::1, respectively.

  3. Enable the service loopback function on an Eth-Trunk.

    The interface must be idle and not transmitting services.

    After the service loopback function is enabled on the Eth-Trunk, the physical interfaces added to the Eth-Trunk must be in the Up state. Otherwise, the link layer protocol of the tunnel interface cannot run properly.

    # Configure SwitchA.

    [SwitchA] interface eth-trunk 1
[SwitchA-Eth-Trunk1] service type tunnel
[SwitchA-Eth-Trunk1] quit
[SwitchA] interface gigabitethernet 0/0/3
[SwitchA-GigabitEthernet0/0/3] eth-trunk 1
[SwitchA-GigabitEthernet0/0/3] quit

    # Configure SwitchB.

    [SwitchB] interface eth-trunk 1
[SwitchB-Eth-Trunk1] service type tunnel
[SwitchB-Eth-Trunk1] quit
[SwitchB] interface gigabitethernet 0/0/3
[SwitchB-GigabitEthernet0/0/3] eth-trunk 1
[SwitchB-GigabitEthernet0/0/3] quit

  4. Configure a 6to4 tunnel.

    You only need to specify the source address of the tunnel when a 6to4 tunnel is configured. The destination address of the tunnel is the destination address of the original IPv6 packet.

    # Configure SwitchA.

    [SwitchA] interface tunnel 1
[SwitchA-Tunnel1] tunnel-protocol ipv6-ipv4 6to4
[SwitchA-Tunnel1] eth-trunk 1
[SwitchA-Tunnel1] ipv6 enable
[SwitchA-Tunnel1] ipv6 address 2002:0a01:0101::1/64
[SwitchA-Tunnel1] source vlanif 100
[SwitchA-Tunnel1] quit

    # Configure SwitchB.

    [SwitchB] interface tunnel 1
[SwitchB-Tunnel1] eth-trunk 1
[SwitchB-Tunnel1] tunnel-protocol ipv6-ipv4 6to4
[SwitchB-Tunnel1] ipv6 enable
[SwitchB-Tunnel1] ipv6 address 2002:0a03:0102::1/64
[SwitchB-Tunnel1] source vlanif 300
[SwitchB-Tunnel1] quit

  5. Configure a static route for forwarding IPv6 packets to the 6to4 tunnel.

    # Configure SwitchA.

    [SwitchA] ipv6 route-static 2002:: 16 tunnel 1

    # Configure SwitchB.

    [SwitchB] ipv6 route-static 2002:: 16 tunnel 1

  6. Verify the configuration.

    # Check the IPv6 status of Tunnel1 on SwitchA.

    [SwitchA] display ipv6 interface tunnel 1
Tunnel1 current state : UP
IPv6 protocol current state : UP
IPv6 is enabled, link-local address is FE80::244:1FF:FE41:5410
  Global unicast address(es):
    2002:A01:101::1, subnet is 2002:A01:101::/64
  Joined group address(es):
    FF02::1:FF00:1
    FF02::1:FF41:5410
    FF02::2
    FF02::1
  MTU is 1500 bytes
  ND reachable time is 30000 milliseconds
  ND retransmit interval is 1000 milliseconds
  ND stale time is 1200 seconds

    You can see that the tunnel status is UP.

    # Ping the 6to4 address of the tunnel interface on SwitchB from SwitchA.

    [SwitchA] ping ipv6 2002:0a03:0102::1
  PING 2002:0a03:0102::1 : 56  data bytes, press CTRL_C to break
    Reply from 2002:A03:102::1
    bytes=56 Sequence=1 hop limit=64  time = 8 ms
    Reply from 2002:A03:102::1
    bytes=56 Sequence=2 hop limit=64  time = 25 ms
    Reply from 2002:A03:102::1
    bytes=56 Sequence=3 hop limit=64  time = 4 ms
    Reply from 2002:A03:102::1
    bytes=56 Sequence=4 hop limit=64  time = 5 ms
    Reply from 2002:A03:102::1
    bytes=56 Sequence=5 hop limit=64  time = 5 ms

  --- 2002:0a03:0102::1 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 4/9/25 ms

    The 6to4 address can be pinged successfully.

    # PC1 and PC2 can ping each other.

Configuration Files

  • SwitchA configuration file

    #
sysname SwitchA
#
ipv6
#
vlan batch 100 200
#
interface Vlanif100
 ip address 10.1.1.1 255.255.255.0
#
interface Vlanif200
 ipv6 enable
 ipv6 address 2002:A01:101:1::1/64
#
interface Eth-Trunk1
 service type tunnel
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 port hybrid pvid vlan 100
 port hybrid untagged vlan 100
#
interface GigabitEthernet0/0/2
 port link-type hybrid
 port hybrid pvid vlan 200
 port hybrid untagged vlan 200
#
interface GigabitEthernet0/0/3
 eth-trunk 1
#
interface Tunnel1
 ipv6 enable
 ipv6 address 2002:A01:101::1/64
 tunnel-protocol ipv6-ipv4 6to4
 source Vlanif100
 eth-trunk 1
#
ip route-static 10.3.1.0 255.255.255.0 10.1.1.2
#
ipv6 route-static 2002:: 16 Tunnel1
#
return

  • SwitchB configuration file

    #
sysname SwitchB
#
ipv6
#
vlan batch 200 300
#
interface Vlanif200
 ipv6 enable
 ipv6 address 2002:A03:102:1::1/64
#
interface Vlanif300
 ip address 10.3.1.2 255.255.255.0
#
interface Eth-Trunk1
 service type tunnel
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 port hybrid pvid vlan 300
 port hybrid untagged vlan 300
#
interface GigabitEthernet0/0/2
 port link-type hybrid
 port hybrid pvid vlan 200
 port hybrid untagged vlan 200
#
interface GigabitEthernet0/0/3
 eth-trunk 1
#
interface Tunnel1
 ipv6 enable
 ipv6 address 2002:A03:102::1/64
 tunnel-protocol ipv6-ipv4 6to4
 source Vlanif300
 eth-trunk 1
#
ip route-static 10.1.1.0 255.255.255.0 10.3.1.1
#
ipv6 route-static 2002:: 16 Tunnel1
#
return

  • SwitchC configuration file

    #
sysname SwitchC
#
vlan batch 100 300
#
interface Vlanif100
 ip address 10.1.1.2 255.255.255.0
#
interface Vlanif300
 ip address 10.3.1.1 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 port hybrid pvid vlan 100
 port hybrid untagged vlan 100
#
interface GigabitEthernet0/0/2
 port link-type hybrid
 port hybrid pvid vlan 300
 port hybrid untagged vlan 300
#
return
Parent Topic: Configuration Examples for IPv6 over IPv4 Tunnels
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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