Example for Configuring VLAN ID-based 2 to 2 VLAN Mapping

Networking Requirements

QinQ is used to send double-tagged packets, which prevents the conflict between C-VLAN IDs and S-VLAN IDs and differentiates services and users. However, the interface will discard the packets because C-VLAN IDs are different from S-VLAN IDs. To ensure communication continuity, configure 2:2 VLAN mapping on the PE and replace double C-VLAN tags with double S-VLAN tags.

In Figure 1, users send double-tagged packets to the ISP network. These packets cannot be sent successfully because the VLAN IDs are different from the S-VLAN IDs. To solve this problem, ensure that the users of the Switch5 and Switch6 can communicate.

Figure 1 Networking diagram for configuring 2:2 VLAN mapping

Configuration Roadmap

The configuration roadmap is as follows:

Add switch ports connecting to users to VLAN 10 and VLAN 30.
Configure the QinQ function on Switch1 and Switch4 so that packets sent to the ISP network are double-tagged.
Configure 2:2 VLAN mapping on switches connected to the ISP network.

Procedure

Add downlink interfaces on switches to specified VLANs.

# Configure Switch5.

<HUAWEI> system-view
[HUAWEI] sysname Switch5
[Switch5] vlan 10
[Switch5-vlan10] quit
[Switch5] interface gigabitethernet 0/0/1
[Switch5-GigabitEthernet0/0/1] port link-type access
[Switch5-GigabitEthernet0/0/1] port default vlan 10
[Switch5-GigabitEthernet0/0/1] quit
[Switch5] interface gigabitethernet 0/0/2
[Switch5-GigabitEthernet0/0/2] port link-type trunk
[Switch5-GigabitEthernet0/0/2] port trunk allow-pass vlan 10

# Configure Switch6.

<HUAWEI> system-view
[HUAWEI] sysname Switch6
[Switch6] vlan 30
[Switch6-vlan30] quit
[Switch6] interface gigabitethernet 0/0/1
[Switch6-GigabitEthernet0/0/1] port link-type access
[Switch6-GigabitEthernet0/0/1] port default vlan 30
[Switch6-GigabitEthernet0/0/1] quit
[Switch6] interface gigabitethernet 0/0/2
[Switch6-GigabitEthernet0/0/2] port link-type trunk
[Switch6-GigabitEthernet0/0/2] port trunk allow-pass vlan 30

Configure the QinQ function on Switch1 and Switch4 so that packets sent to the ISP network are double-tagged.

# Configure Switch 1.

<HUAWEI> system-view
[HUAWEI] sysname Switch1
[Switch1] vlan 20
[Switch1-vlan20] quit
[Switch1] interface gigabitethernet 0/0/1
[Switch1-GigabitEthernet0/0/1] port link-type hybrid
[Switch1-GigabitEthernet0/0/1] port hybrid untagged vlan 20
[Switch1-GigabitEthernet0/0/1] qinq vlan-translation enable
[Switch1-GigabitEthernet0/0/1] port vlan-stacking vlan 10 stack-vlan 20
[Switch1-GigabitEthernet0/0/1] quit
[Switch1] interface gigabitethernet 0/0/2
[Switch1-GigabitEthernet0/0/2] port link-type trunk
[Switch1-GigabitEthernet0/0/2] port trunk allow-pass vlan 20
[Switch1-GigabitEthernet0/0/2] quit

# Configure Switch 4.

<HUAWEI> system-view
[HUAWEI] sysname Switch4
[Switch4] vlan 40
[Switch4-vlan40] quit
[Switch4] interface gigabitethernet 0/0/1
[Switch4-GigabitEthernet0/0/1] port link-type hybrid
[Switch4-GigabitEthernet0/0/1] port hybrid untagged vlan 40
[Switch4-GigabitEthernet0/0/1] qinq vlan-translation enable
[Switch4-GigabitEthernet0/0/1] port vlan-stacking vlan 30 stack-vlan 40
[Switch4-GigabitEthernet0/0/1] quit
[Switch4] interface gigabitethernet 0/0/2
[Switch4-GigabitEthernet0/0/2] port link-type trunk
[Switch4-GigabitEthernet0/0/2] port trunk allow-pass vlan 40
[Switch4-GigabitEthernet0/0/2] quit

Configure 2:2 VLAN mapping on the switch connecting to the ISP network.

# Configure Switch2.

<HUAWEI> system-view
[HUAWEI] sysname Switch2
[Switch2] interface gigabitethernet 0/0/1
[Switch2-GigabitEthernet0/0/1] port link-type hybrid
[Switch2-GigabitEthernet0/0/1] port hybrid tagged vlan 50
[Switch2-GigabitEthernet0/0/1] qinq vlan-translation enable
[Switch2-GigabitEthernet0/0/1] port vlan-mapping vlan 20 inner-vlan 10 map-vlan 50 map-inner-vlan 60

# Configure Switch3.

<HUAWEI> system-view
[HUAWEI] sysname Switch3
[Switch3] interface gigabitethernet 0/0/1
[Switch3-GigabitEthernet0/0/1] port link-type hybrid
[Switch3-GigabitEthernet0/0/1] port hybrid tagged vlan 50
[Switch3-GigabitEthernet0/0/1] qinq vlan-translation enable
[Switch3-GigabitEthernet0/0/1] port vlan-mapping vlan 40 inner-vlan 30 map-vlan 50 map-inner-vlan 60

Verify the configurations.
Verify that users connected to Switch5 and users connected to Switch6 can communicate with each other.

Configuration Files

Switch1 configuration file

#
sysname Switch1
#
vlan batch 20
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 qinq vlan-translation enable
 port hybrid untagged vlan 20
 port vlan-stacking vlan 10 stack-vlan 20
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
return

Switch2 configuration file

#
sysname Switch2
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 qinq vlan-translation enable
 port hybrid tagged vlan 50
 port vlan-mapping vlan 20 inner-vlan 10 map-vlan 50 map-inner-vlan 60
#
return

Switch3 configuration file

#
sysname Switch3
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 qinq vlan-translation enable
 port hybrid tagged vlan 50
 port vlan-mapping vlan 40 inner-vlan 30 map-vlan 50 map-inner-vlan 60
#
return

Switch4 configuration file

#
sysname Switch4
#
vlan batch 40
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 qinq vlan-translation enable
 port hybrid untagged vlan 40
 port vlan-stacking vlan 30 stack-vlan 40
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 40
#
return

Switch5 configuration file

#
sysname Switch5
#
vlan batch 10
#
interface GigabitEthernet0/0/1
 port link-type access
 port default vlan 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10
#
return

Switch6 configuration file

#
sysname Switch6
#
vlan batch 30
#
interface GigabitEthernet0/0/1
 port link-type access
 port default vlan 30
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
return