Lsw3及Lsw4 为运营商设备 其他为客户的设备
LSW3设备配置

interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 200

interface GigabitEthernet0/0/2
qinq vlan-translation enable 在isp入接口开启qinq的vlan映射功能
port hybrid untagged vlan 200
port vlan-stacking vlan 10 stack-vlan 200 客户网络中的vlan10的外层打上isp网络的vlan200的tag
port vlan-stacking vlan 20 stack-vlan 200 客户网络中的vlan20的外层打上isp网络的vlan200的tag

LSW4配置

interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 200

interface GigabitEthernet0/0/2
qinq vlan-translation enable
port hybrid untagged vlan 200
port vlan-stacking vlan 10 stack-vlan 200
port vlan-stacking vlan 20 stack-vlan 200

LSW1设备配置

interface Vlanif10
ip address 192.168.1.1 255.255.255.0

interface Vlanif20
ip address 192.168.2.1 255.255.255.0

interface MEth0/0/1

interface GigabitEthernet0/0/1

interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 10 20

interface GigabitEthernet0/0/3
port link-type access
port default vlan 10

interface GigabitEthernet0/0/4
port link-type access
port default vlan 20

pc1（192.168.1.2） ping pc3（192.168.1.3）