A10E/A28E/A28F Configuration Guide
2.3.9 Example for configuring basic QinQ
Networking requirements
As shown in Figure 2-4, Switch A and Switch B are connected to VLAN 100 and VLAN 200
respectively. Department C and department E need to communicate through the carrier
network. Department D and Department F need to communicate, too. Thus, you need to set
the outer Tag to VLAN 1000. Set Port 2 and Port 3 to dot1q-tunnel mode on Switch A and
Switch B, and connect these two interfaces two different VLANs. Port 1 is the uplink
interface connected to the ISP, and it is set to the Trunk mode to allow double Tag packets to
pass. The carrier TPID is 9100.
Figure 2-4 Basic QinQ networking application
Configuration steps
Step 1 Create VLAN 100, VLAN 200, and VLAN 1000 and activate them. TPID is 9100.
Configure Switch A.
Alpha-A28E#hostname SwitchA
SwitchA#config
SwitchA(config)#mls double-tagging tpid 9100
SwitchA(config)#create vlan 100,200,1000 active
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