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DES-7200 Configuration Guide Chapter 12 QinQ Configuration
12-4
Figure 3 Learn MAC address of flexible QinQ packet
As shown in the above figure, the switch connects to user network through
dot1q-tunnel port, on which VLAN 4 is set to be native VLAN. The packets of
VLAN 3 are encapsualted with VLAN 5 tag as outer tag. When the switch
receives a parcket from VLAN 3, it adds VLAN 5 tag as outer tag to the packet.
Meanwhile, VLAN 4 learns MAC-A for the native VLAN of the receiving port is
VLAN 4. Howover, VLAN 5 has not learned MAC-A and the packet is flooded.
To solve the problem on flooding the packets back from the public network,
duplicate the MAC address of native VLAN to the VLAN whether outer tag
locates. Similarly, you can execute reverse MAC address duplication to solve
the problem on flooding the packets to the public network.
12.1.3.3 Layer 2 protocol transparent
transmission
Layer 2 packet transparent transmission enables transmitting Layer 2 packets
between networks without influencing ISP networks. When Layer 2 protocol
packets arrive at the edge device on one side, the destination MAC address is