H3C LS-3100-52P-OVS-H3 Operation Manual page 180

Figure 1-1 Network hierarchy of BPDU tunneling
At the input side of the service provider network, the edge device changes the destination MAC
address of a BPDU from a customer network from 0x0180-C200-0000 to a special multicast MAC
address, 0x010F-E200-0003 by default. In the service provider's network, the modified BPDUs are
forwarded as data packets in the user VLAN.
At the output side of the service provider network, the edge device recognizes the BPDU with the
destination MAC address of 0x010F-E200-0003 and restores its original destination MAC address
0x0180-C200-0000. Then, the device removes the outer VLAN tag, and sends the BPDU to the
destination customer network.
Make sure, through configuration, that the VLAN tag of the BPDU is neither changed nor removed
during its transparent transmission in the service provider network; otherwise, the system will fail to
transparently transmit the customer network BPDU correctly.
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