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BPDU Tunnel enables geographically segmented user networks to transmit BPDU 
packets transparently over the specified VLAN VPN on the operator’s network. This 
allows the user network to participate in a uniform spanning tree calculation while 
maintaining a separate spanning tree from the operator network.

As shown in Figure 36, the operator’s network comprises packet ingress/egress 
devices, and the user network has networks A and B. On the operator’s network, 
you can configure to convert the MAC addresses of the arriving BPDU packets to a 
special format at the ingress, and then reconvert them at the egress. This is how 
transparent transmission is implemented on the operator’s network.

Figure 36   BPDU Tunnel implementation

The following table describes the BPDU Tunnel configuration tasks.

Perform the following configuration in system view.

Network B

Network A

Network

Network B

Network A

Network

Packet ingress/egress 
device

Packet ingress/egress 
device

Network B

Network A

Network

Network B

Network A

Network

Packet ingress/egress 
device

Packet ingress/egress 
device

Table 140   Configure BPDU Tunnel

Enter system view 

system-view 

- 

Enable BPDU TUNNEL 
function of the system 

vlan-vpn tunnel 

Configure BPDU TUNNEL 
function, required 

Enter Ethernet port view 

interface interface-type 
interface-number 

- 

Enable VLAN VPN function on 
the Ethernet port 

vlan-vpn enable 

Enable VLAN VPN function on 
the Ethernet port, required