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3com 5500-ei pwr Installation Instruction

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3-4 
  Note: 
z 
The BPDU Tunnel is unavailable to all the ports of a device if the device has the fabric feature 
enabled on one of its ports. 
z 
If BPDU tunnel transparent transmission is enabled for packets of a protocol, the protocol cannot 
be enabled on the port. For example, if you execute the bpdu-tunnel lacp command, the lacp 
enable command cannot be executed on the port.  
z 
The bpdu-tunnel stp command is mutually exclusive with the vlan-vpn tunnel command. Refer to 
MSTP part of this manual for details.  
z 
To enable BPDU tunnel transmission for PAGP packets, LACP packets and UDLD packets, make 
sure that the links the service provider provides are point-to-point links. Otherwise, these protocols 
cannot operate properly.  
z 
Because the NDP configuration and NTDP configuration cannot be synchronized to ports in an 
aggregation group, make sure that NDP and NTDP are not enabled on any port in an aggregation 
group before enabling the service provider network to use aggregation group to transmit HGMP 
packets through BPDU tunnels.  
z 
The  bpdu-tunnel cdp command is mutually exclusive with the voice vlan legacy command. 
Refer to Voice VLAN part of this manual for details.  
z 
If a BPDU-tunnel-enabled port receives a tunnel packet from the customer’s network, errors occur 
in the network and the tunnel packet will be dropped directly.  
 
Displaying and Maintaining BPDU Tunnel Configuration 
To do... 
Use the command... 
Remarks 
Display the private multicast MAC 
address used by the tunnel packets
display bpdu-tunnel 
Available in any view  
 
BPDU Tunnel Configuration Example 
Transmitting STP Packets Through a Tunnel 
Network requirements 
z 
Customer1 and Customer2 are devices operating in a customer network; Provider1 and Provider2 
are edge devices operating in the service provider network. The two devices receive data from the 
customer network by using Ethernet1/0/1 and Ethernet1/0/2 respectively.  
z 
Provider1 and Provider2 are connected through trunk links, which permit packets of all VLANs.  
z 
Enable the service provider network to transmit STP packets of the customer network through 
BPDU tunnel. The destination MAC address for tunnel packets is 010f-e233-8b22.  
z 
Enable the VLAN-VPN feature for the service provider network, and enable the service provider 
network to use VLAN 100 to transmit data packets of the customer network.