3Com Switch 8800 Family Configuration Guide

20
BPDU TUNNEL CONFIGURATION
BPDU Tunnel
Overview
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
Configuring BPDU
Tunnel
The following table describes the BPDU Tunnel configuration tasks.
Enabling/disabling BPDU
Tunnel
Perform the following configuration in system view.
Network BNetwork A
Network
Operator
Network BNetwork A
Network
Operator’s Network
User Network
Packet ingress/egress
device
Packet ingress/egress
device
Network BNetwork A
Network
Operator
Network BNetwork A
Network
Operator’s Network
User Network
Packet ingress/egress
device
Packet ingress/egress
device
Tab le 140 Configure BPDU Tunnel
Operation Command Description
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