3Com Switch 7750 Configuration Guide

BPDU Tunnel Configuration 273
Figure 65 BPDU Tunnel network hierarchy
BPDU Tunnel
Configuration
Configuration prerequisites
MSTP is enabled on the current switch.
Configuration procedure
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■ The BPDU Tunnel function can only be enabled on devices with STP enabled.
■ The BPDU Tunnel function can only be enabled on access ports.
■ To enable the BPDU Tunnel function, make sure the links between operator’s
networks are trunk links.
■ If a fabric port exists on a switch, you cannot configure VLAN-VPN function on
any port of the switch.
■ As the VLAN-VPN function is unavailable on ports with 802.1x, GVRP, GMRP,
STP, or NTDP enabled, the BPDU Tunnel function is not applicable to these
ports.
Network
Network A Network B
Customer networks
Service provider network
Packet input/output
device
Packet input/output
device
Table 207 Configure the BPDU Tunnel function
Operation Command Description
Enter system view system-view -
Enable MSTP globally stp enable -
Enable the BPDU
Tunnel function
globally
vlan-vpn tunnel Required
Enter Ethernet port
view
interface interface-type
interface-number
Make sure that you enter the
Ethernet port view of the port for
which you want to enable the
BPDU Tunnel function.
Disable MSTP for the
port
stp disable -
Enable the VLAN VPN
function for the
Ethernet port
vlan-vpn enable Required
By default, the VLAN VPN function
is disabled on all ports.