3Com Switch 7750 Series
Command Reference Guide – MSTP Chapter 1 MSTP Configuration Commands
1-48
System View: return to User View with Ctrl+Z.
[3Com] stp region-configuration
[3Com-mst-region] vlan-mapping modulo 16
1.1.46 vlan-vpn tunnel Syntax
vlan-vpn tunnel
undo vlan-vpn tunnel
View
System view
Parameter
None
Description
Use the vlan-vpn tunnel command to enable the BPDU Tunnel function for a switch.
Use the undo vlan-vpn tunnel command to disable the BPDU Tunnel function.
The BPDU Tunnel function enables BPDUs to be transparently transmitted between
geographically dispersed user networks through specified VLAN VPNs in operator’s
networks, through which spanning trees can be generated across these user networks
and are independent of those of the operator’s network.
By default, the BPDU Tunnel function is disabled.
Note:
z The BPDU Tunnel function can only be enabled on devices with STP employed.
z The BPDU Tunnel function can only be enabled on access ports.
z To enable the BPDU Tunnel function, make sure the links between operator’s
networks are trunk links.
z As the VLAN-VPN function is unavailable on ports with 802.1x, GVRP, GMRP, STP,
or NTDP employed, the BPDU Tunnel function is not applicable to these ports.
Example
# Enable the BPDU Tunnel function for the switch.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] vlan-vpn tunnel