1-44
z The rapid transition feature can be enabled on only root ports or alternate ports.
z If you configure the rapid transition feature on a designated port, the feature does not take effect on
the port.
Introduction
The VLAN-VPN Tunnel function enables STP packets 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.
As shown in Figure 1-9, the upper part is the operator’s network, and the lower part is the user’s network.
The operator’s network comprises packet ingress/egress devices, and the user’s network has networks
A and B. On the operator’s network, configure the arriving STP packets at the ingress to have MAC
addresses in a special format, and reconvert them back to their original formats at the egress. This is
how transparent transmission is implemented over the operator’s network.
Figure 1-9 VLAN-VPN tunnel network hierarchy
Configuring VLAN-VPN tunnel
Follow these steps to configure VLAN-VPN tunnel:
To do… Use the command… Remarks
Enter system view system-view —
Enable MSTP globally stp enable —
Enable the VLAN-VPN
tunnel function globally vlan-vpn tunnel
Required
The VLAN-VPN tunnel function is disabled
by default.