1-44z 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 onthe port.Configuring VLAN-VPN TunnelIntroductionThe VLAN-VPN Tunnel function enables STP packets to be transparently transmitted betweengeographically dispersed user networks through specified VLAN VPNs in operator’s networks, throughwhich spanning trees can be generated across these user networks and are independent of those of theoperator’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 networksA and B. On the operator’s network, configure the arriving STP packets at the ingress to have MACaddresses in a special format, and reconvert them back to their original formats at the egress. This ishow transparent transmission is implemented over the operator’s network.Figure 1-9 VLAN-VPN tunnel network hierarchyConfiguring VLAN-VPN tunnelFollow these steps to configure VLAN-VPN tunnel:To do… Use the command… RemarksEnter system view system-view —Enable MSTP globally stp enable —Enable the VLAN-VPNtunnel function globally vlan-vpn tunnelRequiredThe VLAN-VPN tunnel function is disabledby default.
