Operation Manual – MSTPH3C S3100-52P Ethernet Switch Chapter 1 MSTP Configuration1-53Note: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 doesnot take effect on the port.1.9 Configuring VLAN-VPN Tunnel1.9.1 IntroductionThe VLAN-VPN Tunnel function enables STP packets to be transparently transmittedbetween geographically dispersed customer networks through specified VLAN VPNs inservice provider networks, through which spanning trees can be generated acrossthese customer networks and are independent of those of the service provider network.As shown in Figure 1-9, the upper part is the service provider network, and the lowerpart comprises the customer networks. The service provider network comprises packetinput/output devices, and the customer network has networks A and B. On the serviceprovider network, configure the arriving STP packets at the input device to have MACaddresses in a special format, and reconvert them back to their original formats at theoutput device. This is how transparent transmission is implemented over the serviceprovider network.NetworkNetwork A Network BCustomer networksService provider networkPacket input/outputdevicePacket input/outputdeviceFigure 1-9 VLAN-VPN tunnel network hierarchy1.9.2 Configuring VLAN-VPN tunnelFollow these steps to configure VLAN-VPN tunnel:
