Operation Manual – MSTPH3C S7500 Series Ethernet Switches Chapter 1 MSTP Configuration1-39To do ... Use the command ... RemarksEnter system view system-view —Enable the rapidtransition functionstp interface interface-typeinterface-numberno-agreement-checkRequiredBy default, the rapid transitionfunction is disabled on a port.2) Configure the rapid transition function in Ethernet port view.Follow these steps to configure the rapid transition function in Ethernet port view:To do ... Use the command ... RemarksEnter system view system-view —Enter Ethernet portviewinterface interface-typeinterface-number —Enable the rapidtransition function stp no-agreement-checkRequiredBy default, the rapid transitionfunction is disabled on a port.Note:z The rapid transition function can be enabled on root ports or alternate ports only.z If you configure the rapid transition function on the designated port, the functiondoes not take effect on the port.1.8 VLAN-VPN Tunnel Configuration1.8.1 IntroductionThe VLAN-VPN tunnel function enables BPDUs to be transparently transmittedbetween geographically dispersed user networks through specified VLAN VPNs in theoperator’s network, through which spanning trees can be generated across these usernetworks and are independent of those of the operator’s network.As shown in Figure 1-6, the upper part is the operator’s network, and the lower part isthe user network. The operator’s network comprises packet ingress/egress devices,and the user’s network has network A and network B. On the operator’s network,configure the arriving BPDU packets at the ingress to have MAC addresses in a specialformat, and reconvert them back to their original formats at the egress. This is howtransparent transmission is implemented over the operator’s network.