1-49VLAN-VPN Tunnel Configuration ExampleNetwork requirementsz Switch C and Switch D are the access devices for the service provider network.z Switches 4210 operate as the access devices of the customer networks, that is, Switch A andSwitch B in the network diagram.z Switch C and Switch D are connected to each other through the configured trunk ports of theswitches. The VLAN-VPN tunnel function is enabled in system view, thus implementingtransparent transmission between the customer networks and the service provider network.Network diagramFigure 1-11 Network diagram for VLAN-VPN tunnel configurationEth 1/0/1Switch ASwitch DSwitch CSwitch BEth 1/0/1GE 1/0/2GE 1/0/1 GE 1/0/2GE 1/0/1Configuration procedure1) Configure Switch A# Enable MSTP. system-view[Sysname] stp enable# Add Ethernet 1/0/1 to VLAN 10.[Sysname] vlan 10[Sysname-Vlan10] port Ethernet 1/0/12) Configure Switch B# Enable MSTP. system-view[Sysname] stp enable# Add Ethernet 1/0/1 to VLAN 10.[Sysname] vlan 10[Sysname-Vlan10] port Ethernet 1/0/13) Configure Switch C# Enable MSTP. system-view[Sysname] stp enable# Enable the VLAN-VPN tunnel function.