Vlan-Vpn; Overview - TP-Link T2500G-10MPS User Manual

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Configuring VLAN-VPN

VLAN-VPN

VLAN-VPN (Virtual Private Network) is an easy-to-implement layer 2 VLAN technology, and

it is usually deployed at the edge of the ISP (Internet Service Provider) network.

With VLAN-VPN, when forwarding packets from the customer network to the ISP network,

the switch tags the packets with outer VLAN tags. Thus, packets can be transmitted

through ISP networks with double VLAN tags. In the ISP network, packets are forwarded

according to the outer VLAN tag (VLAN tag of the ISP network), while the inner VLAN tag

is treated as part of the payload. When forwarding packets from the ISP network to the

customer network, the switch remove the outer VLAN tag of the packets. Thus, packets

are forwarded according to the inner VLAN tag (VLAN tag of the customer network) in the

customer network.

The following figure shows the typical application scenario of VLAN-VPN. To realize the

communication between two customer VLANs across the ISP network, you can configure

VLAN-VPN at the ISP edge switches to allow packets from customer VLAN 100 and VLAN

200 to be forwarded through the ISP network with the outer tag of VLAN 1050.

Figure 1-1 Application Scenario of VLAN-VPN

Configuration Guide

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