What is Layer 2 Virtual Private Networks (L2VPN)?

L2VPN service is a technology that allows extension of Layer 2 networks over the service providers core network or IP MPLS(Multiprotocol Label Switching) Network. It enables the creation of point-to-point or point-to-multipoint connections across different geographical locations across the world. geographt164 From customer point of view it will look like they are in the same network separated by a switch.

Key Features of L2VPN Service:

1. Transparency at Layer 2: L2VPN services ensure the transparency of layer 2 protocols throughout the service provider's VPN, L2 protocols like Ethernet, Ethernet VLAN, Frame Relay, ATM, PPP, Fiber Channel, TDM.

2. Service Types :

   • Point-to-Point (Pseudo Wires) : Also refers to a service known as Virtual Private Wire Service (VPWS), which establishes a connection between two customer sites.

   • Multipoint-to-Multipoint: This term is also used for a service called Virtual Private LAN Service (VPLS), which creates a link among various customer locations, treating them as part of a single local Ethernet Network.

3. Use Cases:

   • Enterprise Connectivity: Establishing connections between various branches of a company spanning different cities or countries.

   • Data Center Interconnect (DCI): Connecting data center's located in various places while ensuring a uniform Layer 2 network.

4. Underlying Technology: L2VPN is commonly deployed on an MPLS backbone but can also use IP networks. It encapsulates Ethernet frames in MPLS labels, allowing them to be transmitted across a service provider's network.

5. Security: Since the service runs over a provider's network, it includes mechanisms to ensure customer traffic is isolated and secure from other traffic on the network.

6. Flexibility: L2VPNs support a wide range of protocols and can interconnect various types of Layer 2 networks, making it a flexible solution for enterprises.

In short, L2VPN services allows the extension of a Layer 2 network over a service provider's backbone, allowing Organizations/Customers to seamlessly connect different locations while maintaining the same Layer 2 connectivity and protocols.