Layer 2 Virtual Private Networks

Layer 2 Virtual Private Networks (VPNs) are used on GÉANT to support projects that have a need for them, such as DataTag, KarBol and 6NET.

The Layer 2 VPNs currently used on GÉANT are point-to-point connections linking two sites. Typically, these will be two sites that belong to the same organisation or project, but which are each connected to a different network. Using a Layer 2 VPN, the two sites can communicate as though they were directly connected to each other. The Layer 2 VPN will appear as a ‘tunnel’ for the two sites involved.
 
On GÉANT, Layer 2 VPNs are provisioned using Multi-Protocol Label Switching (MPLS) tunnels in the form of Label Switched Paths (LSPs). The LSPs are determined by various relevant constraints and are maintained by Resource Reservation Protocol (RSVP). This ensures the LSPs always follow the optimal path at any given time. If a link in an LSP fails, the LSP will automatically reroute to another path so that it can still be use to forward traffic.

Request a Layer 2 VPN

Use of a Layer 2 VPN on GÉANT must be requested in advance so it can be designed and configured. This is normally done via your NREN by contacting the person responsible for Layer 2 VPNs/MPLS. They will then request a Layer 2 VPN on behalf of your project. Please note that a different solution may be suggested instead of a Layer 2 VPN.

You will need to provide the following information.

• Contact details for the two NRENs involved
• Contact details for the two end sites
• IP addresses of the routers at each end site
• Router model at each end site
• Bandwidth requirements
• A project description
• Applications to be used
• Start and end date for the when the Layer 2 VPN is required.