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MPLS VPN is a family of methods for harnessing the power of multiprotocol label switching (MPLS) to create virtual private networks (VPNs). MPLS VPN gives network engineers the flexibility to transport and route several types of network traffic using the technologies of a MPLS backbone.
Point-to-point MPLS VPNs employ VLLs (virtual leased lines) for providing Layer2 point-to-point connectivity between two sites. Ethernet, TDM, and ATM frames can be encapsulated within these VLLs.
Layer 2 VPN (VPLS)
Layer 2 MPLS VPNs, or VPLS (virtual private LAN service), offers a “switch in the cloud” style VPLS service. VPLS provides the ability to span VLANs between sites. L2 VPNs are typically used to route voice, video, and AMI traffic between substation and data center locations.
Layer 3 VPN (VPRN)
Layer 3, or VPRN (virtual private routed network), utilizes layer 3 VRF (VPN/virtual routing and forwarding) to segment routing tables for each “customer” utilizing the service. The customer peers with the service provider router and the two exchange routes, which are placed into a routing table specific to the customer. Multiprotocol BGP (MP-BGP) is required in the cloud to utilize the service, which increases complexity of design and implementation. L3 VPNs are typically not deployed on utility networks due to their complexity; however, a L3 VPN could be used to route traffic between corporate or datacenter locations.