MPLS VPN

MPLS VPN is a family of methods for using multiprotocol label switching (MPLS) to create virtual private networks (VPNs). MPLS VPN is a flexible method to transport and route several types of network traffic using an MPLS backbone.

There are three types of MPLS VPNs deployed in networks today: 1. Point-to-point (Pseudowire) 2. Layer 2 (VPLS) 3. Layer 3 (VPRN)

Point-to-point (pseudowire)

Point-to-point MPLS VPNs employ VLL (virtual leased lines) for providing Layer2 point-to-point connectivity between two sites. Ethernet, TDM, and ATM frames can be encapsulated within these VLLs.

Some examples of how point-to-point VPNs might be used by utilities include:

  • encapsulating TDM T1 circuits attached to Remote Terminal Units
  • forwarding non-routed DNP3 traffic across the backbone network to the SCADA master controller.

Layer 2 VPN (VPLS)
Logical View of a Layer 2 MPLS VPN.

Layer 2 MPLS VPNs, or VPLS (virtual private LAN service), offers a “switch in the cloud” style 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)
Logical View of a Layer 3 MPLS VPN.

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.

gollark: No actual *radio* involved, since my server is connected wiredly.
gollark: It's where you broadcast audio™ via the internet™.
gollark: I actually "run" an "internet radio station" with no listeners whatsoever, by which I mean I sometimes update the playlists it broadcasts into the void.
gollark: I manage all my media stuff with a bunch of nested folders on my server and a thing to expose it on HTTP (with basic auth).
gollark: Some are waaaaay more than that.

See also
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