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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]], [[Time-division multiplexing|TDM]], and [[Asynchronous Transfer Mode|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 circuit]]s attached to [[Remote Terminal Unit]]s
* forwarding non-routed [[DNP3]] traffic across the backbone network to the [[SCADA]] master controller.
== Layer 2 VPN (VPLS) ==
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== External links ==
*
[[Category:MPLS networking]]
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