Virtual leased lines (VLL), also referred to as virtual private wire service (VPWS) or EoMPLS (Ethernet over MPLS), is a way to provide Ethernet-based point to point communication over Multiprotocol Label Switching (MPLS) or Internet Protocol networks.[1] VLL uses the pseudo-wire encapsulation for transporting Ethernet traffic over an MPLS tunnel across an MPLS backbone.[2]

Types

There are 5 types of VLLs:

  • Epipes: Emulates a point-to-point Ethernet service. VLAN-tagged Ethernet frames are supported. Interworking with other Layer 2 technologies is also supported.
  • Apipes: Emulates a point-to-point ATM (Asynchronous Transfer Mode) service. Several subtypes are provided to support different ATM service types.
  • Fpipes: Emulates point-to-point Frame Relay circuit. Some features for interworking with ATM are also supported.
  • Ipipes: Provides IP interworking capabilities between different Layer 2 technologies.
  • Cpipes: Emulates a point-to-point time-division multiplexing (TDM) circuit.

See also

References

  1. ^ Andersson, L.; Rosen, E. (September 2006). Framework for Layer 2 Virtual Private Networks (L2VPNs). Internet Engineering Task Force. doi:10.17487/RFC4664. RFC 4664.
  2. ^ Martini, L.; Rosen, E.; El-Aawar, N.; Heron, G. (April 2006). Encapsulation Methods for Transport of Ethernet over MPLS Networks. Internet Engineering Task Force. doi:10.17487/RFC4448. RFC 4448.


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