Tunneling Technologies: Layer 2 VPN

This service offered by ISPs allows two remote locations to be logically connected to each other across a layer 2 connection over a carriers network.  This is typically used for customers to manage their own network as L2VPN is the simplest solution where a client wants to manage their own protocols, IP management, QoS, everything.

L2VPN solutions are referred to as pseudowire connections.

Ethernet Pseudowires allow ethernet frames to traverse MPLS clouds.  the service provider extends layer 2 adjacency between sites, allowing spanning tree to run across links. This is referred to as Emulated Sevice.

Ethernet pseudowires has two modes:

  • Raw mode
  • Tagged mode

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