L2TP Circuit Emulation Services Extension

Document Type Expired Internet-Draft (individual)
Authors Danny McPherson  , Ravi Bhat  , Andy Koscinski  , Chi Ho 
Last updated 2000-06-02
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Layer 2 Tunneling Protocol (L2TP) [RFC2661] defines a mechanism for tunneling PPP sessions. This document proposes mechanisms by which the L2TP tunneling scheme can be used to provide circuit emulation support for layer 2 circuits (i.e. Frame Relay or ATM), as well as TDM circuits (i.e. DS1 or DS3). L2TP is used to provide tunneling support and each circuit is encapsulated over a session inside the Tunnel. An Encapsulation Services Protocol [RefESP] is used on top of the individual L2TP sessions to support the circuit emulation of layer 2 VCs or TDM circuits. The purpose of this document is to explain the L2TP modifications done to facilitate support of circuit emulation services, as well as to define the additional AVPs that can be used to provide the service.


Danny McPherson (danny@arbor.net)
Ravi Bhat (rbhat@ambernetworks.com)
Andy Koscinski (andyk@ambernetworks.com)
Chi Ho (ho@ambernetworks.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)