Layer Two Tunneling Protocol : ATM Access Network Extensions
Alcatel
L2TP [RFC2661] specifies a protocol for tunnelling PPP packets over packet based networks and over IP networks in particular. L2TP [RFC2661] supports remote access by ISDN and PSTN networks. This document augments the procedures described in [RFC2661] to further support ATM SVC or PVC based access networks. The extensions defined within this document allow for asymmetric bi-directional call establishment and service selection in the ATM access network.