Layer 2 Tunneling Protocol (L2TP) is a client-server protocol
that allows Point-to-Point Protocol (PPP) to be encapsulated and tunneled
across a network. An L2TP access concentrator (LAC), configured on
an E Series router, receives packets from a remote client and forwards
them to an L2TP network server (LNS), which can be another E Series
router or another device at the remote edge.
This page provides information that describes the processing
of L2TP traffic on E Series routers.
JunosE Software Documentation for E Series Broadband Services Routers,
Release 13.2