Implementing L2Tp; Sequence Of Events On The Lac - Juniper JUNOSE SOFTWARE 11.0.X - BROADBAND ACCESS CONFIGURATION GUIDE 4-1-2010 Configuration Manual

Table 68: L2TP Terms (continued)

Implementing L2TP

The implementation of L2TP for the E Series router uses four levels:
When the router has established destinations, tunnels, and sessions, you can control
the L2TP traffic. Making a change to a destination affects all tunnels and sessions to
that destination; making a change to a tunnel affects all sessions in that tunnel. For
example, closing a destination closes all tunnels and sessions to that destination.

Sequence of Events on the LAC

The E Series router creates destinations, tunnels, and sessions dynamically, as follows:
Term Description
LNS L2TP network server (LNS) a node that acts as one side of an L2TP tunnel
endpoint and is a peer to the LAC. An LNS is the logical termination point of
a PPP connection that is being tunneled from the remote system by the LAC.
Peer In the L2TP context, refers to either the LAC or LNS. An LAC's peer is an LNS,
and vice versa.
Proxy Authentication data from the PPP client that is sent from the LNS as part of
authentication a proxy LCP. Data might include attributes such as authentication type,
authentication name, and authentication challenge.
Proxy LCP LCP (Link Control Protocol) negotiation that is performed by the LAC on behalf
of the LNS. Proxy sent by the LAC to the LNS containing attributes such as
the last configuration attributes sent and received from the client.
Remote system An end-system or router attached to a remote access network, which is either
the initiator or recipient of a call.
Session A logical connection created between the LAC and the LNS when an end-to-end
PPP connection is established between a remote system and the LNS.
NOTE: There is a one-to-one relationship between established L2TP sessions
and their associated PPP connections.
Tunnel A connection between an LAC-LNS pair consisting of a control connection
and 0 or more L2TP sessions.
System The router
Destination The remote L2TP system
Tunnel A direct path between the LAC and the LNS
Session A PPP connection in a tunnel
Chapter 11: L2TP Overview
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Implementing L2TP