Information Required - Cisco L2TP Manual

LNS Service Operation

As mentioned previously, LNS functionality on the system is configured via context-level services. LNS

services can be configured in the same context as other services supported on the system or in its own context.

Each context can support multiple LNS services.

One of the most simple configuration that can be implemented on the system to support Simple IP data

applications requires that two contexts (one source and one destination) be configured on the system as shown

in the following figure.

Figure 1: LNS Configuration Example

The source context facilitates the LNS service(s) and the PDN and AAA interfaces. The PDN interface is

bound to the LNS service and connects L2TP tunnels and sessions from one or more peer LACs. The source

context is also be configured to provide AAA functionality for subscriber sessions. The destination context

facilitates the packet data network interface(s) and can optionally be configured with pools of IP addresses

for assignment to subscriber sessions.

In this configuration, the LNS service in the source context terminates L2TP tunnels from peer LACs and

routes the subscriber session data through the destination context to and from a packet data network such as

the Internet or a home network.

Information Required

Prior to configuring the system as shown in figure above, a minimum amount of information is required. The

following sections describe the information required to configure the source and destination contexts.

Source Context Configuration

The following table lists the information that is required to configure the source context.

L2TP Network Server