Cisco L2TP Manuel - Page 9

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L2TP Network Server

Required Information

IP pool addresses

How This Configuration Works

The following figure and the text that follows describe how this LNS service configuration with a single

source and destination context would be used by the system to terminate an L2TP tunnel.

Figure 2: Call Processing Using a Single Source and Destination Context

1. An L2TP tunnel request from a peer LAC is received by the LNS service. The tunnel is to facilitate a

subscriber session.

2. The LAC and LNS establish the L2TP tunnel according to the procedures defined in RFC 2661.

Once the L2TP tunnel is established, subscriber L2TP sessions can be established.

3. The LNS service determines which context to use in providing AAA functionality for the subscriber

session if authentication is enabled for the LNS service. For more information on this process, refer How

the System Selects Contexts in System Administration Guide.

For this example, the result of this process is that LNS service determined that AAA functionality should

be provided by the Source context.

4. The system communicates with the AAA server specified in the Source context's AAA configuration to

authenticate the subscriber.

How This Configuration Works

Description

An initial address and a subnet, or a starting address

and an ending address, are required for each

configured pool. The pool will then consist of every

possible address within the subnet, or all addresses

from the starting address to the ending address.

The pool can be configured as public, private, or static.

L2TP Network Server