Cisco Cisco Tunnel Terminating Gateway (TTG) Guide De Dépannage
L2TP Access Concentrator
Supported LAC Service Configurations for PDSN Simple IP ▀
Cisco ASR 5000 Series Enhanced Feature Configuration Guide ▄
OL-22982-01
6. The encapsulated packets are sent to the peer LNS through the packet data network where they will be un-
encapsulated.
Configuring Attribute-based L2TP Support for PDSN Simple IP
This section provides a list of the steps required to configure attribute-based L2TP support for use with PDSN Simple IP
applications. Each step listed refers to a different section containing the specific instructions for completing the required
procedure.
applications. Each step listed refers to a different section containing the specific instructions for completing the required
procedure.
Important:
These instructions assume that the system was previously configured to support subscriber data
sessions as a PDSN.
Step 1
Configure the subscriber profiles according to the information and instructions located in the Configuring Subscriber
Profiles for L2TP Support section of this chapter.
Profiles for L2TP Support section of this chapter.
Step 2
Configure one or more LAC services according to the information and instructions located in the Configuring LAC
Services section of this chapter.
Services section of this chapter.
Step 3
Configure the PDSN service(s) with the tunnel context location according to the instructions located in the Modifying
PDSN Services for L2TP Support section of this chapter.
PDSN Services for L2TP Support section of this chapter.
Step 4
Save your configuration as described in Verifying and Saving Your Configuration.
PDSN Service-based Compulsory Tunneling
This section describes the working of service-based compulsory tunneling and its configuration.
How PDSN Service-based Compulsory Tunneling Works
PDSN Service-based compulsory tunneling enables wireless operators to send all PPP traffic to remote LNS peers over
an L2TP tunnel for authentication. This means that no PPP authentication is performed by the system.
an L2TP tunnel for authentication. This means that no PPP authentication is performed by the system.
Accounting start and interim accounting records are still sent to the local RADIUS server configured in the system‘s
AAA Service configuration. When the L2TP session setup is complete, the system starts its call counters and signals the
RADIUS server to begin accounting. The subscriber name for accounting records is based on the NAI-constructed name
created for each session.
AAA Service configuration. When the L2TP session setup is complete, the system starts its call counters and signals the
RADIUS server to begin accounting. The subscriber name for accounting records is based on the NAI-constructed name
created for each session.
PDSN service-based compulsory tunneling requires the modification of one or more PDSN services and the
configuration of one or more LAC services.
configuration of one or more LAC services.
The following figure and the text that follows describe how PDSN service-based compulsory tunneling is performed
using the system.
using the system.