L2TP Access Concentrator
▀ Supported LAC Service Configurations for PDSN Simple IP
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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Figure 39.
PDSN Service-based Compulsory Tunneling Session Processing
1.
A subscriber session from the PCF is received by the PDSN service over the R-P interface.
2.
The PDSN service detects its
tunnel-type
parameter is configured to L2TP and its
tunnel-context
parameter is
configured to the Destination context.
3.
The PDSN forwards all packets for the session to a LAC service configured in the Destination context. If multiple LAC
services are configured, session traffic will be routed to each using a round-robin algorithm.
4.
The LAC service initiates an L2TP tunnel to one of the LNS peers listed as part of its configuration.
5.
Session packets are passed to the LNS over a packet data network for authentication.
6.
The LNS authenticates the session and returns an Access-Accept to the PDSN.
7.
The PDSN service initiates accounting for the session using a constructed NAI.
Session data traffic is passed over the L2TP tunnel established in step 4.
Configuring L2TP Compulsory Tunneling Support for PDSN Simple IP
This section provides a list of the steps required to configure L2TP compulsory tunneling 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.
Important:
These instructions assume that the system was previously configured to support subscriber data
sessions as a PDSN.
