Configuring Ggsn Support For L2Tp Tunneling With Ipsec - Cisco ASR 5000 Series 3G Home NodeB Administration Manual

IP Security
Step Description
5. To initiate the IKE SA negotiation, the system performs a Diffie-Hellman exchange of the ISAKMP secret specified in the
profile attribute with the specified peer LNS/security gateway.
6. The system and the LNS/security gateway negotiate an ISAKMP (IKE) policy to use to protect further communications.
7. Once the IKE SA has been negotiated, the system negotiates an IPSec SA with the LNS/security gateway using the
transform method specified in the transform sets.
8. Once the IPSec SA has been negotiated, the system protects the L2TP encapsulated data according to the IPSec SAs
established during step 9 and sends it over the IPSec tunnel.

Configuring GGSN Support for L2TP Tunneling with IPSec

This section provides a list of the steps required to configure the GGSN to encrypt L2TP tunnels using IPSEC. Each
step listed refers to a different section containing the specific instructions for completing the required procedure.
Important:
contexts and L2TP tunneling either as a GGSN. In addition, all parameters configured using this procedure must be
configured in the same destination context on the system as the LAC service.
Step 1
Configure one or more transform sets according to the instructions located in the
of this chapter.
Step 2 Configure one or more ISAKMP policies according to the instructions located in the
section of this chapter.
Step 3
Configure an ipsec-isakmp crypto map according to the instructions located in the
section of this chapter.
Step 4
Configure APN support for encrypting L2TP tunnels using IPSec according to the instructions located in the
Template Configuration to Support L2TP
Step 5 Save your configuration to flash memory, an external memory device, and/or a network location using the Exec mode
command
save configuration
System Administration Guide and the Command Line Interface Reference.
OL-25069-03
These instructions assume that the system was previously configured to support subscriber PDP
section of this chapter.
. For additional information on how to verify and save configuration files, refer to the
Transform Set Configuration
Cisco ASR 5000 Series 3G Home NodeB Gateway Administration Guide ▄
Implementing IPSec for L2TP Applications ▀
ISAKMP Policy Configuration
Dynamic Crypto Map Configuration
APN
section
151