Example 1: Mobile Ip Support Using The System As A Ggsn/Fa - Cisco ASR 5000 Series Administration Manual

▀ Example 1: Mobile IP Support Using the System as a GGSN/FA

Example 1: Mobile IP Support Using the System as a GGSN/FA
For Mobile IP applications, the system can be configured to perform the function of a Gateway GPRS Support
Node/Foreign Agent (GGSN/FA) and/or a Home Agent (HA). This example describes what is needed for and how the
system performs the role of the GGSN/FA. Examples 2 and 3 provide information on using the system to provide HA
functionality.
The system‟s GGSN/FA configuration for Mobile IP applications is best addressed with three contexts (one source, one
AAA, and one Mobile IP destination) configured as shown in the figure that follows.
Important:
disabled in the FA service configuration. Reverse Tunneling is enabled by default.
The source context will facilitate the GGSN service(s), and the Ga and Gn interfaces. The AAA context will be
configured to provide foreign AAA functionality for subscriber PDP contexts and facilitate the AAA interfaces. The
MIP destination context will facilitate the FA service(s) and the Gi interface(s) from the GGSN/FA to the HA.
The optional destination context will allow the routing of data from the mobile node to the packet data network by
facilitating a packet data network (PDN) interface. This context will be used only if reverse tunneling is disabled.
▄ Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide
A fourth context that serves as a destination context must also be configured if Reverse Tunneling is
Mobile IP Configuration Examples
OL-22944-02