Cisco Cisco Packet Data Gateway (PDG) Administrator's Guide
Mobile IP Configuration Examples
Example 2: HA Using a Single Source Context and Multiple Outsourced Destination Contexts ▀
Cisco ASR 5x00 Home Agent Administration Guide ▄
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Figure 9.
Call Processing When Using the system as an HA with a Single Source Context and Multiple Outsourced Destination
Contexts
1. A subscriber session from the FA is received by the HA service over the Pi interface.
2. The HA service determines which context to use to provide AAA functionality for the session. This process is described
in the How the System Selects Contexts section located in the Understanding the System Operation and Configuration
chapter of the System Administration Guide.
chapter of the System Administration Guide.
For this example, the result of this process is that the HA service determined that AAA functionality should be provided
by the Source context.
by the Source context.
3. The system then communicates with the Home AAA server specified in the Source context’s AAA configuration to
authenticate the subscriber.
4. Upon successful authentication, the Source context determines which egress context to use for the subscriber session.
This process is described in the How the System Selects Contexts section located in the Understanding the System
Operation and Configuration chapter of the System Administration Guide.
Operation and Configuration chapter of the System Administration Guide.
For this example, the system determines that the egress context is the Destination context based on the configuration of
the Default subscriber.
the Default subscriber.
5. An IP address is assigned to the subscriber’s mobile node from an IP address pool configured in the destination context.
This IP address is used for the duration of the session and then be returned to the pool.
6. Data traffic for the subscriber session is then routed through the PDN interface in the Destination context.