â–€ Network Deployment Configurations
â–„ Cisco ASR 5000 Series Product Overview
Figure 101. Mobile IP Protocol Usage.
As depicted above, PPP is used to establish a communications session between the MN and the FA. Once a PPP session
is established, the MN can communicate with the HA, using the FA as a mediator or broker. Data transport between the
FA and HA use tunneled IP, either IP-in-IP or GRE tunneling. Communication between the HA and End Host can be
achieved using the Internet or a private IP network and can use any IP protocol.
The following figure provides a high-level view of the steps required to make a Mobile IP call that is initiated by the
MN to a HA. The following table explains each step in detail. Users should keep in mind that steps in the call flow
related to the Radio Access Node (RAN) functions are intended to show a high-level overview of radio communications
iterations, and as such are outside the scope of packet-based communications presented here.
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