Cisco ASR 5000 Series, Обзор продукта

Страница: 465 / 992

Packet Data Interworking Function Overview
Features and Functionality - Licensed Enhanced Feature Support ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
able to connect to the network using a simple IP connection, assuming that simple IP fallback is enabled in the PDIF
configuration. See
Simple IP and Simple IP Fallback in this chapter for a full description of this type of network
configuration.
Simple IP
Simple IP is a solution for network providers whose subscribers fall primarily within a limited set of requirements. It
provides the following:
A mobility solution for subscribers who do not typically roam outside their immediate coverage area.
An appropriate level of service for users who do not use the network in such as way as to need constant service
between coverage areas. For example, subscribers who do not perform large file downloads.
A mechanism to complete a call even if the proxy-mip-required or mip-required attributes are not configured in
the subscriber or domain profile.
Proxy Mobile IP
Proxy mobile IP has the following benefits:
Allows an MS that does not support mobile IP to have the same roaming benefits of one that does.
The PDIF communicates with the HA and acts as if the PDIF itself were the handset.
Proxy mobile IP is configured through the configuration, or the corresponding
Diameter AVP or RADIUS Access Accept messages. If neither are present, the PDIF establishes a simple IP
session and the PDIF routes the call to the Internet or corporate network.
Proxy mobile IP provides a mobility solution for subscribers whose mobile nodes do not support mobile IP protocol.
The PDIF sets up the mobile IP tunnel with the HA and the PDIF proxies or acts on behalf of the handset as if it were
the handset. The subscriber receives an IP address from either the service provider or from their home network. As the
subscriber roams through the network as if it were using a full mobile IP connection, the IP address is maintained
providing the subscriber with the opportunity to use IP applications that require seamless mobility such as transferring
files.
Important:
Refer to Proxy Mobile-IP in the System Administration Guide for more information.
Multiple Authentication in a Proxy Mobile IP Network
Multiple authentication requires authenticating both the device and the subscriber.