Proxy-Mobile IP
▀ Overview
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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The MN is assigned an IP address by either the HA, a AAA server, or on a static-basis. The address is stored in a mobile
binding record (MBR) stored on the HA. Therefore, as the MN roams through the service provider’s network, each time
a hand-off occurs, the MN will continue to use the same IP address stored in the MBR on the HA.
Proxy Mobile IP can be performed on a per-subscriber basis based on information contained in their user profile, or for
all subscribers facilitated by a specific APN. In the case of non-transparent IP PDP contexts, attributes returned from the
subscriber’s profile take precedence over the configuration of the APN.
Proxy Mobile IP in WiMAX Service
For subscriber sessions using Proxy Mobile subscriber sessions get established between the MN and the ASN GW as
they would for a Simple IP session. However, the ASN GW/FA performs Mobile IP operations with an HA (identified
by information stored in the subscriber’s profile) on behalf of the MN (i.e. the MN is only responsible for maintaining
the Simple IP subscriber session with ASN GW).
The MN is assigned an IP address by either the ASN GW/FA or the HA. Regardless of its source, the address is stored
in a mobile binding record (MBR) stored on the HA. Therefore, as the MN roams through the service provider’s
network, each time a hand-off occurs, the MN will continue to use the same IP address stored in the MBR on the HA.
Note that unlike Mobile IP-capable MNs that can perform multiple sessions over a single session link, Proxy Mobile IP
allows only a single session over the session link. In addition, simultaneous Mobile and Simple IP sessions will not be
supported for an MN by the FA that is currently facilitating a Proxy Mobile IP session for the MN.
