Cisco ASR 5000 Series Administration Manual page 158

▀ Using the System as Both a GGSN/FA and an HA
5. The FA component of the GGSN sends a Agent Advertisement message to the MS. The message contains the
FA parameters needed by the mobile such as one or more card-of addresses. The message is sent as an IP
limited broadcast message (i.e. destination address 255.255.255.255), however only on the requesting MS‟s
TEID to avoid broadcast over the radio interface.
6. The MS sends a Mobile IP Registration request to the GGSN/FA. This message includes either the MS‟s static
home address or it can request a temporary address by sending 0.0.0.0 as its home address. Additionally, the
request must always include the Network Access Identifier (NAI) in a Mobile-Node-NAI Extension.
7. The FA forwards the registration request from the MS to the HA while the MS‟s home address or NAI and TEID
are stored by the GGSN. The FA service communicates with the required HA service configured in the same
context over the ICC interface. In response the HA sends a registration response to the FA containing the
address assigned to the MS.
8. The FA extracts the home address assigned to the MS by the HA from the response and the GGSN updates the
associated PDP context. The FA then forwards it to the MS (identified by either the home address or the NAI
and TEID).
9. The GGSN issues a PDP context modification procedure to the SGSN in order to update the PDP address for the
MS.
10. The MS sends/receives data to/from the packet data network over the GGSN‟s PDN interface.
11. Upon termination of the subscriber session, the GGSN sends GGSN charging detail records to the CGF using
GTPP over the Ga interface.
▄ Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide
GGSN and Mobile IP Service in a Single System Configuration Example
OL-22944-02