Cisco Cisco ASR 5000
Table 8: AAA/PDSN Assigned IP Address Proxy Mobile IP Call Flow Description
Description
Step
Mobile Node (MN) secures a traffic channel over the airlink with the RAN through the BSC/PCF.
1
The PCF and PDSN/FA establish the R-P interface for the session.
2
The PDSN/FA and MN negotiate Link Control Protocol (LCP).
3
Upon successful LCP negotiation, the MN sends a PPP Authentication Request message to the
PDSN/FA.
PDSN/FA.
4
The PDSN/FA sends an Access Request message to the RADIUS AAA server.
5
The RADIUS AAA server successfully authenticates the subscriber and returns an Access Accept
message to the PDSN/FA. The Accept message may contain various attributes to be assigned to
the MN including the MN's Home Address (IP address) and the IP address of the HA to use.
message to the PDSN/FA. The Accept message may contain various attributes to be assigned to
the MN including the MN's Home Address (IP address) and the IP address of the HA to use.
6
The PDSN/FA sends a PPP Authentication Response message to the MN.
7
The MN sends an Internet Protocol Control Protocol (IPCP) Configuration Request message to the
PDSN/FA with an MN address of 0.0.0.0.
PDSN/FA with an MN address of 0.0.0.0.
8
The PDSN/FA forwards a Proxy Mobile IP Registration Request message to the HA. The message
includes fields such as the MN's home address, the IP address of the FA (the care-of-address), and
the FA-HA extension (security parameter index (SPI)).
includes fields such as the MN's home address, the IP address of the FA (the care-of-address), and
the FA-HA extension (security parameter index (SPI)).
9
While the FA is communicating with the HA, the MN may send additional IPCP Configuration
Request messages.
Request messages.
10
The HA responds with a Proxy Mobile IP Registration Response after validating the home address
against it's pool. The HA also creates a mobile binding record (MBR) for the subscriber session.
against it's pool. The HA also creates a mobile binding record (MBR) for the subscriber session.
11
The MN and the PDSN/FA negotiate IPCP. The result is that the MN is assigned the home address
originally specified by the AAA server.
originally specified by the AAA server.
12
While the MN and PDSN/FA are negotiating IPCP, the HA and AAA server initiate accounting.
13
Upon completion of the IPCP negotiation, the PDSN/FA and AAA server initiate accounting fully
establishing the session allowing the MN to send/receive data to/from the PDN.
establishing the session allowing the MN to send/receive data to/from the PDN.
14
Upon completion of the session, the MN sends an LCP Terminate Request message to the PDSN
to end the PPP session.
to end the PPP session.
15
The PDSN/FA sends a Proxy Mobile IP De-registration Request message to the HA.
16
The PDSN/FA send an LCP Terminate Acknowledge message to the MN ending the PPP session.
17
HSGW Administration Guide, StarOS Release 19
96
Proxy-Mobile IP
Scenario 1: AAA server and PDSN/FA Allocate IP Address