Cisco ASR 5000 Series, Обзор продукта

Страница: 372 / 992

HA Overview
▀ Network Deployment Configurations
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
Table 56. Mobile IP Call Flow Description
Step Description
1 Mobile Node (MN) secures a traffic channel over the airlink with the RAN through the BSC/PCF.
2 The PCF and PDSN establish the R-P interface for the session.
3 The PDSN and MN negotiate Link Control Protocol (LCP).
4 The PDSN and MN negotiate the Internet Protocol Control Protocol (IPCP).
5 The PDSN/FA sends an Agent Advertisement to the MN.
6 The MN sends a Mobile IP Registration Request to the PDSN/FA.
7 The PDSN/FA sends an Access Request message to the visitor AAA server.
8 The visitor AAA server proxies the request to the appropriate home AAA server.
9 The home AAA server sends an Access Accept message to the visitor AAA server.
10 The visitor AAA server forwards the response to the PDSN/FA.
11 Upon receipt of the response, the PDSN/FA forwards a Mobile IP Registration Request to the appropriate HA.
12 The HA sends an Access Request message to the home AAA server to authenticate the MN/subscriber.
13 The home AAA server returns an Access Accept message to the HA.
14 Upon receiving response from home AAA, the HA sends a reply to the PDSN/FA establishing a forward tunnel. Note that
the reply includes a Home Address (an IP address) for the MN.
15 The PDSN/FA sends an Accounting Start message to the visitor AAA server. The visitor AAA server proxies messages to
the home AAA server as needed.
16 The PDSN return a Mobile IP Registration Reply to the MN establishing the session allowing the MN to send/receive data
to/from the PDN.
17 Upon session completion, the MN sends a Registration Request message to the PDSN/FA with a requested lifetime of 0.
18 The PDSN/FA forwards the request to the HA.
19 The HA sends a Registration Reply to the PDSN/FA accepting the request.
20 The PDSN/FA forwards the response to the MN.
21 The MN and PDSN/FA negotiate the termination of LCP effectively ending the PPP session.
22 The PCF and PDSN/FA close terminate the R-P session.
23 The HA sends an Accounting Stop message to the home AAA server.
24 The PDSN/FA sends an Accounting Stop message to the visitor AAA server.
25 The visitor AAA server proxies the accounting data to the home AAA server.