Cisco ASR 5000 Series Administration Manual page 4

▀ Contents
Gx Interface Support ......................................................................................................................................... 42
Inter-Chassis Session Recovery ........................................................................................................................ 43
IP Security (IPSec) ............................................................................................................................................ 45
IPv6 Support ...................................................................................................................................................... 46
L2TP LAC Support ........................................................................................................................................... 48
L2TP LNS Support ............................................................................................................................................ 48
Lawful Intercept ................................................................................................................................................ 48
Mobile IP Home and Foreign Agents ................................................................................................................ 49
Mobile IP NAT Traversal .................................................................................................................................. 50
Multimedia Broadcast Multicast Services Support ........................................................................................... 51
Overcharging Protection on Loss of Coverage .................................................................................................. 51
Proxy Mobile IP ................................................................................................................................................ 52
Session Persistence ............................................................................................................................................ 52
Session Recovery Support ................................................................................................................................. 53
Traffic Policing and Rate Limiting .................................................................................................................... 54
Web Element Management System ................................................................................................................... 55
How GGSN Works ................................................................................................................................................ 57
PDP Context Processing .................................................................................................................................... 57
Dynamic IP Address Assignment ...................................................................................................................... 58
Subscriber Session Call Flows .......................................................................................................................... 59
Transparent Session IP Call Flow ................................................................................................................. 60
Non-Transparent IP Session Call Flow ........................................................................................................ 61
Network-Initiated Session Call Flow ............................................................................................................ 64
PPP Direct Access Call Flow ....................................................................................................................... 65
Virtual Dialup Access Call Flow .................................................................................................................. 67
Corporate IP VPN Connectivity Call Flow .................................................................................................. 69
Mobile IP Call Flow ..................................................................................................................................... 71
Proxy Mobile IP Call Flows ......................................................................................................................... 74
IPv6 Stateless Address Autoconfiguration Flows ......................................................................................... 77
Supported Standards............................................................................................................................................... 79
3GPP References ............................................................................................................................................... 79
IETF References ................................................................................................................................................ 80
Object Management Group (OMG) Standards .................................................................................................. 83
Understanding the Service Operation ............................................................ 85
Terminology ........................................................................................................................................................... 86
Contexts ............................................................................................................................................................. 86
Logical Interfaces .............................................................................................................................................. 87
Bindings ............................................................................................................................................................ 88
Services ............................................................................................................................................................. 89
How the System Selects Contexts .......................................................................................................................... 91
Context Selection for Subscriber Sessions ........................................................................................................ 91
GGSN Configuration Example ......................................................................... 93
Information Required ............................................................................................................................................. 95
Source Context Configuration ........................................................................................................................... 95
Destination Context Configuration .................................................................................................................... 98
How This Configuration Works ........................................................................................................................... 103
Transparent IP PDP Context Processing ......................................................................................................... 103
Non-transparent IP PDP Context Processing .................................................................................................. 105
PPP PDP Context Processing .......................................................................................................................... 107
Network-requested PDP Context Processing .................................................................................................. 109
Mobile IP Configuration Examples ................................................................ 111
Example 1: Mobile IP Support Using the System as a GGSN/FA ....................................................................... 112
Information Required ...................................................................................................................................... 113
Source Context Configuration .................................................................................................................... 113
▄ Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide
OL-22944-02