Cisco ASR 5000 Series User Manual

IP Services Gateway Overview
Service Modes ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Service Modes
The IPSG supports the following service modes:
RADIUS Server Mode
RADIUS Snoop Mode
RADIUS Server Mode
When configured in RADIUS server mode, the IPSG inspects identical RADIUS accounting request packets sent to the
RADIUS accounting server and the IPSG simultaneously.
As shown in the following figure, the IPSG inspects the RADIUS accounting request, extracts the required user
information, then sends a RADIUS accounting response message back to the access gateway. The IPSG has three
reference points: sn, si, and sr. The sn interface transmits/receives data packets to/from the access gateway (GGSN, HA,
PDSN, etc.). The si interface transmits/receives data packets to/from the Internet or a packet data network. The sr
interface receives RADIUS accounting requests from the access gateway. The system inspects the accounting request
packets and extracts information to be used to determine the appropriate service(s) to apply to the flow.
Figure 113. IPSG Message/Data Flow (RADIUS Server Mode)
Mobile
Station
RADIUS
Server
Access Gateway
(GGSN/PDSN/HA)
IPSG
Acct Req
s
r
s
n
s
i
IP Data
IP Data
Acct Resp
Acct Resp
Acct Req
Internet

Cisco ASR 5000 Series Specifications

General

Brand	Cisco
Model	ASR 5000 Series
Category	Network Router
Language	English