Service Modes - Cisco ASR 5000 series Product Overview

IP Services Gateway Overview

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
OL-22938-02
RADIUS
Server
Acct Resp
Acct Req
Acct Req
s
r
Acct Resp
s
n
IP Data
Access Gateway
(
GGSN/PDSN/HA)
s
i
IP Data
IPSG
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