Overview of ISG
Information About ISG
2
• Benefits of ISG, page 6
• Planning for ISG Implementation, page 6
What Is ISG?
ISG is a structured framework in which edge access devices can deliver flexible and scalable services to
subscribers. ISG handles the following key aspects of subscriber management:
• Subscriber identification
• Service and policy determination
• Session policy enforcement
• Session life-cycle management
• Accounting for access and service usage
• Session state monitoring
In addition, ISG introduces a dynamic element to the provisioning and activation of services through
control policies and Change of Authorization (CoA) extensions to the RADIUS protocol.
An ISG-enabled device may be deployed at the access edge and service edge of a network and is
applicable to a range of subscriber network environments, such as digital subscriber line (DSL), public
wireless LAN (PWLAN), and mobile wireless. Moreover, ISG has been designed to accommodate a
flexible distribution of subscriber and service information within a given solution. Figure 1 illustrates a
typical DSL deployment for which service profile data may be stored in an authentication, authorization,
and accounting (AAA) database and retrieved and cached on demand.
Figure 1 Sample Topology for a DSL Deployment
It is also possible to define services directly on an ISG. In all cases, service activation may be triggered
as a result of a locally defined control policy, user profile associations, or CoA commands from an
external policy server or portal application.
DSL
DSLAM
ISG
Walled
garden
Internet
browsing
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Internet
Remote
access VPN
AAA
server
Policy
server
Web
portal
DHCP
server
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