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Configuring ISG Policies for
Session Maintenance
First Published: March 20, 2006
Last Updated: November 5, 2009
Intelligent Services Gateway (ISG) is a Cisco IOS and Cisco IOS XE software feature set that provides
a structured framework in which edge devices can deliver flexible and scalable services to subscribers.
ISG provides two commands, timeout absolute and timeout idle, that each allow control over a session
and a traffic class configured on the session as defined by a service policy map. Additionally, the Internet
Engineering Task Force (IETF) RADIUS attributes Session-Timeout (attribute 27) and Idle-Timeout
(attribute 28) can be used in non-traffic-class-based service profiles on an authentication, authorization,
and accounting (AAA) server to configure the same session maintenance control.
IP subscriber session keepalive support is configured for monitoring session data traffic in the upstream
direction for idleness. Address Resolution Protocol (ARP) is used for Layer 2 connected subscribers. For
routed host (Layer 3 connected) subscribers, the protocol defaults to Internet Control Message Protocol
(ICMP). ICMP is also used in configurations where the access interface does not support ARP.
Finding Feature Information
For the latest feature information and caveats, see the release notes for your platform and software
release. To find information about the features documented in this module, and to see a list of the releases in
which each feature is supported, see the “Feature Information for Configuring ISG Policies for Session
Maintenance” section on page 18.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software
image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on
Cisco.com is not required.
Contents
• Prerequisites for Configuring Policies for Session Maintenance, page 2
• Restrictions for Configuring Policies for Session Maintenance, page 2
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