Session Recovery Support - Cisco ASR 5000 series Product Overview

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Table of Contents

▀ Features and Functionality - Base Software

Registration Revocation is a general mechanism whereby either the P-GW or the HSGW providing Mobile IP

functionality to the same mobile node can notify the other mobility agent of the termination of a binding. Mobile IP

Registration Revocation can be triggered at the HSGW by any of the following:

Session terminated with mobile node for whatever reason

Session renegotiation

Administrative clearing of calls

Session Manager software task outage resulting in the loss of HSGW sessions (sessions that could not be

GW can initiate the revocation for Proxy-MIP calls.

Revocation chapter in the System Enhanced Feature Configuration Guide.

Session Recovery Support

Provides seamless failover and reconstruction of subscriber session information in the event of a hardware or software

fault within the system preventing a fully connected user session from being disconnected.

In the telecommunications industry, over 90 percent of all equipment failures are software-related. With robust

hardware failover and redundancy protection, any card-level hardware failures on the system can quickly be corrected.

However, software failures can occur for numerous reasons, many times without prior indication. StarOS Release 9.0

adds the ability to support stateful intra-chassis session recovery for P-GW sessions.

When session recovery occurs, the system reconstructs the following subscriber information:

Data and control state information required to maintain correct call behavior

Subscriber data statistics that are required to ensure that accounting information is maintained

A best-effort attempt to recover various timer values such as call duration, absolute time, and others

Session recovery is also useful for in-service software patch upgrade activities. If session recovery is enabled during the

software patch upgrade, it helps to preserve existing sessions on the active PSC/PSC2 during the upgrade process.

System Enhanced Feature Configuration Guide.

▄ Cisco ASR 5000 Series Product Overview

Registration Revocation functionality is also supported for Proxy Mobile IP. However, only the P-

For more information on MIP registration revocation support, refer to the Mobile IP Registration

For more information on session recovery support, refer to the Session Recovery chapter in the

PDN Gateway Overview