Configuring The System To Support Session Recovery; Enabling Session Recovery - Cisco ASR 5500 System Administration Manual

Session Recovery
• Destination-based accounting recovery
• GGSN network initiated connections
• GGSN session using more than 1 service instance
• MIP/L2TP with IPSec integration
• MIP session with multiple concurrent bindings
• Mobile IP sessions with L2TP
• Multiple MIP sessions
Important
When session recovery occurs, the system reconstructs the following subscriber information:
• Data and control state information required to maintain correct call behavior.
• A minimal set of subscriber data statistics; 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.
• The idle time timer is reset to zero and the re-registration timer is reset to its maximum value for HA
Important

Configuring the System to Support Session Recovery

The following procedures allow you to configure the session recovery feature for either an operational system
that is currently in-service (able to accept incoming calls) or a system that is out-of-service (not part of your
production network and, therefore, not processing any live subscriber/customer data).
Important

Enabling Session Recovery

As noted earlier, session recovery can be enabled on a system that is out-of-service (OOS) and does not yet
have any contexts configured, or on an in-service system that is currently capable of processing calls. However,
if the system is in-service, it must be restarted before the session recovery feature takes effect.
Always refer to the Administration Guides for individual products for other possible session recovery and
Interchassis Session Recovery (ICSR) support limitations.
sessions to provide a more conservative approach to session recovery.
Any partially connected calls (for example, a session where HA authentication was pending but has not
yet been acknowledged by the AAA server) are not recovered when a failure occurs.
The session recovery feature, even when the feature use key is present, is disabled by default on the system.
Configuring the System to Support Session Recovery
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