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.
Important
Additional ASR 5500 Hardware Requirements
Because session recovery requires numerous hardware resources, such as memory, control processors, NPU
processing capacity, some additional hardware may be required to ensure that enough resources are available
to fully support this feature.
A minimum of four packet processing cards (three active and one standby) per individual chassis is required
to use this feature.
Important
To allow for complete session recovery in the event of a hardware failure during a packet processing card
migration, a minimum of three active packet processing cards and two standby packet processing cards should
be deployed.
To assist you in your network design and capacity planning, consider the following factors:
•
Subscriber capacity is decreased depending on the hardware configuration. A fully configured chassis
would experience a smaller decrease in subscriber capacity versus a minimally configured chassis.
•
The amount by which control transaction processing capacity is reduced.
•
The reduction in subscriber data throughput.
•
The recovery time for a failed software task.
•
The recovery time for a failed packet processing card.
A packet processing card migration may temporarily impact session recovery as hardware resources (memory,
processors, etc.) that may be needed are not available during the migration. To avoid this condition, a minimum
of two standby packet processing cards should be configured.
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).
The session recovery feature, even when the feature use key is present, is disabled by default on the system.Important
ASR 5500 System Administration Guide, StarOS Release 21.4
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Session Recovery
Additional ASR 5500 Hardware Requirements
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