Cisco Cisco Packet Data Gateway (PDG) Guida Alla Risoluzione Dei Problemi
Session Recovery
▀ Additional Hardware Requirements
▄ Cisco ASR 5000 Series Enhanced Feature Configuration Guide
OL-22983-01
Additional Hardware Requirements
Because session recovery requires numerous hardware resources, such as memory, control processors, NPU processing
capacity, etc., some additional hardware may be required to ensure that enough resources are available to fully support
this feature.
capacity, etc., some additional hardware may be required to ensure that enough resources are available to fully support
this feature.
Important:
A minimum of four PACs/PSCs/PSC2s (three active and one standby) per individual chassis is
required to use this feature.
To allow for complete session recovery in the event of a hardware failure during a PAC/PSC migration, a minimum of
three active PACs/PSCs/PSC2s and two standby PACs/PSCs/PSC2s should be deployed.
three active PACs/PSCs/PSC2s and two standby PACs/PSCs/PSC2s should be deployed.
To assist you in your network design and capacity planning, the following list provides information that should be
considered.
considered.
Subscriber capacity is decreased depending on the hardware configuration. A fully configured chassis (12 active
PACs/PSCs/PSC2s and 2 standby PACs/PSCs/PSC2s) would experience a smaller decrease in subscriber
capacity versus a minimally configured chassis (3 active PACs/PSCs/PSC2s and 2 standby PAC/PSCs/PSC2s).
capacity versus a minimally configured chassis (3 active PACs/PSCs/PSC2s and 2 standby PAC/PSCs/PSC2s).
The amount by which control transaction processing capacity is reduced.
The reduction in subscriber data throughput.
The recovery time for a failed software task (e.g., session manager).
The recovery time for a failed PAC/PSC/PSC2 (hardware failure).
If a PAC/PSC/PSC2 migration is being performed, this may temporarily impact the ability to perform session recovery
as hardware resources (e.g., memory, processors, etc.) that may be needed are not available during this operation. To
avoid this condition, a minimum of two standby PACs/PSCs/PSC2s should be configured.
as hardware resources (e.g., memory, processors, etc.) that may be needed are not available during this operation. To
avoid this condition, a minimum of two standby PACs/PSCs/PSC2s should be configured.