Руководство По Устранению Ошибки для Cisco Cisco Packet Data Gateway (PDG)
PDIF Session Recovery
Session Recovery ▀
Cisco ASR 5000 Series Enhanced Feature Configuration Guide ▄
OL-22983-01
Planned PSC Migration
This is the case when a system administrator decides to migrate an ASR 5000 application card (PSC). When the
migration command is issued, all the tasks on affected card are notified to get ready for migration. After task migration
is complete, all the tasks are notified and any post-migration adjustments will be done. At the end of the migration
process, each IPSec Manager is returned to its previous normal operational state before it started migration.
migration command is issued, all the tasks on affected card are notified to get ready for migration. After task migration
is complete, all the tasks are notified and any post-migration adjustments will be done. At the end of the migration
process, each IPSec Manager is returned to its previous normal operational state before it started migration.
Unplanned PSC Migration
This is the case when there is a system fault and a card has failed, or when an individual task fails. When tasks are
restarted as a result of either card failure or task failure, it is recovered with saved information and put back into its
previous state of operation. In either planned or unplanned recovery, only tunnels that are in an already established state
can be recovered. Any non-established tunnels may be lost.
restarted as a result of either card failure or task failure, it is recovered with saved information and put back into its
previous state of operation. In either planned or unplanned recovery, only tunnels that are in an already established state
can be recovered. Any non-established tunnels may be lost.
Hardware Requirements and Configuration
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:
PDIF is designed to run on an ASR 5000 chassis using only SMC controller cards and PSC
application cards.
Important:
A minimum of four PSCs (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 PSC migration, a minimum of three
active and two standby PSCs should be deployed.
active and two standby PSCs 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
PSCs and 2 standby PSCs) would experience a smaller decrease in subscriber capacity versus a minimally
configured chassis (3 active PSCs and 2 standby PSCs).
configured chassis (3 active PSCs and 2 standby PSCs).
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 PSC (hardware failure).
If a PSC 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 PSCs should be configured.
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 PSCs should be configured.