Cisco ASR 5000 Series - Session Recovery Feature

Redundancy and Availability Features
Service Availability Features ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Table 24. Service Assurance Features for the SPC/SMC Software
Software
Process Failure
Scenario
Action Taken
Effect on
Accounting
Data
Effect on
User
Sessions
Effect on the
Flow of User
Data Packets
Effect on User
Control
Transactions
Effect on
Management
Traffic
SMC -
Management
task failure
Cleanup process
performs automatically,
and process is restarted
No impact
No impact
No impact
No impact
< 1 sec.
interrupt
SMC - System
control task
failure
The same process for
unplanned hardware
failure (table above) is
applied
No impact
No impact
< 2 sec.
interrupt
No impact
< 1 min.
interrupt
The following table shows various software process failure situations involving the processing cards, provides impact
analysis (if any), and explains how each situation is resolved using rapid failure detection techniques found in the
system.
Table 25. Service Assurance Features for the Processing Cards Software
Software
Process Failure
Scenario
Action Taken
Effect on
Accounting Data
Effect on User Sessions
Effect on the
flow of Data
Packets
Effect on
Control
Transactions
Processing
Cards - Session
Manager Task
failure
Cleanup process
performs
automatically, and
process is restarted
AAA Acct._Stop
record is generated
for all sessions in
the affected
subgroup
Affected subgroup sessions
are lost For PSC/PSC2: up to
13200 for PDSN 13200 for
PDIF 13200 for ASN GW,
26400 for HA, and 26400
GGSN)
Lost only
for the
affected
subgroup
Lost only for
the affected
subgroup
Processing
Cards - AAA
failure
Cleanup process
performs
automatically, and
process is restarted
No impact
No impact
No impact
No impact
Processing
Cards - VPN
context failure
Cleanup process
performs
automatically, and
process is restarted
No impact
No impact
< 1 sec.
interrupt for
VPN
context
< 1 sec.
interrupt for
VPN context
1. This Assumes that there is more than 1 active processing card. 2. The information in this row applies to systems on which the
Session Recovery feature is not implemented. With the Session Recovery Feature enabled, no sessions are lost.
Session Recovery Feature
This licensed software feature performs an automatic recovery of all fully established subscriber sessions should a
session manager task failure occur. This functionality is available for the following call types: