Cisco ASR 5000 series Product Overview page 131

Redundancy and Availability Features
Hardware Action Taken
Failure
Scenario
Unplanned Standby SMC takes
SMC failure control of all system
& management
processes as SPIO
remains active.
SPIO failure Standby SPIO takes
over, using active
SMC.
Software After applying a soft
upgrade busy-out to the
system, performs a
soft boot after the
last session
disconnects.
Important:
However, should the failed card's error condition be corrected (by replacement or configuration change), the state of the
repaired SMC or SPIO does not automatically return to the active state. This migration must occur through manual
intervention by a system administrative user.
With the ability of performing on-line process migration, supporting 1:1 SMC and SPIO redundancy, and utilizing the
fully redundant switching fabric and control bus, single points of failure are eliminated from the switch fabric and
system management capabilities.
The following table shows various maintenance and failure situations involving the processing cards (PSC, PSC2, PPC),
Line Cards (LCs), and RCC cards; and explains how each situation is resolved. Note that LCs are not needed behind the
standby processing cards that provide redundancy.
Table 23.
Hardware Action Taken
Failure Scenario
Processing Card Session managers are
Planned migrated to standby
maintenance processing card. Other
tasks are restarted on
standby card. Network
connection is maintained
on existing LC via RCC.
OL-22938-02
Effect on
Accounting
Data
No impact
No impact
Service
interrupt for the
duration of
system boot
(~4 min)
When an SMC or SPIO failover occurs, the standby SMC or SPIO automatically becomes active.
Service Assurance Features for Processing and Line Cards
Effect on
Accounting Data
No impact
Effect on User Effect on the
Sessions Flow of User
Data Packets
No impact < 2 sec.
interrupt
No impact No impact
Service Service
interrupt for interrupt for
the duration the duration
of system of system
boot (~4 min) boot (~4
min)
Effect on Effect on the flow
User of Data Packets
Sessions
No impact < 2 sec. interrupt
to user traffic on
affected
processing card
(user application
will retransmit
data)
Service Availability Features ▀
Effect on User Effect on
Control Management
Transactions Traffic
< 1 min. < 1 min.
interrupt interrupt
No impact < 1 sec. interrupt
Service interrupt Service interrupt
for the duration for the duration
of system boot of system boot
(~4 min) (~4 min)
Effect on Control
Transactions
< 2 sec. interrupt to new
call setups (PCF/SGSN
and mobile nodes will
retransmit requests)
Cisco ASR 5000 Series Product Overview ▄