5-2
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
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Chapter 5 High Availability Overview
Hardware Redundancy Overview on the Cisco ASR 1000 Series Routers
•
SPA interface processors (SIPs)—A SIP must be reloaded, and traffic briefly interrupted, for a SIP
upgrade to complete.
•
Shared port adapters (SPAs)—A SPA must be reloaded, which will briefly interrupt traffic to that
SPA, for a SPA software subpackage update to complete.
Hardware redundancy on the Cisco ASR 1000 Series Routers gives users the following benefits:
•
A failover option—If a processor fails, the standby processor immediately becomes the active
processor with little or no delay. The failover happens completely within the same router, so a
second standby router is not needed.
•
No downtime upgrades—Using features like ISSU, a software upgrade can be handled on the
standby processor while the active processor continues normal operation.
Hardware redundancy is available on the Cisco ASR 1006 Router only at this time.
provides a hardware redundancy overview.
Table 5-1
Hardware Redundancy Overview
Hardware
Support for Dual
Hardware
Configuration on
Cisco ASR 1001
Router
Support for Dual
Hardware
Configuration on
Cisco ASR 1002
Router
Support for
Dual Hardware
Configuration
on Cisco ASR
1004 Router
Support for
Dual Hardware
Configuration
on Cisco ASR
1006 Router
Failover Behavior
Enhanced
Services
Processor
No
No
No
Yes
If an active ESP experiences a
hardware or software event that
makes it unable to forward
traffic (such as a hardware
failure, an OIR, or a manual
switch) and a standby ESP is
configured, the standby ESP
becomes the active ESP with
the possibility of a minor
interruption (less than 200 ms).
Route Processor
No
No
No
Yes
If an active RP experiences an
event that makes it unable to
forward traffic (such as a
hardware failure, a software
failure, an OIR, or a manual
switch) and a standby RP is
configured, the standby RP
immediately becomes the active
RP.