Software Redundancy On The Cisco Asr 1000 Series Routers; Second Ios Process On A Cisco Asr 1002 Or 1004 Router; Route Processor Redundancy - Cisco ASR1000-RP1 - ASR 1000 Series Route Processor 1 Router Software Configuration Manual

Software Redundancy on the Cisco ASR 1000 Series Routers

On the Cisco ASR 1006 Router, the second IOS process can run only on the standby Route Processor.
Two IOS processes on the same Router Processor are not possible for any Cisco ASR 1000 Series Router
that supports dual RP hardware redundancy configurations since the second Route Processor can support
a standby IOS process. An overview of software redundancy is shown in
Table 5-2
Router
Cisco ASR 1001
Router
Cisco ASR 1002
Router
Cisco ASR 1004
Router
Cisco ASR 1006
Router
1. If a critical process, such as the ESP or the SIP fails on the Cisco ASR 1001 Router, then the entire chassis reloads.

Second IOS Process on a Cisco ASR 1002 or 1004 Router

For Cisco ASR 1002 and 1004 routers, Route Processor Redundancy and Stateful Switchover can be
used to switch between IOS processes. RPR and SSO need to be configured by the user, however,
because a second IOS process is not available by default on Cisco ASR 1002 and 1004 routers.
Table 5-2
the Cisco ASR 1002 and 1004 routers.
Table 5-3
Router
Cisco ASR 1002 Router
Cisco ASR 1004 Router
ISSU cannot be used to upgrade consolidated packages on Cisco ASR 1002 or 1004 Routers, and only
a few subpackages can be upgraded individually using ISSU through the use of dual IOS processes on
the same Route Processor. See the
information on which subpackages can be upgraded using ISSU in a dual RP setup.
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
5-4
Software Redundancy Overview
Support for Two IOS
Processes on Same
Route Processor
Yes
1
Yes
Yes
No
summarizes the software redundancy opportunities available with the second IOS process for
Software Redundancy Options for Cisco ASR 1002 and 1004 Routers
Support for a
Second IOS
Process on Standby
Route Processor
N/A
N/A
N/A
Yes
Default HA Options with 2 GB or
Setting DRAM
None None
None None
"Route Processor Redundancy" section on page 5-5
Chapter 5 High Availability Overview
Table 5-2.
Explanation
The Cisco ASR 1001 Router only
supports one RP, so dual IOS processes
run on the lone RP.
The Cisco ASR 1002 Router only
supports one RP, so dual IOS processes
run on the lone RP.
The Cisco ASR 1004 Router only
supports one RP, so dual IOS processes
run on the lone RP.
The Cisco ASR 1006 Router supports a
second Route Processor, so the second
IOS process can only run on the
standby Route Processor.
Options with 4 GB or
DRAM
None, RPR, SSO
None, RPR, SSO
for more
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