Cisco Systems 1000 Series Manual De Usuario

This section covers the following topics:

On the Cisco ASR 1000 Series Routers, IOS runs as one of many processes within the operating system. 
This is different than on traditional Cisco IOS, where all processes are run within Cisco IOS. See the 

 for more information regarding IOS as a process on the Cisco 

ASR 1000 Series Router.

This architecture allows for software redundancy opportunities that are not available on other platforms 
that run Cisco IOS software. Specifically, a standby IOS process can be available on the same Route 
Processor as the active IOS process. This standby IOS process can be switched to in the event of an IOS 
failure, and can also be used to upgrade subpackage software in some scenarios as the standby IOS 
process in an ISSU upgrade.

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 

.

Cisco ASR 1001 
Router

1

1.

If a critical process, such as the ESP or the SIP fails on the Cisco ASR 1001 Router, then the entire chassis reloads.

Yes

N/A

The Cisco ASR 1001 Router only 
supports one RP, so dual IOS processes 
run on the lone RP.

Cisco ASR 1002 
Router

Yes

N/A

The Cisco ASR 1002 Router only 
supports one RP, so dual IOS processes 
run on the lone RP.

Cisco ASR 1004 
Router

Yes

N/A

The Cisco ASR 1004 Router only 
supports one RP, so dual IOS processes 
run on the lone RP.

Cisco ASR 1006 
Router

No

Yes

The Cisco ASR 1006 Router supports a 
second Route Processor, so the second 
IOS process can only run on the 
standby Route Processor.