Cisco Systems 1000 Series User Manual

Cisco ASR 1000 Series Aggregation Services Routers support the following software upgrade 
procedures:

In-Service Software Upgrades (ISSU) for redundant platforms—The ISSU process allows software 
to be updated or otherwise modified while packet forwarding continues with minimal interruption. 
ISSU supports two different software upgrade modes:

Consolidated package mode

Subpackage mode

The supported platforms include Cisco ASR 1006 and Cisco ASR 1013 Routers.

Upgrade process with service impact for non redundant platforms—Non-hardware-redundant 
chassis models (such as the Cisco ASR 1001 Router, Cisco ASR 1001-X Router, Cisco ASR 1002 
Router, Cisco ASR 1002-X Router, and Cisco ASR 1004 Router) do not support ISSU upgrade or 
downgrade. Instead subpackage software upgrade is supported only if the router is running in 
subpackage mode.Traffic loss cannot be avoided during the installation of the ESP package as a part 
of ISSU.

 lists Compatibility matrix of the software upgrade process for various Cisco ASR 1000 Series 

Aggregation Services Router.

Cisco ASR 1006 Router

Supported

Supported

CiscoASR 1013 Router

Supported

Supported

CiscoASR 1004 Router

Not Supported

Supported

CiscoASR 1002 Router

Not Supported 

Supported

Cisco ASR 1002-X Router Not Supported

Supported

CiscoASR 1002-F Router

Not Supported

Supported

CiscoASR 1001 Router

Not Supported

Supported

CiscoASR 1001-X Router Not Supported

Supported