Cisco Systems 1000 Series Manual De Usuario

Your Cisco IOS software release may not support all of the features documented in this module. To reach 
links to specific feature documentation in this module and to see a list of the releases in which each feature is 
supported, use the 

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 
software image support. To access Cisco Feature Navigator, go to 

. An 

account on Cisco.com is not required.

This guide discusses various software upgrade procedures and contains the following sections:

Be sure to complete the following prerequisites for running the ISSU process based on your chassis 
model:

Refer to the ISSU compatibility tables in the Release Notes for Cisco ASR 1000 Series Aggregation 
Services Routers.

4 GB of DRAM memory is required for installing software upgrade on a system with RP1 route 
processor.

ISSU is supported when the router is running in subpackage mode or in consolidated package mode.

For the Cisco ASR 1001 Router, Cisco ASR 1001-X Router and Cisco ASR 1002-X Router, the 
Cisco IOS Software redundancy requires 8-GB DRAM and the IOS software redundancy license.

ISSU represent a full or partial software upgrade of a system from one version to another with minimal 
outage on the forwarding plane (minimal packet loss) and no outage on the control plane.

This section covers the following topics: