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Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-17
Chapter 5 Software Upgrade Processes Supported by Cisco ASR 1000 Series Routers
Contents
Finding Feature Information in This Module
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 “Feature Information for Software Upgrade Process” section on page 5-251.
Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images
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 http://www.cisco.com/go/cfn. An
account on Cisco.com is not required.
Contents
This guide discusses various software upgrade procedures and contains the following sections:
• Prerequisites for Software Upgrade Processes, page 5-2
• ISSU Upgrade for Redundant Platforms, page 5-2
• Upgrade Process with Service Impact for Nonredundant Platforms, page 5-74
• Minimal Disruptive Restart ISSU, page 5-152
Prerequisites for Software Upgrade Processes
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 Upgrade for Redundant Platforms
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:
• Overview of ISSU on the Cisco ASR 1000 Series Routers, page 5-3
• ISSU Upgrade Procedures, page 5-6
• In Service One-Shot Software Upgrade Procedure, page 5-71
• ISSU Procedures (Prior to Cisco IOS XE Release 2.1.2), page 5-72