Software Upgrade Process
Contents
2
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
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
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Contents
This guide discusses various software upgrade procedures and contains the following sections:
• Prerequisites for Software Upgrade Process, page 2
• ISSU Upgrade for Redundant Platforms, page 2
• Upgrade Process With Service Impact for Nonredundant Platforms, page 76
Prerequisites for Software Upgrade Process
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, 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 2
• ISSU Upgrade Procedures, page 5
• In Service One-Shot Software Upgrade Procedure, page 74
• ISSU Procedures (Prior to Cisco IOS XE Release 2.1.2), page 74
Overview of ISSU on the Cisco ASR 1000 Series Routers
For the Cisco ASR 1000 Series Routers, ISSU-compatibility depends on the software subpackage being
upgraded and the hardware configuration. Consolidated packages are ISSU-compatible in dual RP
configurations only and have other limitations described later in this document. Some RP and ESP
software subpackages can be upgraded in service even in single RP or ESP hardware configurations via
dual IOS processes running on the RP; others require dual RP or ESP configurations for an ISSU
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