Loading New Cisco Ios Software On The Standby Supervisor Engine - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 7 Configuring the Cisco IOS In-Service Software Upgrade Process
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Loading New Cisco IOS Software on the Standby Supervisor Engine

This task describes how to use ISSU to load a new version of Cisco IOS software to the standby
supervisor engine.
Prerequisites
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Perform this task at the active supervisor engine:
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Ensure that the new version of Cisco IOS software image is already present in the file system of both
the active and standby supervisor engines. Also ensure that appropriate boot parameters (BOOT
string and config-register) are set for the standby supervisor engine.
The switch must boot with the BOOT string setting before the ISSU procedure is attempted.
auto-boot must be enabled for ISSU to succeed.
Optionally, perform additional tests and commands to determine the current state of peers and
interfaces for later comparison.
Ensure the system (both active and standby supervisor engines) is in SSO redundancy mode. If the
system is in RPR mode rather than SSO mode, you can still upgrade the system using the ISSU CLI
commands, but the system experiences extended packet loss during the upgrade.
Refer to the Stateful Switchover document for more details on how to configure SSO mode on
supervisor engines.
For ISSU to function, the image names on the active and standby supervisor engines must match.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.0E and IOS 15.2(5)E
Performing the ISSU Process
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