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Software Configuration Guide—Release IOS XE 3.6.0SG and IOS 15.2(2)SG
OL-30933-01
Chapter 7 Configuring the Cisco IOS XE In Service Software Upgrade Process
How to Perform the ISSU Process
Image Version = Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3
Switch Software (cat4500e-UNIVERSALK9-M), Version 03.00.00.1.68 CISCO UNIVERSAL
DEVELOPMENT K10 IOSD TEST VERSION
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Sun 29-Aug-10 03:57 by gsbuprod
Configuration register = 0x2920
Switch# show issu state detail
Slot = 6
RP State = Active
ISSU State = Init
Operating Mode = Stateful Switchover
Current Image = bootflash:new_image
Pre-ISSU (Original) Image = N/A
Post-ISSU (Targeted) Image = N/A
Slot = 5
RP State = Standby
ISSU State = Init
Operating Mode = Stateful Switchover
Current Image = bootflash:new_image
Pre-ISSU (Original) Image = N/A
Post-ISSU (Targeted) Image = N/A
The ISSU process has completed. At this stage, any further Cisco IOS XE software version upgrade or
downgrade will require that a new ISSU process be invoked.
Using changeversion to Automate an ISSU Upgrade
This task describes how to use the issu changeversion command to perform a one step ISSU upgrade.
Prerequisites
• Ensure that the new version of Cisco IOS XE 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 active and standby supervisor engines
• 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, you can still upgrade the system using the ISSU CLI commands, but the
system will experience extended packet loss during the upgrade.'
Refer to the Stateful Switchover document for more details on how to configure SSO mode on
supervisor engines (refer to Chapter 10, “Configuring Supervisor Engine Redundancy Using RPR
and SSO on Supervisor Engine 6-E and Supervisor Engine 6L-E”).
• For ISSU to function, the IOS XE software image file names on the active and standby supervisor
engines must match.
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