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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.0E and IOS 15.2(5)E
Chapter 7 Configuring the Cisco IOS In-Service Software Upgrade Process
Performing the ISSU Process
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 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 11, “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.
Perform the following steps at the active supervisor engine:
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode.
Enter your password if prompted.
Step 2
Switch# issu changeversion [active-slot
active-image-new]] [standby-slot
[standby-image-new]] [at hh:mm | in hh:mm]
[quick]
Initiates a single-step complete upgrade process cycle.
Performs the logic of the four standard commands (issu
loadversion, issu runversion, issu acceptversion, and issu
commitversion) without user intervention.
active-slot—Defines the active slot number.
new-image—Specifies IOS XE image URL to be upgraded
to.
standby-slot—Defines the standby slot number.
standby-image—Specifies the standby IOS XE image URL.
at hh:mm—Schedules an ISSU upgrade to begin in the future.
Provides an exact time (hh:mm, 24 hour format) in the next 24
hours when the upgrade will occur.
in hh:mm—Schedules an ISSU upgrade to begin in the
future. Provides the number of hours and minutes (hh:mm
format) that will elapse before an upgrade will occur (99:59
max).
quick—Upon switchover, boots the standby supervisor
engine with the new, rather than old, image for faster
upgrade.
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