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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 5 Configuring Virtual Switching Systems
In-Service Software Upgrade (ISSU) on a VSS
This example shows how to reset and reload the current standby supervisor engine (slot 1) with the new
Cisco IOS XE software version. After you enter the commitversion command, the standby supervisor
engine boots in the Standby Hot state.
Switch> enable
Switch# issu commitversion 1 slavebootflash:new_image
%issu commitversion executed successfully
As in prior states, the show redundancy, show redundancy states, show issu state [detailed], and
show switch virtual commands can be used to verify that the VSS has reached the desired state.
At the end of the commitversion state, 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 anew.
Using changeversion to Automate an ISSU Upgrade
This task describes how to use the issu changeversion command to perform a one step ISSU upgrade.
Please ensure that you have read Prerequisites to Performing ISSU, page 5-58, and implemented the
appropriate steps.
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode.
Enter your password if prompted.
Step 2
Switch# issu commitversion [standby-slot]
[standby-image-new]
Allows the new Cisco IOS XE software image to be loaded
into the standby supervisor engine.
Step 3
Switch# show redundancy [states]
Displays redundancy facility state information.
Step 4
Switch# show issu state [detail]
Displays the state of the during the ISSU process. At this
point in the ISSU process, use this command to check that
the standby supervisor engine is loaded with the new image.
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