Cisco Catalyst 4500 Series - ISSU Using the Four-Command Sequence: Step 1 (Loadversion)

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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
OL-30933-01
Chapter 5 Configuring Virtual Switching Systems
In-Service Software Upgrade (ISSU) on a VSS
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Switch#
ISSU using the Four-command Sequence: Step 1 (loadversion)
This task describes the first step of the ISSU four-command sequence, loadversion, wherein the standby
supervisor engine is loaded with the post-upgrade image.
Please ensure that you have read the Prerequisites to Performing ISSU, page 5-57 section, and
implemented the appropriate steps.
Perform the following steps at the active supervisor engine:
This example shows how to start the ISSU process, boot the standby supervisor engine in the Standby
Hot state, and load the standby supervisor engine slot (6) with the new IOS XE software image:
Switch> enable
Switch# issu loadversion 1 bootflash:new_image 11 slavebootflash:new_image
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode.
Enter your password if prompted.
Step 2
Switch# issu loadversion [active-slot]
active-image-new [standby-slot]
standby-image-new
Starts the ISSU process and (optionally) overrides the
automatic rollback when the new Cisco IOS XE software
version is detected to be incompatible.
It may take several minutes after entering the issu
loadversion command for Cisco IOS XE software to load
onto the standby supervisor engine and for the standby
supervisor engine to transition to SSO mode. This causes
the standby supervisor engine to reload with the new
software image.
If used, the active-slot and standby-slot numbers should be
specified as Virtual Slot numbers. Use the show switch
virtual slot-map command to determine the
correspondence between Virtual slot numbers and their
physical locations.
Step 3
Switch# show issu state [detail]
Displays the state of ISSU during the ISSU process. At this
point in the ISSU process, use this command to check that
the standby supervisor engine is loaded and is in SSO mode.
It may take several minutes after entering the
issu loadversion command for Cisco IOS XE software to
load onto the standby supervisor engine and the standby
supervisor engine to transition to SSO mode. If you enter
the show issu state command too quickly, you may not see
the information you need.
Step 4
Switch# show redundancy [states]
Displays redundancy facility state information.