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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 6 Configuring the Cisco IOS XE In Service Software Upgrade Process
How to Perform the ISSU Process
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 5 bootflash:new_image 6 slavebootflash:new_image
%issu loadversion executed successfully, Standby is being reloaded
Switch# show issu state detail
Slot = 5
RP State = Active
ISSU State = Load Version
Operating Mode = Stateful Switchover
Current Image = bootflash:old_image
Pre-ISSU (Original) Image = bootflash:old_image
Post-ISSU (Targeted) Image = bootflash:new_image
Slot = 6
RP State = Standby
ISSU State = Load Version
Operating Mode = Stateful Switchover
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 [forced]
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 you use the forced option, the standby supervisor engine
is booted with the new software image. After the software
image is loaded on the standby supervisor engine, if the
software image is incompatible, the system is forced to the
RPR mode. Otherwise the system will continue in the SSO
mode.
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.
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