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Software Configuration Guide—Release IOS XE 3.6.0SG and IOS 15.2(2)SG
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Chapter 7 Configuring the Cisco IOS XE In Service Software Upgrade Process
How to Perform the ISSU Process
Verifying the ISSU State Before Beginning the ISSU Process
Ensure that the active and standby supervisor engines are up and in ISSU Init state and that both
supervisor engines are running the same current image.
The following example displays the ISSU state before the process begins:
Switch# show issu state detail
Slot = 5
RP State = Active
ISSU State = Init
Operating Mode = Stateful Switchover
Current Image = bootflash:old_image
Pre-ISSU (Original) Image = N/A
Post-ISSU (Targeted) Image = N/A
Slot = 6
RP State = Standby
ISSU State = Init
Operating Mode = Stateful Switchover
Current Image = bootflash:old_image
Pre-ISSU (Original) Image = N/A
Post-ISSU (Targeted) Image = N/A
The new version of the Cisco IOS XE software must be present on both of the supervisor engines. The
directory information displayed for each of the supervisor engines shows that the new version is present.
Switch# dir bootflash:
Directory of bootflash:/
5 -rw- 129923402 Aug 6 2010 09:32:33 +00:00 old_image
6 -rw- 127724184 Aug 6 2010 09:34:07 +00:00 new_image
61341696 bytes total (1111388 bytes free)
Switch# dir slavebootflash:
Directory of slavebootflash:/
4 -rw- 129923402 Aug 6 2006 09:40:10 +00:00 old_image
5 -rw- 127724184 Aug 6 2006 09:42:13 +00:00 new_image
61341696 bytes total (1116224 bytes free)
Loading New Cisco IOS XE Software on the Standby Supervisor Engine
This task describes how to use ISSU to load a new version of Cisco IOS XE software to the standby
supervisor engine.
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.
Note auto-boot must be enabled for ISSU to succeed.
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