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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 5 Configuring the Cisco IOS In-Service Software Upgrade Process
Performing the ISSU Process
ISSU State = Init
Boot Variable = bootflash:old_image,1;
Operating Mode = Stateful Switchover
Primary Version = N/A
Secondary Version = N/A
Current Version = bootflash:old_image
Slot = 2
RP State = Standby
ISSU State = Init
Boot Variable = bootflash:old_image,1;
Operating Mode = Stateful Switchover
Primary Version = N/A
Secondary Version = N/A
Current Version = bootflash:old_image
The new version of the Cisco IOS software must be present on both of the supervisor engines. The
directory information displayed for each of the supervisor engines (or supervisor engines) shows that the
new version is present.
Switch# dir bootflash:
Directory of bootflash:/
5 -rwx 13636500 Sep 6 2006 09:32:33 +00:00 old_image
6 -rwx 13636500 Sep 6 2006 09:34:07 +00:00 new_image
61341696 bytes total (1111388 bytes free)
Switch# dir slavebootflash:
Directory of slavebootflash:/
4 -rwx 13636500 Sep 6 2006 09:40:10 +00:00 old_image
5 -rwx 13636500 Sep 6 2006 09:42:13 +00:00 new_image
61341696 bytes total (1116224 bytes free)
Loading New Cisco IOS Software on the Standby Supervisor Engine
This task describes how to use ISSU to load a new version of Cisco IOS software to the standby
supervisor engine.
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 standby supervisor engine.
Note The switch must boot with the BOOT string setting before the ISSU procedure is attempted.
Note auto-boot must be enabled for ISSU to succeed.
• Optionally, perform additional tests and commands to determine the current state of peers and
interfaces for later comparison.
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