Cisco Catalyst 4500 Series - Loading New Cisco IOS XE Software on the Standby Supervisor Engine

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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
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Chapter 6 Configuring the Cisco IOS XE In Service Software Upgrade Process
How to Perform the ISSU Process
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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
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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.
• Optionally, perform additional tests and commands to determine the current state of peers and
interfaces for later comparison.
• Ensure the system (both active and standby supervisor engines) is in SSO redundancy mode. If the
system is in RPR mode, you can still upgrade the system using the ISSU CLI commands, but the
system will experience extended packet loss during the upgrade.'
Refer to the Stateful Switchover document for more details on how to configure SSO mode on
supervisor engines.
• For ISSU to function, the IOS XE file names on the active and standby supervisor engines must
match.