Cisco 6500 - Manual (Page 58)

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Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
Upgrading a VSS
previous software version. To stop the rollback timer, enter the issu acceptversion command. Prior to
starting the eFSU process, you can disable the rollback timer or configure it to a value up to two hours
(the default is 45 minutes).
Operating with an upgraded VSS active chassis, this stage allows you to examine the functionality of the
new software image. When you are satisfied that the new image is acceptable, enter the issu
commitversion command to complete the upgrade process.
Commitversion Stage
To apply the upgrade image to the second chassis, completing the eFSU, enter the issu commitversion
command. The VSS standby chassis is reloaded and booted with the new upgrade image, initializing
again as the VSS standby chassis. As in the loadversion stage, the throughput of the VSS is temporarily
reduced while the modules are reloaded and initialized. After the successful reload and reboot of the VSS
standby chassis, the VSS upgrade process is complete.
Abortversion (Optional)
At any time before you enter the issu commitversion command, you can roll back the upgrade by
entering the issu abortversion command. The upgrade process also aborts automatically if the software
detects a failure. The rollback process depends on the current state. If the eFSU is aborted before you
enter the issu runversion command, the VSS standby chassis is reloaded with the old image. If the eFSU
is aborted after the issu runversion command, a switchover is executed. The VSS standby chassis,
running the old image, becomes the VSS active chassis. The formerly VSS active chassis is then reloaded
with the old image, completing the rollback.
Configuring and Performing an eFSU Upgrade
The following sections describe how to configure and perform an eFSU upgrade:
• Changing the eFSU Rollback Timer, page 4-59
• Performing an eFSU Upgrade, page 4-59
• Performing an eFSU Upgrade from Previous Cisco IOS Releases to Cisco IOS Release
12.2(33)SXI4, page 4-60
• Performing an eFSU Upgrade from Cisco IOS Release 12.2(33)SXI4 to Future Cisco IOS Releases,
page 4-61
• Performing an eFSU Downgrade from Cisco IOS Release 12.2(33)SXI4 to Earlier Cisco IOS
Releases, page 4-62
• Performing an eFSU Downgrade from a Future Cisco IOS Release to Cisco IOS Release
12.2(33)SXI4, page 4-64
• Performing an eFSU Upgrade on an Installed Modular Image, page 4-65
• Aborting an eFSU Upgrade, page 4-66