Cisco 6500 - Manual (Page 63)

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Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
Upgrading a VSS
Step 4 Router# issu loadversion
[active_switch/slot] active-image
[standby_switch/slot] standby-image
Starts the downgrade process by loading the new software
image onto the standby chassis. The image name includes
the path of the target image to be loaded, in the format
devicename:filename.
It may take several seconds for the new image to load and
for the standby chassis to transition to SSO mode.
Note If the active ICS is online when you enter the issu
loadversion command, then an error message is
displayed when the standby supervisor engine is
booting up with the pre-12.2(33)SXI4 image, which
prompts you to disable the active ICS. Once you
disable the active ICS, the cycle will proceed. If you
do not disable the active ICS and enter the issu
runversion command, the command is not
accepted. You will have to either abort the
downgrade process or disable the active ICS to
proceed with the downgrade.
If the standby ICS is online when you enter the issu
loadversion command, the pre-12.2(33)SXI4
image that comes up on the SSO standby forces the
standby ICS to ROMMON.
Step 5 Router# issu runversion Forces a switchover, causing the standby chassis to become
active and begin running the new software. The previously
active chassis becomes standby and boots with the old
image.
Step 6 Router# issu acceptversion (Optional) Halts the rollback timer to ensure that the new
software image is not automatically aborted during the
upgrade process.
Step 7 Router# issu commitversion Loads the new software image onto the standby chassis.
Step 8 Router# show issu state [switch/slot][detail] Verifies the status of the downgrade process. If the
downgrade was successful, both the active and standby
chassis are running the new software version.
Command Purpose