Cisco 6500 - Manual (Page 64)

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Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
Upgrading a VSS
Performing an eFSU Downgrade from a Future Cisco IOS Release to Cisco IOS Release 12.2(33)SXI4
To perform an eFSU downgrade of a VSS from a future Cisco IOS Release to Cisco IOS Release
12.2(33)SXI4, perform this task:
Command Purpose
Step 1 Router# copy tftp disk_name Uses TFTP to copy the new software image to the ICSs and
flash memory on the active and standby chassis (disk0: and
slavedisk0:). Answer the prompts to identify the name and
location of the new software image.
Step 2 Router# show issu state [switch/slot] [detail] (Optional) Verifies that the VSS is ready to run the eFSU.
Note You can use the show issu state command at any
stage of the upgrade to verify the progress and status
of the upgrade.
Step 3 Router# switch virtual in-chassis standby
switch [disable | enable]
(Optional) Includes or removes the ICS from the eFSU
cycle. This command must be executed before the start of
the eFSU cycle even if the ICS is in ROMMON.
Note If you did not remove the ICS from the downgrade
using the switch virtual disable command the
loadversion cycle is aborted, the SSO standby
reloads with the initial image.
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 This command is not extended for the ICS. The file
system mentioned for the ICA is used for the
respective ICS. For example, if the issu
loadversion disk0:image_name
slavesup-bootdisk:image_name command is
executed the loadversion command is accepted. The
presence of the image is checked in the disk0: for
the active supervisor engine (both the ICA and ICS)
and the SPs bootdisk for the SSO standby (both the
ICA and ICS).
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.