Cisco 6500 User Manual

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Cisco IOS Software Configuration Guide, Release 12.2SX

OL-13013-06

Chapter 4 Configuring Virtual Switching Systems

Upgrading a VSS

If the ICS is participating in the eFSU upgrade, you must ensure that the ICS is up and running before
performing each ISSU step. If the ICS is not up and running, you need to wait until it is online. You can
verify that the ICS is online by entering the show module command.

Performing an eFSU Downgrade from Cisco IOS Release 12.2(33)SXI4 to Earlier Cisco IOS Releases

To perform an eFSU downgrade of a VSS from Cisco IOS Release 12.2(33)SXI4 to an earlier Cisco IOS
release, perform this task:

Step 5

Router# issu runversion

Forces a switchover, causing the standby engine chassis to
become active and begin running the new software. The
previously active chassis becomes standby and boots with
the old image.

Note

If there are two supervisor engines in the active
chassis, an in-chassis role reversal will occur if the
upgrade cycle starts with both supervisor engines in
the active chassis unless you have configured a
supervisor engine to not participate in the upgrade.

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 upgrade process. If the upgrade
was successful, both the active and standby chassis are
running the new software version. The ICS is forced to
ROMMON.

Command Purpose

Step 1

Router# copy tftp disk_name

Uses TFTP to copy the new software image to 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.