Performing An Issu Upgrade - OmniSwitch os6900 Network Configuration Manual

Configuring Virtual Chassis
Virtual Chassis - Upgrading with ISSU
The In-Service Software Upgrade (ISSU) feature is used to upgrade a Virtual Chassis with minimal
network disruption. Each switch can be upgraded individually without requiring the entire Virtual Chassis
to be rebooted at the same time.
The ISSU upgrade overview:
1
The Virtual Chassis will first verify that it is in a state that will allow a successful ISSU upgrade.
2
It will then copy the images and configuration files of the ISSU specified directory to the Slave chassis
and reload the entire Slave chassis from the ISSU directory. The Slave chassis reloads with the new image
files.
3
When the Slave has rebooted and rejoined the Virtual Chassis it is now using the new image files. The
Master chassis is now reset which causes the Slave chassis to become the new Master chassis.
4
When the original Master chassis reloads it comes back as a Slave chassis. To restore the role of
Master to the original Master chassis the current Master can be rebooted and the original Master will take-
over, assuming the Master role.

Performing an ISSU Upgrade

Note. The example below uses a directory named 'issu_dir'. However, the directory can be any user-
defined directory.
1
Ensure that the Virtual Chassis is fully synchronized and certified.
2
Create the flash/issu_dir directory and copy the image files, the issu_version file, the vcsetup.cfg, and
vcboot.cfg files to the /flash/issu_dir directory.
3
Enter 'issu from issu_dir' to begin the ISSU upgrade.
4
The Master copies the /flash/issu_dir directory to the Slave chassis, the Slave is reloaded with the
upgraded code and rejoins the Virtual Chassis.
5
The Master chassis is now reloaded with the upgraded code which causes the Slave chassis to become
the new Master chassis.
As a result of this process both chassis are now running with the upgraded code and the Master and Slave
chassis will have changed roles.
6
Enter 'copy running certified flash-synchro' to certify the configuration.
7
Enter 'reload chassis-id 2' to have the original Master resume its Master role.
OmniSwitch AOS Release 7 Network Configuration Guide June 2013
Virtual Chassis Overview
page 9-13