Configuring Redundant Supervisor Engines - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 22 Configuring Redundancy
The supervisor engines can have different runtime and boot images. If the boot image and the runtime
image are the same, and you change the BOOT environment variable or overwrite or destroy the current
boot image on the Flash device that was used to boot the system, the runtime and boot images will differ.
Whenever you reconfigure the boot image, the active supervisor engine synchronizes its current boot
image with the standby supervisor engine.
The boot image is read directly into the Flash file system. You can perform operations (such as copy,
delete, undelete, and so on) on files stored on Flash memory devices, and you can store the boot image
of the active supervisor engine in the standby supervisor engine bootflash. For more information about
using the Flash file system, see
The supervisor engine has a Flash PC card (PCMCIA) slot (slot0) in addition to the onboard Flash
memory; this slot can hold a Flash PC card that can store additional boot images.
Note Throughout this publication, the term Flash PC card is used in place of the term PCMCIA card.
Because you can store multiple boot images, you must specify the name of the boot file image and the
location of the image file in the Flash file system in order to boot and synchronize properly. For
information about how to specify the name and location of the boot image, see
the Switch Boot Configuration."
In the synchronization process, the active supervisor engine checks the standby supervisor engine
runtime image to make sure it matches its own runtime image. The active supervisor engine checks three
conditions:
•
•
•
The following section describes the conditions that can initiate Flash synchronization. For examples of
how the system synchronizes the supervisor engine Flash images with various configurations, see the
"Supervisor Engine Synchronization Examples" section on page

Configuring Redundant Supervisor Engines

These sections describe how to configure redundant supervisor engines:
•
•
•
•
•
•
78-13315-02
If it needs to copy its boot image to the standby supervisor engine
If the standby supervisor engine bootstring needs to be changed
If the standby supervisor engine needs to be reset
Synchronization Process Initiation, page 22-4
Redundant Supervisor Engine Configuration Guidelines and Restrictions, page 22-4
Verifying Standby Supervisor Engine Status, page 22-5
Forcing a Switchover to the Standby Supervisor Engine, page 22-6
High Availability, page 22-8
Supervisor Engine Synchronization Examples, page 22-14
Chapter 24, "Working With the Flash File System."
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Configuring Redundant Supervisor Engines
Chapter 23, "Modifying
22-14.
22-3