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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 23 Configuring Redundancy
Configuring Redundant Supervisor Engines on the Switch
Redundant Supervisor Engine Configuration Guidelines and Restrictions
These conditions and events can cause the synchronization of the images between the redundant
supervisor engines to fail or to produce unexpected results:
• Downloading a new image to the active supervisor engine
When you download a new image to the active supervisor engine, it is copied to the file system (in
bootflash or on a Flash PC card). Because you may or may not have configured this image as the
boot image, the newly downloaded image is not copied to the standby supervisor engine
automatically.
To initiate the synchronization function between the active and standby supervisor engines, you
must configure this newly downloaded image as the boot image on the active supervisor engine.
Synchronization occurs when you change the boot variable. To run the new image, you must reset
the system.
• Unable to find the current run-time image
If the active supervisor engine is unable to find the current run-time image on any of the flash
devices, it signals an error condition. If you insert or reset the standby supervisor engine, flash
synchronization does not occur. In addition, the STATUS LED on the standby supervisor engine
turns red and the system generates a syslog error message.
• Active supervisor engine in slot 2
When the active supervisor engine is in slot 2, the standby supervisor engine is in slot 1. If you
change the configuration to specify a new boot image and then reset the system, the supervisor
engine in slot 1 becomes the active supervisor engine and loads its default boot image, canceling the
configuration changes that you have just made. To avoid this problem, the switch prompts you for
flash synchronization as soon as you change the boot file configuration.
Verifying the Standby Supervisor Engine Status
You can verify the status of the standby supervisor engine by using the CLI commands described in this
section.
Note The show module command output provides information about the installed daughter cards. The show
test command provides information about the onboard application-specific integrated circuits (ASICs).
To verify the status of the standby supervisor engine, perform one or more of these tasks:
Task Command
Show the status of the standby supervisor engine. show module [mod]
Show the state of the standby supervisor engine
uplink ports.
show port [mod[/port]]
Show diagnostic test results for the standby
supervisor engine.
show test [mod]
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