Configuring Redundant Supervisor Engines On The Switch; Synchronization Process Initiation - Cisco WS-C6506 Software Manual

Configuring Redundant Supervisor Engines on the Switch

Configuring Redundant Supervisor Engines on the Switch
These sections describe how to configure the redundant supervisor engines:
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Synchronization Process Initiation

These conditions initiate the synchronization of the run-time and boot images on the active and standby
supervisor engines:
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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
23-4
Synchronization Process Initiation, page 23-4
Redundant Supervisor Engine Configuration Guidelines and Restrictions, page 23-5
Verifying the Standby Supervisor Engine Status, page 23-5
Forcing a Switchover to the Standby Supervisor Engine, page 23-6
High Availability, page 23-8
Configuring Supervisor Engine Redundancy Using NSF with SSO, page 23-15
Time stamp mismatch between the run-time images on the active and standby supervisor
engines—The active supervisor engine synchronizes its run-time image with the standby supervisor
engine if the time stamps of their respective run-time images differ when the system is booted or
reset.
Time stamp mismatch between the boot images on the active and standby supervisor engines—The
active supervisor engine synchronizes its boot image with the standby supervisor engine if the time
stamps of their respective boot images differ when the system is booted or reset, or if you change
the BOOT environment variable.
Current boot image overwritten—If you overwrite the current boot image that is stored on one of the
flash devices, the file system management module detects this event and initiates synchronization.
The active supervisor engine copies its new boot image to the standby supervisor engine.
BOOT environment variables changed—If you change the BOOT environment variables to specify
a different default boot image, the active supervisor engine initiates the boot-image synchronization.
The NVRAM configuration module detects this event and calls the flash synchronization function
with the next probable boot filename by looking at the boot configuration parameter.
Flash PC cards with the same boot-image filename—If you change the flash device on either the
active or standby supervisor engine and the new flash device contains a boot image that has the same
name (but a different time stamp) as the boot image from the previous flash device, the flash file
management module initiates synchronization.
Current run-time image deleted—If you delete the current run-time image from the flash device, the
flash file management module prompts you to verify that you want to delete the current run-time
image. If you confirm the deletion, the flash file management module initiates flash synchronization
and informs the NVRAM configuration module of the change. The NVRAM configuration module
examines the BOOT environment variable to determine the next probable image to boot and calls
the flash synchronization function using the new image name.
Chapter 23 Configuring Redundancy
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