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Supervisor replacement procedure in VSS environment



This document describes the procedure for Supervisor H/W replacement in a VSS environment.

Core Issue:


In this example it is assumed that a problem has occurred in one of the component devices of VSS, and its Supervisor hardware needs to be replaced.



-Preliminary tasks


Use a healthy device to check the currently active image name and the storage location, and save the image in a compact flash

Acquire the configuration from the healthy device and save it in the compact flash

Check the switch number of the healthy device


-Supervisor replacement procedure


1. Insert the compact flash above in the new Supervisor.

2. Replace the Supervisor and turn the power on.

3. Interrupt the boot sequence while starting SP and put it down to ROMMON.This is to be done when <send break!> is displayed, as shown below.


System Bootstrap, Version 8.5(2)

Copyright (c) 1994-2007 by cisco Systems, Inc.

Cat6k-Sup720/SP processor with 1048576 Kbytes of main memory


Autoboot: failed, BOOT string is empty

Autoboot executing command: "boot "


<send break!>


monitor: command "boot" aborted due to user interrupt

rommon 1 >



4. From ROMMON, boot Supervisor using the image saved in the compact flash.

5. Clear the booted Supervisor's startup-config.


Router#clear startup-config

Erasing the nvramfilesystem will remove all configuration files! Continue? [confirm]


6. If the location of the boot image checked in advance is sup-bootdisk:, copy the image from the compact flash to sup-bootdisk:.

7. If no image is specified by the boot command according to the setting information confirmed in the previous steps, and a different image exists in sup-bootdisk:, delete this image.

8. Copy the settings saved in the compact flash to the startup-config of the new Supervisor.At this point, do not execute "copy run start" or "write".


Router#copy disk0:VSS_configu startup-config

Destination filename [startup-config]?


9. Set the VSS switch number (1 or 2).The number to set is the number not used by any healthy device on the Active side.


Router#switch set switch_num 2

Set rommon'sswitch_num to 2


10. Reboot the device with the new Supervisor.




System configuration has been modified. Save? [yes/no]: no

Proceed with reload? [confirm]


Related Information

Original Document: Cisco Support Community Japan DOC-29582

Author: Yasuhiro Nakajima

Posted on January 25, 2013

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