Downgrading OS Software

Prior to downgrading software, please make sure the following prerequisites are met.

1. Log in to the via the CLI using the console port.

2. Backup configuration by conducting the following steps.

   1. copy commands.

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      switch (config)# show running-config
              

   2. Copy the output to a text file.

1. Log in to your system via the CLI as admin.

2. Display all installed images on the system.

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    admin@nvos:~$ nv show system image 
               operational          applied
   ----------  -------------------  -------
   current     1                 
   next        1                
   partition1  
     build-id <image2>     
           

3. Uninstall the the image from partition 2 if installed - this is needed only if user it trying to downgrade to an image already installed on the switch.

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   admin@nvos:~$ nv action uninstall system image <image>
           

4. Fetch the desired software image.

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   admin@nvos:~$ nv action fetch system image scp://<username>:<password>@<ip-address>/var/www/html/<new_image>
           

5. Install the fetched image.

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   admin@nvos:~$ nv action install system image files new-nvos-image.bin force
           

6. After reboot, display available images and verify that the new image now appears.

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   admin@nvos:~$ nv show system image 
                operational          applied
   ----------  -------------------   ------- 
   current     1                  
   next        1                   
   partition1  
     build-id <image1>               
   partition2  
     build-id <image2>
           

   Note

   There are two installed images on the system. Therefore, if one of the images gets corrupted (due to power interruption, for example), in the next reboot the image will go up from the second partition.

The system saves a backup configuration file when upgrading from an older software version to a newer one. If the system returns to the older software partition, it uses this backup configuration file.

There are 2 instances where the backup configuration file does not exist:

• The user has run “reset factory” command, which clears all configuration files in the system

• The user has run “system config files” to a configuration file with different name then the backup file

To allow switching partition to the older software version for the 2 aforementioned cases only, follow the steps below.

1. 1. Set the boot partition.

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      switch (config)# image boot next
              

   2. Save the configuration.

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      switch (config)# configuration write
              

   3. Reload the system.

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      switch (config)# reload