K-Series 'set ssh enabled' command is Lost upon 7.31.04 to 8.02.01 Upgrade

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  • Updated 5 years ago
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Article ID: 15069 

Products
K-Series; firmware 7.31.02.0008, 7.31.03.0010, 7.31.04.0002 

Changes
Enabled SSH access to system management ('set ssh enabled').
Then, upgraded firmware from 7.31.04.0002 (or lower) to 8.02.01.0012, and rebooted onto it. 

Symptoms
The non-default 'set ssh enabled' command is no longer present ('show config ssh'). 

Cause
Design differences in NVRAM format prevent the pre-upgrade SSH state from being read post-upgrade, defaulting it to "disabled". 

Solution/Workaround
Rather than upgrading to 8.02, upgrade to firmware 8.11.03.0005 or higher. 

Workaround:
After the fact, use telnet or serial console to re-add the missing command. 

To prevent such configuration loss, use the CLI in order to boot onto firmware 8.02.01.0012 with the refreshed configuration. 
That is... 

show config outfile slot11/.cfg               [Locally save the non-volatile config]
set boot system K-80201-0012                      [Set up to load the new firmware upon reset]
(Reboot to new code? Type "n" for no)         [  but don't reset yet]
configure slot11/.cfg                                       [Initiate a load of the saved configuration]
(Reboot and reload config? Type "y" for yes) [Confirm it, then load the new firmware]
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Posted 5 years ago

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