Basic Operation Guide 2014/02

Rolling back switch software
If you have followed the update procedures documented in the previous section, you should be
able to revert to your previous configuration and software version using the steps below.
CAUTION: Long usernames and passwords. Software versions K.15.01.0032 and later support
the longer usernames and passwords introduced in K.14.59.
Before downgrading to a software version that does not support long user-names and passwords,
use one of the following procedures:
• Using the password CLI command or the Web browser interface, change usernames or
passwords to be no more than 16 characters in length, and without any special characters.
Then execute a CLI write memory command (required if the include-credentials feature has
ever been enabled).
• Clear the values using the no password all CLI command. Then execute a CLI write memory
command (required if the include-credentials feature has ever been enabled).
• Clear password values by using the "Clear" button on the switch. Then execute a CLI write
memory command (required if the include-credentials feature has ever been enabled).
Note: The procedures above should be used only when downgrading from a software version that
supports long usernames and passwords to a version that does not.
To roll back your switch from K.15.01.0031 to K.14.47, for example, follow the steps below:
1. Verify that your images and configuration are set correctly using the show version, show flash
and show config files commands.
Switch1# show version
Image stamp: /sw/code/build/btm(t5a)
Apr 23 2010 05:43:42
K.15.01.0031
67
Boot Image: Primary
Switch1# show flash
Image Size(Bytes) Date Version
------ ----------- ------- -------
Primary Image : 11537788 04/23/10 K.15.01.0031
Secondary Image : 9839140 11/06/09 K.14.47
Boot Rom Version: K.15.09
Default Boot : Primary
Switch1# show config files
Configuration files:
id | act pri sec | name
---+-------------+-----------------------------
1 | * * | config1
2 | * | config2
3 | |
2. Boot the switch using the secondary image (with config2).
Switch1# boot system flash secondary
System will be rebooted from secondary image. Do
you want to continue [y/n]? y
Enter ‘y’ for yes, and the switch will boot from the secondary image (K.14.47, in this example)
with the corresponding configuration for that software version (Config2).
Downloading switch documentation and software from the web 133