Reference Guide

Recovering from a Forgotten Password on the S4820T System
If you configure authentication for the console and you exit out of EXEC mode or your console session times out, you are
prompted for a password to re-enter.
Use the following commands if you forget your password.
1. Log onto the system using the console.
2. Power-cycle the chassis by switching off all of the power modules and then switching them back on.
3. Hit any key to abort the boot process. You enter uBoot immediately, as indicated by the => prompt.
(during bootup)
hit any key
NOTE: You must enter the CLI commands. The system rejects them if they are copied and pasted.
4. Set the system parameters to ignore the startup configuration file when the system reloads.
uBoot mode
setenv stconfigignore true
5. To save the changes, use the saveenv command.
uBoot mode
saveenv
6. Reload the system.
uBoot mode
reset
7. Copy startup-config.bak to the running config.
EXEC Privilege mode
copy flash://startup-config.bak running-config
8. Remove all authentication statements you might have for the console.
LINE mode
no authentication login no password
9. Save the running-config.
EXEC Privilege mode
copy running-config startup-config
10. Set the system parameters to use the startup configuration file when the system reloads.
uBoot mode
setenv stconfigignore false
11. Save the running-config.
EXEC Privilege mode
copy running-config startup-config
Recovering from a Forgotten Enable Password on the S4820T
Use the following commands if you forget the enable password.
1. Log onto the system using the console.
2. Power-cycle the chassis by switching off all of the power modules and then switching them back on.
3. Hit any key to abort the boot process. You enter uBoot immediately, as indicated by the => prompt.
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