Tag Archive for Password

Catalyst Switch Password Reset

Lab Prerequisites:

  • You’ll need an active Console session with the switch you’re unable to access.
  • You’ll need to be physically located near the switch to perform this procedure.

Lab Objectives:

  • Boot the switch into SWITCH ROM by holding the MODE button down and plugging in the power to the switch.
  • Rename the configuration file in flash to a different name such as; config.old
  • Boot the switch and copy the contents of flash:config.old into the running configuration after you’ve obtained privilege level access.
  • Copy the updated configuration to NVRAM by syncing the running config with the start-up config.

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Cisco 2600 Series Password Reset

Lab Prerequisites:

  • A Cisco 2600 Series router or greater that has an unknown console or enable password.
  • An active Serial Console session to the device that you’re unable to log into.

 

Lab Objectives:

  • Break the boot sequence when powering on the Cisco 2600 Series router to place yourself in ROM monitor mode.
  • Change the configuration register to 0x2142 to make the router bypass the contents of NVRAM when booting then reset the router.
  • (Option 1) – Once booted, place yourself into privileged mode and copy the start up-config to the running config. Afterward, you may change the line password or enable password and write the configuration by to NVRAM by issuing the copy run start command.
  • (Option 2) – Once booted, place yourself into privileged mode and do a write erase to clear the contents of the NVRAM.
  • Now change the configuration register back to 0x2102 to boot set the router to boot normally and load the NVRAM contents upon boot.
  • Now change the configuration register back to 0x2102 to boot set the router to boot normally and load the NVRAM contents upon boot.

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Cisco 2500 Series Password Reset

Lab Prerequisites:

  • A Cisco 2500 Series router that has an unknown console or enable password.
  • An active Serial Console session to the device that you’re unable to login to.

 

Lab Objectives:

  • Break the boot sequence when powering on the Cisco 2500 Series router to place yourself in rom monitor mode.
  • Change the configuration register to 0x2142 to make the router bypass the contents of NVRAM when booting then initialize the router (boot the router into IOS).
  • (Option 1) – Once booted, place yourself into privileged mode and copy the start up-config to the running config. Afterward, you may change the line password or enable password and write the configuration by to NVRAM by issuing the copy run start command.
  • (Option 2) – Once booted, place yourself into privileged mode and do a write erase to clear the contents of the NVRAM.
  • Now change the configuration register back to 0x2102 to boot set the router to boot normally and load the NVRAM contents upon boot.

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