Tag Archive for Routing

Configuring Cisco Banners

Lab Prerequisites:

  • If you are using GNS3 than load the Stub Area Networking GNS3 topology file than start R1.
  • Establish a Console session with Router 1.

Lab Objectives:

  • Configure a login banner so that any attempted connections to the device are prompted with Legal information.
  • Configure an EXEC banner so that when a user establishes an exec session with the device the device displays the hostname and current line the session was established on.
  • Configure a Message of The Day (MOTD) Banner to display current scheduled downtime for device maintenance.

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Recovering IOS on a Catalyst Switch

Lab Prerequisites:

  • This lab will require a REAL switch as this lab cannot be emulated using GNS3.
  • The Cisco IOS on the switch must be corrupt or missing to perform this lab, to emulate this error you can erase the flash memory to practice this lab.
  • An active console session to the device is REQUIRED.
  • You’ll need to use either HyperTerminal or SecureCRT as Putty does not support xModem.

Lab Objectives:

  • Boot the switch into SWITCH ROM mode.
  • Initialize the flash file system.
  • OPTIONAL – Format the flash file system if needed. (This will remove your startup configuration)
  • Set the baud rate to 115200 to increase xmodem transfer speed and decrease time required to restore the IOS Image.
  • Copy the Cisco IOS Image via xModem to Flash:
  • Set the boot parameter to the new image name located in Flash:
  • Unset the baud so that it defaults back to 9600.
  • Boot the switch and verify that the switch boots properly.

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Initial Configuration Dialog

Lab Prerequisites:

  • If You’re using GNS3 than load the Free CCNA Workbook GNS3 topology and start R1 than establish a console session with R1.

Lab Objectives:

  • Familiarize yourself with the Initial Configuration Dialog.

Lab Instruction:

When opening a brand new Cisco box rather it be a Cisco Switch or Router, after booting the device you’ll be prompted by the Initial Configuration Dialog. You’ll also be prompted by this dialog if you do the write erase command in privileged mode and reload the device as it erases the contents of NVRAM. When a Cisco device does not have a startup-config located in NVRAM, the device will prompt you rather or not to start the Initial Configuration Dialog.

Another reason as to why you may see this is that your configuration register is set to 0x2142 which ignores the contents of NVRAM upon boot which is commonly used for password recovery.

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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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