Setting up a VLAN

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10. Example Documentation: Configuring a VLAN on a Cisco Switch

This documentation provides step-by-step instructions for configuring a VLAN on a Cisco switch. Follow these steps carefully to ensure proper setup.

Prerequisites:

  • Access to the Cisco switch (either through console or SSH)
  • Administrative credentials for the switch
  • Basic knowledge of Cisco IOS commands

Steps to Configure a VLAN:

  1. Step 1: Access the switch Connect to the switch using either a console cable or SSH. Log in with your administrative credentials.
  2. Step 2: Enter privileged EXEC mode Type the following command and press Enter:
    3. enable

    Enter your privileged EXEC password when prompted.

  3. Step 3: Enter global configuration mode Type the following command and press Enter:
    4. configure terminal
  4. Step 4: Create a new VLAN Use the following command to create a new VLAN (replace X with your desired VLAN number):
    5. vlan X
  5. Step 5: Name the VLAN (optional) To assign a name to the VLAN, use:
    6. name VLAN_NAME

    Replace VLAN_NAME with your desired name.

  6. Step 6: Exit VLAN configuration mode Type:
    7. exit
  7. Step 7: Configure switch ports for the VLAN To assign a port to the VLAN, use:
    8. interface interface_type interface_number
switchport mode access
switchport access vlan X

    Replace interface_type and interface_number with the appropriate values (e.g., FastEthernet0/1).

  8. Step 8: Save the configuration Exit configuration mode and save your changes:
    9. end
copy running-config startup-config
  9. Step 9: Verify VLAN configuration To check your VLAN configuration, use:
    10. show vlan brief

Troubleshooting:

  • If the VLAN doesn't appear in the "show vlan brief" output, ensure you've created it correctly in Step 4.
  • If ports aren't associating with the VLAN, double-check the interface configuration in Step 7.
  • Make sure you've saved the configuration (Step 8) to persist changes after a switch reboot.

By following these steps, you should be able to successfully configure a VLAN on your Cisco switch. Remember to adjust VLAN numbers and interface designations according to your network's specific requirements.