• Technologies

  • Instructors

  • Completely Clearing a Cisco Switch…The Easy Way!

    Clearing out a Cisco switch configuration is always a pain because VLANs are kept in a seperate file from the startup-config (NVRAM). There's two ways to clear a switch back to the factory defaults – the easy way and the REALLY easy way:

    The easy way –

    Switch# write erase
    Switch# delete flash:vlan.dat
    Switch# reload

    The REALLY easy way –

    Hold the "mode" button on the front of the switch for 10 seconds. The lights will blink then go solid – the switch completely wipes all configuration and then reboots. Obviously, this method only works on stackable switches as the chassis based switches do not have mode buttons.

    You may also like:  How to Make your Linux Box a DHCP Server

    See what people are saying...

    1. Alessio

      what about formatting from ROM 😉 ….

    2. Interface Technical Training

      Holding the mode button will not delete the vlan.dat file, but you can delete it manually by typing:
      cd flash:
      del vlan.dat

    3. Lars

      will the “mode” button delete vlan.dat as well?

    Share your thoughts...

    Please fill out the comment form below to post a reply.