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Resetting VLAN database and VTP information   Filed Under: Networks

To be able to clear all the VLAN information saved by the switch and also reset the information configured for VTP in the switch you will need to delete the file vlan.dat that is found in the flash memory of the switch.

After you deleted the file you will need to reload the switch so the changes appear after you do a show vlan and show vtp status.

References

Cisco – Resetting Catalyst switches to defaults