Thank you for your inputs. YOu are right. When I reload the Switch, it again comes with VLAN.dat information. It seems I am loading the Customised Cisco IOS. How can I load the fresh OS from my desktop to 4948 Switch using Console port. I can access Switch# prompt also rommon>. Please provide steps to load Cisco IOS via Console port. I do not have the Ethernet port connected with the computer to perform tftp.
If you are getting the Vlan information again, you must verify you aren't connected to other switches where this information is stored. You must understand, the default setting is VTP server where information from other switches will be copied to this switch.
If you want to have a clear vlan.dat file (you will always have one, btw) - you need to shut down all inter-switch links - perform the erase command as I instructed then reboot.
After a reboot, you will have a new vlan.dat and no vlan information after typing 'show vlan' other than the default vlans.
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