• First off, VLANs are sorted through identifiers. Regular VLANs are identified with 1-4096.
• There are actually VLANs 1-1001 which are called normal VLANs and they are stored in the vlan.dat file. These cannot be deleted by deleting the config or running file. They are stored in flash. Every once in a while, you might have to delete them completely though.
• The only way to delete them is by deleting this vlan.dat file and then reloading the switch.
• You can delete these by doing the following steps:
o SW-01>enable
o SW-01#delete vlan.dat
Delete filename [vlan.dat]?
• This displays the vlan.dat filename, press ENTER to confirm.
Delete flash:/vlan.dat? [confirm]
• This asks again that you are about to delete the vlan.dat file from system flash, press ENTER to confirm again.
o SW-01#reload
• Once you reload your switch you can check your VLANs with:
o SW-01#show vlan brief
• Verify the VLANs are fully cleared out.
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