How to reset the 3750 to factory default

config t
write erase
yes to confirm
then reload the switch
If you have VLAN's on the switch you will also have to delete the vlan.dat file
delete flash:vlan.dat
yes to confirm


Or

Steps to reset switches to default are are available at
http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a00800c4546.shtml

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