http://www.cordero.me/blog/resetting-catalyst-switches-to-factory-defaults
Reset Switch Configuration
Reset Switch Configuration
1. Type in “write erase” to erase the NVRAM filesystem:
Switch#wr erase Erasing the nvram filesystem will remove all configuration files! Continue? [confirm] [OK] Erase of nvram: complete Switch#
2. When that’s finished, type in “reload” and do NOT save the config:
Switch#reload *Mar 2 05:51:10.245: %SYS-7-NV_BLOCK_INIT: Initialized the geometry of nvrameload Proceed with reload? [confirm] *Mar 2 05:51:14.062: %SYS-5-RELOAD: Reload requested by console. Reload reason: Reload command Using driver version 1 for media type 1 Base ethernet MAC Address: 18:ef:63:70:d6:00 Xmodem file system is available. The password-recovery mechanism is enabled. Initializing Flash... mifs[2]: 0 files, 1 directories mifs[2]: Total bytes : 3870720 mifs[2]: Bytes used : 1024 mifs[2]: Bytes available : 3869696 mifs[2]: mifs fsck took 0 seconds. mifs[3]: 416 files, 8 directories mifs[3]: Total bytes : 27998208 mifs[3]: Bytes used : 13362176 mifs[3]: Bytes available : 14636032 mifs[3]: mifs fsck took 6 seconds. ...done Initializing Flash. done. Loading "flash:/c3750-ipbasek9-mz.122-50.SE1/c3750-ipbasek9-mz.122-50.SE1.bin"...@@@@@@@@@
Reset VLAN Information
1. Type in “show vlan” to see if there are any VLANs configured:
Switch#sh vlan br VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa1/0/1, Fa1/0/2, Fa1/0/3 Fa1/0/4, Fa1/0/5, Fa1/0/6 Fa1/0/7, Fa1/0/8, Fa1/0/9 Fa1/0/10, Fa1/0/11, Fa1/0/12 Fa1/0/13, Fa1/0/14, Fa1/0/15 Fa1/0/16, Fa1/0/17, Fa1/0/18 Fa1/0/19, Fa1/0/20, Fa1/0/21 Fa1/0/22, Fa1/0/23, Fa1/0/24 Gi1/0/1, Gi1/0/2 10 HR active 50 PRINTERS active 99 VOIP active 100 IT active 999 Remote-Span active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup Switch#
2. Next type in “dir flash:” to verify the vlan.dat file
Switch#dir flash: Directory of flash:/ 2 -rwx 756 Mar 1 1993 04:47:02 +00:00 vlan.dat !--- This vlan.dat file stores user-configured VLANs. 3 drwx 512 Mar 1 1993 00:12:38 +00:00 c3750-ipbasek9-mz.122-50.SE1 27998208 bytes total (14636032 bytes free) Switch#
3. Delete the “vlan.dat” file
Switch#delete flash:vlan.dat Delete filename [vlan.dat]? Delete flash:vlan.dat? [confirm] Switch#
4. Reload once again
Switch#reload Proceed with reload? [confirm] *Mar 1 00:24:17.621: %SYS-5-RELOAD: Reload requested by console. Reload reason: Reload command
5. Now just confirm that the VLANs are gone and we are back to a factory default setting
Switch#sh vlan *Mar 1 00:02:02.272: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively downbr VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa1/0/1, Fa1/0/2, Fa1/0/3 Fa1/0/4, Fa1/0/5, Fa1/0/6 Fa1/0/7, Fa1/0/8, Fa1/0/9 Fa1/0/10, Fa1/0/11, Fa1/0/12 Fa1/0/13, Fa1/0/14, Fa1/0/15 Fa1/0/16, Fa1/0/17, Fa1/0/18 Fa1/0/19, Fa1/0/20, Fa1/0/21 Fa1/0/22, Fa1/0/23, Fa1/0/24 Gi1/0/1, Gi1/0/2 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup Switch#
If you can not get into the switch, reset it pressing the MODE button:
Follow these steps to return your switch to the factory default settings:
1.
Press and hold the Mode button.
Press and hold the Mode button.
The switch LEDs begin blinking after about 2 seconds. If the switch is not configured, the LEDs above the mode button turn green. You can omit this step and run Express Setup to configure the switch.
