Berikut tools dan device yang saya pakai :
– Catalyst 2970 Series
– Kabel Console (RG45-USB)
– Laptop (windows 8 64bit)
– App. Putty
Cek di device manager di bagian Ports (COM&LPT) – ATEN USB to Serial Bridge (COM13)
kalau belum ada, install drivernya di sini -> http://www.aten.com/global/en/products/usb-&-thunderbolt/usb-converters/uc232a/#.WWz8_lFLddh
Jika sudah, masuk putty, pilih connection Type Serial. Lalu Serial Linenya ubah sesuai yang muncul di device manager (contohnya COM13). Sisanya biarkan saja, Open.
Lalu Cabut power Catalyst. Putty jangan di close. Tahan tombol Mode di Catalyst sambil colok power Catalyst biar nyala lagi. Tombol mode tetap di tahan dalam beberapa detik.
(gunanya untuk interupt boot Catalystnya)
Setelah beberapa detik, lepas tombol mode, dan akan muncul respond di putty
Using driver version 1 for media type 1
Base ethernet MAC Address: 4c:30:2d:81:ef:80
Xmodem file system is available.
The password-recovery mechanism is enabled.
The system has been interrupted prior to initializing the
flash filesystem. The following commands will initialize
the flash filesystem, and finish loading the operating
system software:
flash_init
boot
switch:
Lalu ketik command :
switch: flash_init
Biarkan respond, lalu hapus file config.text dengan command :
switch: del flash:config.text
Are you sure you want to delete “flash:config.text” (y/n)?y
File “flash:config.text” deleted
Biarkan respond, lalu hapus file vlan.dat dengan command :
switch: del flash:vlan.dat
Are you sure you want to delete “vlan.dat” (y/n)?y
File “flash:vlan.dat” deleted
Setelah itu selesai, reboot Catalyst. Bisa dengan command reload.
Ini adalah hasil pengalaman saya belajar juga. Kalau ada salah atau pertanyaan, silahkan komentar di bawah 

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