My customer had a problem yesterday.
In fact, he has 1 Catalyst 4507 and suddenly the Catalyst 4507 lost his vlan configuration (only the vlans configuration).
The catalyst 4507 and the others switches connected are configured as VTP server but with a vtp password.
On the 4507 IOS there is no vlan.dat file on the flash.
So, I don't understand what happened.
Anyone has an idea what could be the reasons ?
Thank you for your help.