I am in the process of upgrading our 3560-48PS switches from 12.2(40)SE to 12.2(52)SE. To apply the upgrade, I have erased the nvram and saved the new IOS file to the switches. The problem I am running into is losing the vtp data. I am trying to find a way to write the vlan.dat file without adding a new vlan on the vtp server. Is this possible?