Hi.. done that too. Changing the vtp mode to transparent resets the config revision to 0, but the vlan database remains in the vlan.dat file. Therefore, by deleting that file & do a reload, vlans should be cleared, but it didn't.
The ios version is 12.1(22)EA6. Thanks for the response. Any ideas?
even i have the same version 12.1.22.EA6, after deleting "delete flash:valn.dat" i just restarted the switch & then disconnected the trunking cabling which is connected to the 3550, all vlans got deleted. only if the trunking cable is connected,it gets the updates from the main switch, even though if you delete the flash:vlan.dat. try this option.
I had the same issue and got it working by changing the vtp mode to server, then deleting the vlan.dat file and reloading the switch. Once it came back up I changed the mode back to transparent and all was well. Please keep in mind that I did this with the switch on my desk because changing the vtp mode to server while on the network could have dire consequences if on the network. Cheers!
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
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