I have a 3550 that I need to reset all VTP/VLAN Database back to default. Is there a global command that can be used to do this without deleting all configured vlans, and also set vtp domain back to NULL instead of having a domain configured?
after rebooting make sure you have what you need under sh vtp status - check your revision number.
put back the switch and it will learn again the vlans.
hope it helps,
ps: be very, very carefull and check the revision no - if you have a number greater that the current no of your vlan database ... everything will be gone from your network ... this is why make sure you have the switch out of the network
I've noticed on my Cat2924XL (but I think it might be the same on 3550 - they are both IOS-based) there is also necessary to clear the static port-to-VLAN assignments (i.e. switchport access vlan 1 in all interfaces which have been assigned to other VLANs).
If you omit this step and just delete vlan.dat, the switch moves to VTP domain UPGRADE and the VLANs mentioned in the config are present in the new vlan.dat file after the switch reload.
If you want to make the VTP domain status as default, the switch always is in server mode.Change the vtp domain to transparent and then back to Client so that the revision number becomes zero to avoid any Vlan issues in the network.
To clear the Vlans which were learned as VTP client.
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