Adding to a VTP Domain

Adding to a VTP Domain
You need to be careful when adding a new switch into an existing domain. If a switch is inserted
into the domain and has incorrect VLAN information, the result could be a VTP database propagated
throughout the internetwork with false information.
Before inserting a switch, make sure that you follow these three steps:
1. Perform a clear config all to remove any existing VLAN configuration on a set-based switch.
On the IOS-based switches, you must ensure that the new switch has no VTP configuration. If
it has, you should erase the startup-config (after saving it to a TFTP server or as a text file).
2. Power-cycle the switch to clear the VTP NVRAM.
3. Configure the switch to perform the mode of VTP that it will participate in. Cisco’s rule of
thumb is that you create several VTP servers in the domain, with all the other switches set
to client mode.