All Cisco switches are configured to be VTP servers by default. To configure VTP, first you have to configure the domain name you want to use. And of course, once you configure the VTP information on a switch, you need to verify it.
When you create the VTP domain, you have a few options, including setting the domain name, password, operating mode, and pruning capabilities of the switch. Use the vtp global configuration mode command to set all this information. In the following example, I’ll set the S1 switch to vtp server, the VTP domain to Lammle, and the VTP password to todd, using the layout we used in Figure 10-14:
S1#(config)#vtp mode server
Device mode already VTP SERVER.
S1(config)#vtp domain Lammle