If the switch receives a VTP advertisement over a trunk link, it inherits the management domain name and the VTP configuration revision number. The switch ignores advertisements with a different management domain name or an earlier configuration revision number. If you configure the switch as VTP transparent, you can create and modify VLANs but the changes affect only the individual switch. When you make a change to the VLAN configuration on a VTP server, the change is propagated to all switches in the VTP domain. VTP maps VLANs dynamically across multiple LAN types with unique names and internal index associations.
Mapping eliminates excessive device administration required from network administrators.
VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. VTP server is the default mode. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, in VTP version 2, transparent switches do forward VTP advertisements that they receive out their trunk ports. Each switch in the VTP domain sends periodic advertisements out each trunk port to a reserved multicast address.