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The only configuration that DOES NOT pass VTP packets is a switch configured in VTPv1 Transparent Mode and VTPv3 in off mode. VTPv3 has four modes: server, client, transparent and off.
The difference between transparent and off is the termination of received VTP messages instead of relaying them.
Each VTP device is configured in Transparent, Client or Server mode (except VTP v3 which has an extra mode – ).
The purpose of VTP is copy the contents of the VLAN Database to neighbouring switches so that VLAN configuration in a given operational domain are synchronised – that way, all VLANs are consistently configured, VLAN names are the same and much more.
A Switch in VTP Server mode will always actively participate in sending and receiving VTP and synchronising the VTP data file. A Switch in VTP Client mode will always actively participate in VTP data file synchronisation. A switch in VTP v1 Transparent Mode will not send, receive VTP data or participate in file synchronisation.
A switch in VTP v2 Transparent Mode will send, receive VTP data, but doesn’t participate in VTP file synchronisation.
A switch had to be configured in the role of a VTP server to manage your VLAN configuration on your network.
The sever(s) will share VLAN information with other switches on the network which must use the same domain name.
During the early days of networking, it was difficult to implement VLANs across networks.
Note that VTP was especially useful when first introduced since configuring VLAN over Token Ring and FDDI interfaces was complex, and it took many years for network administrators to understand VLAN configuration.
Importantly, VTP was useful to help stabilise Spanning Tree in the early days by ensuring consistentcy, especially in large networks (well, they were large in 1999 anyway….).
VTP advertisement will not be exchanged if the trunk between the switches is inactive.
In the diagram above, a trunk link is configured between switch S1, - VTP Server, S2 and S3 - VTP client.