Types of VTP Advertisements
| Advertisement Type | Function |
| Summary | Sent by server every 300 seconds and after a topology change. Contains a complete dump of all VTP domain information. |
| Subset | Sent by server only after a VLAN configuration change. Contains only information about the specific VLAN change. |
| Advertisement request | Sent by client when additional VTP information is needed. Servers send summary or subset advertisements in response. |
| Pruning request | Sent by clients and servers to announce VLANs that are in active use on local switch ports. These VLANs should not be pruned by neighbors. (These messages are destined for nearest-neighbor switches and are not relayed throughout the domain.) |
