VTP Advertisement Messages, Client advertisement request, Summary advertisement, Subset advertisement

Once the VLAN Trunking Protocol (VTP) is configured on the switches, the switches start advertising VLAN Trunking Protocol (VTP) information between them on their trunk ports. The main information which the switches advertise are management VTP Domain name , configuration revision number and the configured VLANs. VTP advertisements are sent as multicast Ethernet frames and all neighbor devices receive the Ethernet frames.

Three types of VLAN Trunking Protocol (VTP) advertisement messages are

Client advertisement request: A client advertisement request message is a VTP message which a client generates for VLAN information to a server. Servers respond with both summary and subset advertisements.

Summary advertisement: Summary advertisements are sent out every 300 seconds (5 minutes) by default or when a configuration change occurs, which is the summarized VLAN information.

Subset advertisement: Subset advertisements are sent when a configuration change takes place on the server switch. Subset advertisements are VLAN specific and contain details about each VLAN.

Related Tutorials
• What is Virtual Local Area Network (VLAN)
• Advantages of VLAN
• How to create and name static VLAN
• How to view VLAN information using "show vlan" command
• Types of VLAN connection links - Trunk Links and Access Links
• VLAN Frame Tagging
• Inter-Switch Link (ISL) VLAN Tagging
• IEEE 802.1Q VLAN Tagging
• What is Native VLAN
• How to configure VLAN trunk link and native VLAN
• How to configure and assign a switch access port to a VLAN
• What is VLAN Trunking Protocol (VTP)
• What is VLAN Trunking Protocol (VTP) Domain
• VLAN Trunking Protocol (VTP) Modes
• How to configure VLAN Trunking Protocol (VTP)
• How to view VLAN Trunking Protocol (VTP) information
• What is VLAN Trunking Protocol (VTP) Pruning