VTP can update each switch in the same domain by sending and receiving VTP advertisements. There are 3 types of VTP advertisement which are Summary Advertisement, Subset Advertisement and Client Advertisement.
Summary Advertisements are advertisements that are sent every 5 minutes from either a client or a server switch to its neighbors. It is also sent immediately when a configuration change has been made. Summary Advertisement contains the latest configuration from the switch. It contains several items which include:
- VTP domain name and revision
- Configuration revision number
- MD5 hash code
- Timestamp
- Number of subset advertisements that will follow
Subset advertisements are being sent by the VTP server when there is a change in the VLAN configuration or in response to an advertisement request. This will be sent when:
- A VLAN was created, deleted, activated, or suspended
- A VLAN has been renamed
- A new MTU unit has been set
- Revision in the VLAN Type (Ethernet, Token Ring, FDDI)
Client Advertisement Request is a request for VTP configuration from a client to a VTP server. In this case, a VTP server will respond by sending Summary and Subset Advertisement. This request will be requested because:
- It receives an advertisement summary with a higher revision number that itself.
- A subset advertisement is missed
- VTP domain name has been changed
- The switch has been reset or error
Hope this blog explains about the 3 types of VTP advertisements, their differences and usage.
Summary Advertisements are advertisements that are sent every 5 minutes from either a client or a server switch to its neighbors. It is also sent immediately when a configuration change has been made. Summary Advertisement contains the latest configuration from the switch. It contains several items which include:
- VTP domain name and revision
- Configuration revision number
- MD5 hash code
- Timestamp
- Number of subset advertisements that will follow
Subset advertisements are being sent by the VTP server when there is a change in the VLAN configuration or in response to an advertisement request. This will be sent when:
- A VLAN was created, deleted, activated, or suspended
- A VLAN has been renamed
- A new MTU unit has been set
- Revision in the VLAN Type (Ethernet, Token Ring, FDDI)
Client Advertisement Request is a request for VTP configuration from a client to a VTP server. In this case, a VTP server will respond by sending Summary and Subset Advertisement. This request will be requested because:
- It receives an advertisement summary with a higher revision number that itself.
- A subset advertisement is missed
- VTP domain name has been changed
- The switch has been reset or error
Hope this blog explains about the 3 types of VTP advertisements, their differences and usage.
Thanks for reminding me the forgotten vtp advertisement types.
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