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Guidelines to configure VTP version in your Network

Today I am going to talk about the recommendation for the VTP version to configure on your network. Make sure if you are going to implement the VTP version in your switched network you should know the guidelines. 

Make sure all devices in a VTP domain essential have the same domain name, but they do not need to run the same VTP version. 

Fig 1.1- VTP Network Topology
Below are the basic guidelines when you are configuring VTP V1, v2 or v3 in your network. 
  • A VTP version 2-capable device can work in the same VTP domain as a device controlling VTP version 1 if version 2 is disabled on the version 2-capable device (version 2 is disabled by default).
  • I hope you guys know that If a device running VTP version 1, but qualified of running VTP version 2, receives VTP version 3 advertisements, it spontaneously moves to VTP version 2
  • If a device running VTP version 3 is linked to a device running VTP version 1, the VTP version 1 device changes to VTP version 2, and the VTP version 3 device sends scaled-down versions of the VTP packets so that the VTP version 2 device can update its database.
  • Cisco endorses insertion of VTP version 1 and 2 devices at the edge of the network because they do not forward VTP version 3 advertisements
  • A device running VTP version 3 cannot move to version 1 or 2 if it has extended VLANs
  • Do not enable VTP version 2 on a device unless all of the devices in the same VTP domain are version-2-capable. When you enable version 2 on a device, all of the version-2-capable devices in the domain enable version 2. If there is a version 1-only device, it does not exchange VTP information with devices that have version 2 enabled.
  • VTP version 1 and version 2 do not broadcast configuration data for extended range VLANs (VLANs 1006 to 4094). You must design these VLANs physically on each device. VTP version 3 supports extended-range VLANs and support for extended range VLAN database propagation.
  • When a VTP version 3 device trunk port accepts messages from a VTP version 2 device, it sends a scaled-down version of the VLAN database on that precise trunk in VTP version 2 format. A VTP version 3 device does not send VTP version 2-formatted packets on a trunk unless it first accepts VTP version 2 packets on that trunk port.
  • When a VTP version 3 device detects a VTP version 2 device on a trunk port, it endures to send VTP version 3 packets, in count to VTP version 2 packets, to permit both kinds of neighbors to coexist on the same trunk.
  • A VTP version 3 device does not accept configuration data from a VTP version 2 or version 1 device, Two VTP version 3 regions can only communicate in transparent mode over a VTP version 1 or version 2 region and Devices that are only VTP version 1 capable cannot interoperate with VTP version 3 devices.
  • VTP version 1 and version 2 do not propagate configuration data for extended range VLANs (VLANs 1006 to 4094). You must manually configure these VLANs on each device