Cisco Cisco IOS Software Release 12.2(55)SE

We recommend placing VTP version 1 and 2 switches at the edge of the network because they do 
not forward VTP version 3 advertisements.

If there are TrBRF and TrCRF Token Ring networks in your environment, you must enable VTP 
version 2 or version 3 for Token Ring VLAN switching to function properly. To run Token Ring and 
Token Ring-Net, disable VTP version 2.

VTP version 1 and version 2 do not propagate configuration information for extended range VLANs 
(VLANs 1006 to 4094). You must manually configure these VLANs on each device. VTP version 3 
supports extended-range VLANs. You cannot convert from VTP version 3 to VTP version 2 if 
extended VLANs are configured.

When a VTP version 3 device trunk port receives messages from a VTP version 2 device, it sends a 
scaled-down version of the VLAN database in VTP version 2 format on that particular trunk. A VTP 
version 3 device does not send VTP version 2-formatted packets on a trunk unless it first receives 
VTP version 2 packets on that trunk port.

When a VTP version 3 device detects a version 2 device on a trunk port, it continues to send version 
3 packets in addition to VTP version 2 packets, allowing both kinds of neighbors to co-exist on the 
same trunk.

A VTP version 3 device does not accept configuration information from a VTP version 2 or 
version 1 device.

Two VTP version 3 regions can communicate only in transparent mode over a VTP version 1 or 
version 2 region.

Devices that are only VTP version 1 capable cannot interoperate with VTP version 3 devices.

When you enable VTP version 2 on a switch, every VTP version 2-capable switch in the VTP 
domain enables version 2. To enable VTP version 3, you must manually configure it on each switch.

With VTP versions 1 and 2, you can configure the version only on switches in VTP server or 
transparent mode. If a switch is running VTP version 3, you can change to version 2 when the switch 
is in client mode if no extended VLANs exist, no private VLANs exist, and no hidden password was 
configured.

VTP version 3 is supported on switches running Cisco IOS Release 12.2(55) SE or later.

In VTP version 3, both the primary and secondary servers can exist on an instance in the domain.

Beginning in privileged EXEC mode, follow these steps to configure the VTP version:

Enter global configuration mode.

vtp version {1 | 2 | 3}

Enable the VTP version on the switch. The default is VTP version 1. 

Return to privileged EXEC mode.

Verify that the configured VTP version is enabled.

(Optional) Save the configuration in the startup configuration file. 

To return to the default VTP version 1, use the no vtp version global configuration command.