How do I standardize the VTP version that runs on all switches in the VTP domain?
All switches in the same VTP domain must run the same version of VTP. It is possible that some switches in your network can not run VTP version 2. If this is the case, you must revert all switches to version 1 in order to use VTP with these switches. You must run CatOS version 3.1(1) or later in order to use VTP version 2. In order to set the VTP version, issue this command: set vtp v2 {enable | disable} Refer to Configuring VLANS: VTP Version 2 for more information on VTP versions.