VTP V3 - VTP VLAN configuration not allowed when device is not the primary server for vlan database?

[Ctheodore16]

This would be a simple and easy question if the switch wasn't already configured as the vtp domain master!

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 24 WS-C2960-24-S 15.0(2)SE10a C2960-LANLITEK9-M

cisco-c2960a(config)#vtp mode server vlan
Device mode already VTP Server for VLANS.

cisco-c2960a(config)#vtp mode server
Device mode already VTP Server for VLANS.

cisco-c2960a#sh vtp status | inc Server
VTP Operating Mode : Server

cisco-c2960a(config)#vlan 33
VTP VLAN configuration not allowed when device is not the primary server for vlan database.

[Rolf Fischer]

Hi,

VTPv3 has an additional protection from unintended database overrides. Every switch in a domain can be a VTP server but only one switch can be the primary server (new feature in v3) and VLAN changes are allowed only on the primary server. By default the switches are secondary servers, you need to configure one primary server (not reload-persistent!):

switch-enable-mode# vtp primary [force]

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/15-0_2_se/configuration/guide/scg2960/swvtp.html => "Configuring a VTP Version 3 Primary Server"

HTH
Rolf

[J. Diego Chacon M.]

I really don't think that the additional protection is required, but who am I to judge? Good news: Learned something new and my lab is set up.
Thanks!