vtp v2-mode — vlan configuration mode
vtp v2-mode no vtp v2-mode
VLAN Trunking Protocol (VTP)
This command places the device into VTP version 2 mode. All devices within a VTP domain must run the same version of VTP. You can simply configure this on one device (like the server VTP switch) and all devices will be reconfigured to version 2 via VTP, provided that all devices are v2-mode capable.