Catalyst Switch: Turn off trunking negotiation

To turn off dynamic trunking protocol (DTP) and use dot1q standard.

Sw2-3560#conf t
Sw2-3560(config)#int range gi0/1-2
Sw2-3560(config-if-range)#switchport trunk encapsulation dot1q
Sw2-3560(config-if-range)#switchport mode trunk
Sw2-3560(config-if-range)#switchport nonegotiate
Sw2-3560(config-if-range)#exit
Sw2-3560(config)#

It is recommended to turn off trunking protocol and put vtp to transparent mode, this is because a newly introduced Catalyst switch may form undesired switch topology and if the newly introduced Catalyst switch has a vtp revision number higher than the current switch VTP revision then all vlan database of current switches will be overwritten.

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