Disable Dynamic Trunking Protocol on the trunk links of SW1.
SW1(config)#int range Fa0/13 - 21
SW1(config-if-range)#switchport trunk encapsulation dot1q
SW1(config-if-range)#switchport mode trunk
SW1(config-if-range)#switchport nonegotiate
SW1(config-if-range)#end
SW2(config)#int range Fa0/13 - 21
SW2(config-if-range)#switchport trunk encapsulation dot1q
SW2(config-if-range)#switchport mode trunk
SW2(config-if-range)#switchport nonegotiate
SW2(config-if-range)#end
SW3(config)#int range Fa0/13 - 21
SW3(config-if-range)#switchport trunk encapsulation dot1q
SW3(config-if-range)#switchport mode trunk
SW3(config-if-range)#switchport nonegotiate
SW3(config-if-range)#end
SW4(config)#int range Fa0/13 - 21
SW4(config-if-range)#switchport trunk encapsulation dot1q
SW4(config-if-range)#switchport mode trunk
SW4(config-if-range)#switchport nonegotiate
SW4(config-if-range)#end
Verify that trunking is still occurring between SW1 & SW2, SW1 & SW3, and SW1 & SW4 without the use of DTP.
SW1#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/13 on 802.1q trunking 146 Fa0/14 on 802.1q trunking 146 Fa0/15 on 802.1q trunking 146 Fa0/16 on 802.1q trunking 146 Fa0/17 on 802.1q trunking 146 Fa0/18 on 802.1q trunking 146 Fa0/19 on 802.1q trunking 146 Fa0/20 on 802.1q trunking 146 Fa0/21 on 802.1q trunking 146
SW2#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/6 on 802.1q trunking 1 Fa0/13 on 802.1q trunking 146 Fa0/14 on 802.1q trunking 146 Fa0/15 on 802.1q trunking 146 Fa0/16 on 802.1q trunking 146 Fa0/17 on 802.1q trunking 146 Fa0/18 on 802.1q trunking 146 Fa0/19 on 802.1q trunking 146 Fa0/20 on 802.1q trunking 146 Fa0/21 on 802.1q trunking 146
SW3#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/13 on 802.1q trunking 146 Fa0/14 on 802.1q trunking 146 Fa0/15 on 802.1q trunking 146 Fa0/16 on 802.1q trunking 146 Fa0/17 on 802.1q trunking 146 Fa0/18 on 802.1q trunking 146 Fa0/19 on 802.1q trunking 146 Fa0/20 on 802.1q trunking 146 Fa0/21 on 802.1q trunking 146
SW4#sh int trunk Port Mode Encapsulation Status Native vlan Fa0/13 on 802.1q trunking 146 Fa0/14 on 802.1q trunking 146 Fa0/15 on 802.1q trunking 146 Fa0/16 on 802.1q trunking 146 Fa0/17 on 802.1q trunking 146 Fa0/18 on 802.1q trunking 146 Fa0/19 on 802.1q trunking 146 Fa0/20 on 802.1q trunking 146 Fa0/21 on 802.1q trunking 146
Categories: IT, Networking, Switching