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

 

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