Lab 5. Switching - Trunk Ports without DTP

Objective: Configure an ISL trunk between SW1 and SW2 without DTP (Dynamic Trunking Protocol)

SW1:

SW1(config)#int e0/0

SW1(config-if)#switchport trunk encapsulation isl

SW1(config-if)#switchport mode trunk

SW1(config-if)#switchport nonegotiate

SW2:

SW2(config)#int e0/0 

SW2(config-if)#switc trun encap isl

SW2(config-if)#swit mode trun

SW2(config-if)#switc nonegoti

Verify the switchport and trunk

SW1(config-if)#do sh int trun

Port                Mode         Encapsulation  Status        Native vlan

Et0/0               on              isl            trunking      1

Port                Vlans allowed on trunk

Et0/0               1-4094

Port                Vlans allowed and active in management domain

Et0/0               1

Port                Vlans in spanning tree forwarding state and not pruned

Et0/0               1

Name: Et0/0SW1(config-if)#do sh int e0/0 switch

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: isl

Operational Trunking Encapsulation: isl

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: Off

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

...

SW2(config-if)#do sh int trunk

Port                Mode         Encapsulation  Status        Native vlan

Et0/0               on              isl                    trunking      1

Port                Vlans allowed on trunk

Et0/0               1-4094

Port                Vlans allowed and active in management domain

Et0/0               1

Port                Vlans in spanning tree forwarding state and not pruned

Et0/0               1

SW2(config-if)#do sh int e0/0 switc

Name: Et0/0

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: isl

Operational Trunking Encapsulation: isl

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: Off

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled