Lab 4. Switching - 802.1q Trunk Ports and the Native VLAN

Objective: Configure an 802.1q trunk between SW1 and SW2 with VLAN 20 as the native VLAN 

SW1:

SW1(config)#int e0/0

SW1(config-if)#switch trun encap dot1

SW1(config-if)#switch trun native vlan 20

SW1(config-if)#switchport mode trunk

SW1(config-if)#no shu

SW2:

SW2(config)#int e0/0

SW2(config-if)#switch trun encap dot

SW2(config-if)#switch trunk nati vla 20

SW2(config-if)#switch mode trunk

SW2(config-if)#no shu

Verify the switchport and trunk 

SW1#sh int e0/0 switch

Name: Et0/0

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 20 (Inactive)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

...

SW1#sh int trunk

Port                Mode         Encapsulation  Status        Native vlan

Et0/0               on              802.1q            trunking      20

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#sh int e0/0 swit

Name: Et0/0

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 20 (Inactive)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

...

SW2#sh int trun

Port                Mode         Encapsulation  Status        Native vlan

Et0/0               on              802.1q           trunking      20

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

Lab 3. Switching - 802.1q Trunk Ports

Objective: Configure an 802.1q trunk between SW1 and SW2

SW1:

SW1(config)#default int e0/0                        ----> to restore int e0/0 to default setting

SW1(config)#int e0/0

SW1(config-if)#switchport mode dynamic desirable

SW1(config-if)#no shu

SW2: 

SW2(config)#int e0/0

SW2(config-if)#switchport trunk encapsulation dot1q

SW2(config-if)#switc mode trun

SW2(config-if)#no shut

Verify the switchport and trunk

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

Name: Et0/0

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: trunk

Administrative Trunking Encapsulation: negotiate

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

  

SW1(config-if)#do sh int statu | i Port|Et0/0

Port         Name               Status       Vlan       Duplex  Speed Type

Et0/0                               connected    trunk        auto   auto   10BaseTX

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

Name: Et0/0

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: trunk

Administrative Trunking Encapsulation: negotiate

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative Native VLAN tagging: enabled

Operational Native VLAN tagging: disabled

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

 ...

SW1(config-if)#do sh int trunk              

Port                Mode         Encapsulation  Status        Native vlan

Et0/0               desirable    n-802.1q       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 status | i Port|Et0/0

Port         Name               Status          Vlan       Duplex  Speed Type

Et0/0                                connected    trunk        auto   auto  10BaseTX

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

Name: Et0/0

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Operational Dot1q Ethertype:  0x8100

Negotiation of Trunking: On

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 trun

Port                Mode         Encapsulation  Status        Native vlan

Et0/0               on              802.1q            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