Lab Topology:
Please use the following topology to complete this lab exercise:
Task 1:
In preparation for the configuration, configure a hostname on Sw1 as well as Sw2.
Task 2:
Configure Sw1 so that auto-negotiation of trunking is set to dynamic auto.
Task 3:
Configure Sw2 so that auto-negotiation of trunking is set to dynamic desirable.
Task 4:
Verify your configurations with the appropriate show commands (illustrated in Task 3 below).
Configuration and Verification
Task 1:
For reference information on configuring hostnames, please refer to earlier labs.
Task 2:
Sw1#show int fast0/1 switchport
Name: Fa0/1
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
The interface is actually already set to dynamic auto, which is the default setting for this model of switch (yours may vary). Let’s put the command in anyway.
Sw1(config)#int fast0/1
Sw1(config-if)#switchport mode dynamic auto
Task 3:
NOTE: You need to have at least one switch set to either trunk or dynamic desirable for a trunk link to form.
Sw2#show int fast0/1 sw
Name: Fa0/1
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Sw2#show interface trunk
Sw2(config)#int fast0/1
Sw2(config-if)#switchport mode dynamic desirable
Sw2(config-if)#end
Sw2#show int fast0/1 switchport
Name: Fa0/1
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Sw2#show interface trunk
Port Mode Encapsulation Status Native vlan
Fa0/1 desirable n-802.1q trunking 1
The n indicates that it negotiated the encapsulation type.