Lab Objective:
The objective of this lab exercise is for you to learn and understand how to turn off the auto-negotiation of a trunk link.
Lab Purpose:
Switch interfaces are set to automatically attempt to create a trunk link when connected to another switch. You need to know how to disable this behavior. Note that this behavior varies depending on the switch model.
Certification Level:
This lab is suitable for the CCENT certification exam preparation.
Lab Difficulty:
This lab has a difficulty rating of 5/10.
Readiness Assessment:
When you are ready for your certification exam, you should complete this lab in no more than 15 minutes.
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 disabled. Set the port to manually trunk.
Task 3:
Verify your configuration with the appropriate show commands.
Configuration and Verification
Task 1:
For reference information on configuring hostnames, please refer to earlier labs.
Task 2:
Sw1#show interface fast0/1 switchport Name: Fa0/1 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: down Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Sw1(config)#int fast0/1 Sw1(config-if)#switchport nonegotiate Command rejected: Conflict between ‘nonegotiate’ and ‘dynamic’ status. Sw1(config-if)#switchport mode trunk Sw1(config-if)#switchport nonegotiate Sw1(config-if)#end
Task 3:
NOTE: As you can see above, the interface cannot be left to dynamically become a trunk or access port if you want to disable auto-negotiation of trunking.
Sw1#show int fast0/1 switchport Name: Fa0/1 Switchport: Enabled Administrative Mode: trunk Operational Mode: down Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: Off Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Voice VLAN: none