Dynamic Trunking Protocol (DTP) is the Cisco-proprietary protocol that actively attempts to negotiate a trunk link between two switches. Below is the switchport modes (or DTP modes) for easy reference:
| Mode | Function |
| Dynamic Auto | Creates the trunk based on the DTP request from the neighboring switch. |
| Dynamic Desirable | Communicates to the neighboring switch via DTP that the interface would like to become a trunk if the neighboring switch interface is able to become a trunk. |
| Trunk | Automatically enables trunking regardless of the state of the neighboring switch and regardless of any DTP requests sent from the neighboring switch. |
| Access | Trunking is not allowed on this port regardless of the state of the neighboring switch interface and regardless of any DTP requests sent from the neighboring switch. |
| Nonegotiate | Prevents the interface from generating DTP frames. This command can be used only when the interface switchport mode is access or trunk. You must manually configure the neighboring interface as a trunk interface to establish a trunk link. |
Below figure shows the combination of different modes
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