DTP - Sending of Frames

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Dynamic Trunking Protocol or DTP is used on Cisco IOS switches to negotiate if the interface should become an [access](/switchport-access) port or [trunk](/switchport-trunk).  By default DTP is enabled and the switch interfaces will be in “dynamic auto” or “dynamic desirable” mode. This means that whenever you receive a DTP packet that requests to form a trunk, your interface will be in trunk mode.

The following context sensitive help indicates the DTP mode in which you can configure a switch port.

```
SW2(config-if)#switchport mode dynamic ?
  auto       Set trunking mode dynamic negotiation parameter to AUTO
  desirable  Set trunking mode dynamic negotiation parameter to DESIRABLE
```

It is considered [best practice to disable DTP](/dtp-best-practice-to-disable) in a production network.  DTP is also involved in the configuration of [Switchport modes](/switchport-modes) and their resulting capabilities.


Links:

https://networklessons.com/switching/how-to-configure-trunk-on-cisco-catalyst-switch

https://networklessons.com/switching/cisco-dtp-dynamic-trunking-protocol-negotiation

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DTP

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