DTP - Sending of Frames

DTP - best practice to disable


Dynamic Trunking Protocol or [DTP](/dtp) is automatically enabled on all Cisco IOS switches.  Even if a port is explicitly set to `trunk`,  DTP is still enabled on such ports, and negotiation will take place if the `dynamic` keyword is used on the remote switch.

In order to completely disable the sending and receiving of DTP messages on the port of a switch, one of two things must be configured:

1) A port must be explicitly configured as an [access](/switchport-access) port.
2) A [trunk](/switchport-trunk) port must be configured using the `switchport nonegotiate` command.


Links:

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

DTP - how to disable

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DTP - how to disable

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