At what intervals are DTP frames sent during the negotiation phase?

During the negotiation phase of Dynamic Trunking Protocol (DTP), frames are sent every 1 second to facilitate the establishment of trunk links between switches. This high frequency ensures that the switches can quickly negotiate the correct trunking status, allowing them to efficiently form trunk links and share VLAN information.

Once the trunk is established and the negotiation phase has been completed, DTP frames are then sent at a reduced interval of every 30 seconds. This change in the sending frequency between the negotiation phase and the normal operational state reflects the need for frequent communication during the initial negotiations while requiring less frequent updates once the connection is stable.

Understanding this behavior of DTP is essential for network engineers in managing switch configurations and ensuring efficient data flow across VLANs in a network environment.