DTP (Dynamic Trunking Protocol)

DTP negotiates trunking between Cisco switches/ports automatically.

Updated: 2026-03-05

Definition

DTP can dynamically form trunk links if both sides are configured for negotiation.

Security best practice is often to disable DTP and hard-set trunk/access mode.

Key points

Cisco trunk negotiation protocol
Auto/desirable can form trunks
Disable when not needed (security hardening)

Common mistakes

Unexpected trunk formation due to auto settings.
Assuming DTP works with non-Cisco devices.

Related exams

Cisco CCNA (200-301)

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