Cisco - CCENT/CCNA R&S (100-105) - VLANs Part3. Dynamic Trunking Protocol (DTP) .23

Twenty third Video in a Series covering all elements of The Cisco Certified Entry Networking Technician (CCENT) 100-105 ICND1v3 which is the first part of the CCNA certification.

Blueprint Section: LAN Switching Fundamentals

In this video we dive deeper into understanding trunking by looking at the dynamic trunking protocol (DTP). We first look at some key facts regarding the protocol and what it allows us to achieve then review the modes.

-Cisco proprietary feature allowing switches to negotiate trunks dynamically
-On by default, even when trunks are statically configured
-Depending on Switch model/make ISL is normally the default but now a days it is Dot1q
-Administrate Mode Vs.Operational Mode
-DTP carries VTP information

There are five different modes.

-Access (End clients)
-Trunk (Hard set to trunk)
-Dynamic Auto (Passively accepts DTP packets, prefers to be access port)
-Dynamic Desirable (Actively send DTP packets, prefers to be a trunk port)
-Non-negotiate (Turn off DTP)

We also spent some time reviewing VTP as an overview along with a further discussion around trunks and access ports

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[rayakoth]

Thank you Ryan. I will probably need to watch your videos 2-3 times but I am liking it so far.

[Tony_A_]

Good video and overview of DTP, got to do a deeper dive into this material.

[auntiecarol]

In dynamic auto you say DTP "packets". Do you not mean "frames" (DTP working at level 2)?

[mytruefreethoughts]

I'm trying to think of a good way to memorize this. Please let me know what you think.

Auto starts with an 'A' so it prefers to be an 'Access' port, as well as passively 'Accepts' DTP packets
Desirable is the only one left out, and thus is the rest, so it has to prefer to be a Trunk, but also in the acronym of Dynamic Trunking Protocol, which is DTP, the DT is Dynamic Trunk or "Desirable' (prefers) Trunk, and sends DTP info.