Cisco CCNP BCMSN Exam Tutorial Dynamic Trunking Protocol DTP
Below is a MRR and PLR article in category Computers Technology -> subcategory Computer Certification.
Cisco CCNP/BCMSN Exam Guide: Dynamic Trunking Protocol (DTP)
Overview
Understanding the Dynamic Trunking Protocol (DTP) is essential for passing the BCMSN exam as part of your CCNP certification. Although DTP works behind the scenes, grasping its intricacies is crucial.
Key Concepts
Trunking Protocols
While preparing for the BCMSN exam, you'll build on your CCNA knowledge, especially regarding switch configuration. You likely know that IEEE 802.1Q (dot1q) and ISL are popular trunking protocols. However, there's a lesser-known, Cisco-specific protocol at play: the Dynamic Trunking Protocol (DTP).
Dynamic Trunking Protocol (DTP)
DTP is unique to Cisco and seeks to establish trunk links between switches automatically. While convenient, DTP adds overhead, transmitting frames every 30 seconds. If you manually set a port as a non-negotiable trunk, DTP frames become unnecessary.
Disabling DTP
To disable DTP at the interface level, use the `switchport nonegotiate` command. Note that DTP must not be in dynamic desirable mode beforehand, as this is the default for most Cisco switches.
Example
```plaintext
SW2(config)
interface fast0/8
SW2(config-if)switchport nonegotiate
Command rejected: Conflict between 'nonegotiate' and 'dynamic' status.SW2(config-if)
switchport mode ?
access Set trunking mode to ACCESS unconditionallydynamic Set trunking mode to dynamically negotiate access or trunk mode
trunk Set trunking mode to TRUNK unconditionally
SW2(config-if)
switchport mode trunk
SW2(config-if)switchport nonegotiate
```Practical Tips
When setting up Cisco switches in a lab environment, frequently use IOS Help. This tool reveals available command options, assisting you in mastering various switch port settings. Utilize the question mark "?" to explore different configurations efficiently.
By understanding these elements of DTP, you'll be better equipped to tackle the BCMSN exam and further your networking career.
You can find the original non-AI version of this article here: Cisco CCNP BCMSN Exam Tutorial Dynamic Trunking Protocol DTP .
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