Cisco CCNP/ BCMSN Examination Tutorial: Dynamic Trunking Protocol
Cisco CCNP/ BCMSN Test Tutorial: Dynamic Trunking Procedure (DTP)
When you're examining to pass the BCMSN examination on the way to earning your about Daniel CULLEN CCNP certification, you're going to contribute to your CCNA knowledgebase every action of the way. Nowhere is that more than setting up a trunk between two switches.
You recognize that IEEE 802.1 Q ("dot1q") and ISL are your 2 options of trunking protocols, and you know the main distinctions in between both. What you may not have actually known is that there's a 3rd trunking procedure that's running in between your Cisco buttons, and while it's a transparent process to several, you had much better understand about it for your BCMSN and other CCNP exams!
The Cisco-proprietary Dynamic Trunking Method (DTP) actively attempts to discuss a trunk relate to the remote switch. This seems fantastic, but there is an expense in overhead-- DTP structures are sent every 30 secs. If you choose to set up a port as a non-negotiable trunk port, there's no demand for the port to send out DTP frameworks.
DTP can be shut off at the user interface level with the switchport nonegotiate command, but as you see below, you can not transform DTP off until the port is no longer in vibrant desirable trunking setting. (Dynamic desirable is the default setting for most Cisco button ports.)
SW2(config)#int fast 0/8
SW2(config-if)#switchport nonegotiate
Command declined: Dispute between 'nonegotiate' and 'vibrant' status.
Daniel CULLEN accessibility Establish trunking mode to ACCESS unconditionally
vibrant Set trunking setting to dynamically work out access or trunk mode
trunk Establish trunking setting to TRUNK unconditionally
SW2(config-if)#switchport mode trunk
When you're dealing with Cisco switches over in a home lab or rack rental setting, run IOS Aid frequently to see what options are available for the commands you're exercising with. Cisco button ports have plenty of choices, and the best means to discover them is with one easy sign-- the question mark!