Dynamic Trunking Protocol DTP .... which goes with which

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

Trying to find a which combinations of DTP produce turnks or access ports on switch.
I try to memorize how the combination match up but it just to much is there an easy way to do it


I tried to compare it to talking over takes listening as in (trunking - listening , access - talking) but it not a easy, can any one help me remember this stuff an easy way like some kind of trick or mnemonic way.

Access
Trunk
Dynamic Auto
Dynamic Desirable
Nonegotiate

 

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

Can't help with a mnemonic.....but just to let you know it is call Dynamic Trunking Protocol.

 

I was typing too fast I fixed it

 

I have never come across a mnemonic for this, just lab it to remember it

Trunk and access are port states

Dy Des and Dy Auto are Cisco protocols which are used to negociate a port into either trunk or access states

noneg turns the DTP process off on the port

If you can't find a mnemonic.

Dy Des + Dy Des = TRUNK

Dy Des + Dy Auto = TRUNK

Dy Auto + Dy Auto = STATIC ACCESS

TRUNK (DTP on) + Dy Des = TRUNK

TRUNK (DTP on) + Dy Auto = TRUNK

TRUNK (No Auto) + Dy Des = STATIC ACCESS

TRUNK (No Auto) + Dy Auto= STATIC ACCESS


Dy Des + SA = SA

Dy Des + SA = SA

Dy AUTO + SA = SA

You would never want to put Truck againest a static access port

 

I think I figured it out ...
from the way I see it
Access is also most powerful, ... cause anytime it is set with another DTP port setting it will always be forced to Access port
Trunk and Dyn Des are the next most powerful DTP port type, cause all settings go to trunk except if matchup with a Access port
Dyn Auto is always listening and will do what ever the apposing DTP port setting is set to so when the apposing port setting is it self Dyn Auto - its set to Access port.

Posts welcome to oppose or agree with the my logic understanding of DTP

 

An Access port is one into which you would plug an end user device such as a PC or laptop, this port will receive frames which are not marked which any vlan id (Either Dot1q or ISL) therefore since no vlan marker exists in the frame it is placed into the native vlan of the port as defined by the command
switchport access vlan "VID"

To make a port a Access port you would have to run the command
"switchport mode access"
The above command will turn DTP off on that port and will not be able to negociate. This is the best and safest setting for all user ports

Trunk ports are interface which carry frames from one switch to another with the Vlan id (Either Dot1q or ISL) in the frame so the receiving switch can identify the vlan which the frame belongs to.

Yes, Dyn Auto is listening and will reply only when it receives a DTP frame, it a reactive setting as opposed to Dyn Des which is proactive in sending DTP frames.
Dyn Auto set itself to Trunk if it receives a DTP frame or Static Access if it does not.

Hope this helps