03-18-2012 02:22 PM - edited 03-07-2019 05:38 AM
Hi everybody.
Let say we have two brand switches ,sw1 and sw2 and we connect them as :
s1-----------s2
will trunk form between them?
In other words is dtp enabled on switch port by default or do we need to configure it as " switchport mode dynamic desirable/auto" ?If yes then what mode i.e auto dynamic desirable
thanks and have a great weekend
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03-18-2012 03:11 PM
Hi Sarah,
Hope you well and congrats on your Route exam.
Now to your question. The switchports are in a state of "dynamic desirable" out of the box. So if you just connect them with a cat cable, you will see the trunk would be formed. and yes DTP is enabled in the dynamic desirable mode and that's how the switches negotiate to become a trunk.
The best way to see what mode the ports are would be type the command " sh interfaces
HTH
Kishore
03-18-2012 02:55 PM
if they're Cisco switches, then yes a trunk is formed because of the dynamic desirable mode on both ends of the link. If its a non-Cisco switch on either end, a trunk won't form automatically that I'm aware of. Usually you have to hard code the mode to trunk on the Cisco switch and the same the on te other side. Then you would disable DTP by setting switchport nonegotiate on the link that connects to the other switch.
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03-18-2012 03:11 PM
Hi Sarah,
Hope you well and congrats on your Route exam.
Now to your question. The switchports are in a state of "dynamic desirable" out of the box. So if you just connect them with a cat cable, you will see the trunk would be formed. and yes DTP is enabled in the dynamic desirable mode and that's how the switches negotiate to become a trunk.
The best way to see what mode the ports are would be type the command " sh interfaces
HTH
Kishore
03-18-2012 03:36 PM
Thanks Kishore
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