DTP on trunk

OCG says "Administratively configure access ports as access ports so that users cannot negotiate a trunk and disable the negotiation of trunking (no Dynamic Trunking Protocol [DTP] )."

Does this mean don't use DTP for anything or leave it on only for trunk ports?

Thanks.

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Comments

mdomino

It's following the best practice that all switchports should be configured as their intended use of access or trunk. They're saying not to leave ports in dynamic desirable/dynamic auto. If you want a port to be a trunk then configure it as such with

config-if)# switchport mode trunk

sendalot

if I take off DTP off of everything. would trunking be affected?

EdTheLad

DTP Dynamic Trunking Protocol, it's link local, used to negotiate a trunk. If the link is an access link disable it, if the link is administratively set to trunk, disable it, if you intend to negotiate trunking, leave it enabled.
I recommend to set all trunk ports manually and disable DTP everywhere unless you have a specific requirement that needs trunks negotiated.