Overview
Dynamic Trunking Protocol (DTP) could be a Cisco proprietary protocol, that when enabled and configured
properly, uses advertisements to contact the start switch on finish of the link, and auto-negotiate a switchport to
either an access or trunk link. once a switchport on either finish of the link is misconfigured you may find yourself
with a broken link (see chart below). DTP is enabled by default on the Cisco switches that are unremarkably used
in the CCNA program. There are four switchport modes that DTP can talk over with so as to work out whether or
not the link are a trunk or an access link, the four modes are: Access, Trunk, Dynamic auto, and Dynamic
desirable. The default switchport mode once DTP is enabled is Dynamic auto. If each switches on either finish of
a link have DTP enabled, and each switchports are by default in Dynamic auto mode then the ensuing link modes
are Access on each ends of the link. in contrast, if one switchport, on one finish of the link, is in Dynamic auto
mode, and therefore the different switchport on the opposite finish of the link, is configured for Trunk mode, then
the DTP negotiation can end in the Dynamic auto switchport dynamical its mode to Trunk mode and therefore the
link can become a trunk.See the chart below for the result once 2 DTP enabled Cisco switches talk over
switchport modes. Since only Cisco switches support DTP, once connecting to a non-Cisco switch DTP ought to
be disabled.
Dynamic Trunking
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