Cisco Dynamic Trunk Protocol (DTP) is all of the Cisco's agreement in the VLAN group, mainly used to negotiate relay processes on inter-device links and relay packages 802.1q types.
There are many different types of relay agreements. If the port is set to the Trunk port, then the port has an automatic relay function, in some cases, even with the function of the negotiation port relay type. This process of negotiating relay methods between other devices is called dynamic relay techniques.
First of all, the TRUNK CABLE terminal is preferably consecutive to them, or they have agreed to the normal frame problem. In addition to adding tag information in the information frame header, it is easy to cause confusion of the terminal station because the label information cannot be identified by the drive stack of the terminal station, resulting in a terminal system to lock or fail. To solve this problem, Cisco creates a swap protocol to implement communication purposes. The first version of the launched is VTP, ie the VLAN relay protocol, which works with the ISL. The latest version, that is, the dynamic relay protocol DTP and 802.1q work together.
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