DTP

    DTP（dynamic trunking protocol）動態(tài)鏈路聚集協(xié)議

    DTP是 Cisco私有點到點協(xié)議，用來動態(tài)協(xié)商端口類型為Access或者Trunk，

DTP(動態(tài)鏈路聚集協(xié)議)

。要完成自動協(xié)商，2端口必須在同一個VTPdomain中。每30s發(fā)送一次DTP的frame. 該協(xié)議僅在交換機間協(xié)商。

    端口DTP模式

    wKiom1XZM92yY1_TAAOWUGlng3A983.jpg

    配置DTP

    Switch(config-if)#switchportmode ?

    access  Set trunking mode to ACCESS unconditionally

    dynamic Settrunking mode to dynamically negotiate access or trunk mode

    trunk   Set trunking mode to TRUNKunconditionally

    在動態(tài)模式下關(guān)閉協(xié)商

    Switch(config-if)#switchport nonegotiate

    Command rejected: Conflict between 'nonegotiate'and 'dynamic' status.

    驗證DTP

    Switch#showinterface switchport

    Name:Fa0/1

    Switchport:Enabled

    Administrative Mode: dynamic auto

    OperationalMode: down

    Administrative Trunking Encapsulation: dot1q

    OperationalTrunking Encapsulation: native

    Negotiationof Trunking: On