DTP(动态链路聚集协议)

DTP

DTP（dynamic trunking protocol）动态链路聚集协议

DTP是 Cisco私有点到点协议，用来动态协商端口类型为Access或者Trunk。要完成自动协商，2端口必须在同一个VTPdomain中。每30s发送一次DTP的frame. 该协议仅在交换机间协商。

 

端口DTP模式

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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

 

在动态模式下关闭协商

Switch(config-if)#switchport nonegotiate

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

 

验证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