DTP
DTP（dynamic trunking protocol）動(dòng)態(tài)鏈路聚集協(xié)議
DTP是 Cisco私有點(diǎn)到點(diǎn)協(xié)議，用來(lái)動(dòng)態(tài)協(xié)商端口類型為Access或者Trunk，
DTP(動(dòng)態(tài)鏈路聚集協(xié)議)
。要完成自動(dòng)協(xié)商，2端口必須在同一個(gè)VTPdomain中。每30s發(fā)送一次DTP的frame. 該協(xié)議僅在交換機(jī)間協(xié)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
在動(dòng)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(yàn)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