PingingLab-3.5 Basic DTP Configuration

3.5 Basic DTP Configuration

Purpose:

1. master the basic configuration of DTP.

2. Understand the DTP interface mode and principle.

Tutorial topology:

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Tutorial steps:

1. DTP negotiation modes are mainly divided into four types:

DD: in active mode, the interface sends DTP groups for negotiation;

DA: passive mode. The interface receives DTP groups for negotiation;

On: Generally, if the interface is forcibly set to trunk, it is in on mode;

Off: If the interface is forcibly configured as access, the off mode is used;

Based on these modes, different negotiation results can be obtained, as shown below:

	Dynamic Auto	Dynamic Desirable	Trunk/on	Access/off
Dynamic Auto	Access	Trunk	Trunk	Access
Dynamic Desirable	Trunk	Trunk	Trunk	Access
Trunk/on	Trunk	Trunk	Trunk	Not recommended
Access/off	Access	Access	Not recommended	Access

2. Deploy the DTP protocol on SW1 and SW2 based on the above table, and view the negotiation status of the Trunk link;

① Example 1: DD & DD

SW1 (config) # int f0/1

SW1 (config-if) # switchport trunk encapsulation dot1q

SW1 (config-if) # switchport mode dynamic desirable

SW1 (config-if) # exit

SW2 (config) # int f0/1

SW2 (config-if) # switchport trunk encapsulation dot1q

SW2 (config-if) # switchport mode dynamic desirable

SW2 (config-if) # exit

Check the Trunk negotiation status of the vswitch:

② Example 2: DD & DA

SW1 (config) # int f0/1

SW1 (config-if) # switchport trunk encapsulation dot1q

SW1 (config-if) # switchport mode dynamic desirable

SW1 (config-if) # exit

SW2 (config) # int f0/1

SW2 (config-if) # switchport trunk encapsulation dot1q

SW2 (config-if) # switchport mode dynamic auto

SW2 (config-if) # exit

Check the Trunk negotiation status of the vswitch:

③ Example 3: DA & DA

SW1 (config) # int f0/1

SW1 (config-if) # switchport trunk encapsulation dot1q

SW1 (config-if) # switchport mode dynamic auto

SW1 (config-if) # exit

SW2 (config) # int f0/1

SW2 (config-if) # switchport trunk encapsulation dot1q

SW2 (config-if) # switchport mode dynamic auto

SW2 (config-if) # exit

Check the Trunk negotiation status of the vswitch:

......

Other negotiation procedures are omitted.

3. Engineering usage. From the above, we can see that DTP can negotiate with Trunk in different modes, but DTP is a CISCO private technology. If there are switches from other vendors in the network, it cannot be negotiated, for example, if the access layer switch uses an H3C switch and the aggregation layer uses a CISCO switch, DTP is meaningless. Therefore, the general engineering usage habits directly set the interface to trunk, and disable DTP negotiation, as follows:

SW1 (config) # int f0/1

SW1 (config-if) # switchport trunk encapsulation dot1q

SW1 (config-if) # switchport mode trunk

SW1 (config-if) # switchport nonegotiate

SW2 (config) # int f0/1

SW2 (config-if) # switchport trunk encapsulation dot1q

SW2 (config-if) # switchport nonegotiate

This experiment is complete.

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