Ccna routing and Switching Complete Study Guide

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Chapter 20 

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  Troubleshooting IP, IPv6, and VLANs

Access    Trunking is not allowed on a port set to access mode.

Auto    Will trunk to neighbor switch only if the remote port is set to on or to desirable 

mode. This creates the trunk based on the DTP request from the neighboring switch.

Desirable    This will trunk with all port modes except access. Ports set to dynamic desir-

able will communicate via DTP that the interface is attempting to become a trunk if the 

neighboring switch interface is able to become a trunk.

Nonegotiate    No DTP frames are generated from the interface. Can only be used if the 

neighbor interface is manually set as trunk or access.

Trunk (on)    Trunks with all switch port modes except access. Automatically enables trunk-

ing regardless of the state of the neighboring switch and regardless of any DTP requests.

Let’s check out the different options available on the S1 switch with the 

switchport 

mode dynamic

 command:

S1(config-if)#