Configuring VLAN Trunks

Layer 2 Interface Modes

generate DTP frames. Use theswitchport trunk encapsulation dot1q interface to select the encapsulation type on the trunk port.

You can also specify on DTP interfaces whether the trunk uses IEEE 802.1Q encapsulation or if the encapsulation type is autonegotiated. The DTP supports autonegotiation of IEEE 802.1Q trunks.

Layer 2 Interface Modes

Table 10: Layer 2 Interface Modes

Mode

switchport mode access

switchport mode dynamic auto

switchport mode dynamic desirable

switchport mode trunk

switchport nonegotiate

switchport mode dot1q-tunnel

switchport mode private-vlan

Function

Puts the interface (access port) into permanent nontrunking mode and negotiates to convert the link into a nontrunk link. The interface becomes a nontrunk interface regardless of whether or not the neighboring interface is a trunk interface.

Makes the interface able to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to trunk or desirable mode. The default switchport mode for all Ethernet interfaces is dynamic auto.

Makes the interface actively attempt to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to trunk, desirable, or auto mode.

Puts the interface into permanent trunking mode and negotiates to convert the neighboring link into a trunk link. The interface becomes a trunk interface even if the neighboring interface is not a trunk interface.

Prevents the interface from generating DTP frames. You can use this command only when the interface switchport mode is access or trunk. You must manually configure the neighboring interface as a trunk interface to establish a trunk link.

Configures the interface as a tunnel (nontrunking) port to be connected in an asymmetric link with an IEEE 802.1Q trunk port. The IEEE 802.1Q tunneling is used to maintain customer VLAN integrity across a service provider network.

Configures the private VLAN mode.

Note The switchport mode private-vlan command option is not supported.

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Cisco Systems WSC2960XR48FPSI manual Layer 2 Interface Modes, Function
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WSC2960XR48FPSI specifications

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