Name: Cisco Catalyst 3750-X
Brand: Cisco
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Catalyst 3750-X and 3560-X Switch Command Reference

OL-29704-01

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands

switchport nonegotiate

Use the switchport nonegotiate interface configuration command on the switch stack or on a standalone

switch to specify that Dynamic Trunking Protocol (DTP) negotiation packets are not sent on the Layer 2

interface. The switch does not engage in DTP negotiation on this interface. Use the no form of this

command to return to the default setting.

switchport nonegotiate

no switchport nonegotiate

Syntax Description This command has no arguments or keywords.

Defaults The default is to use DTP negotiation to learn the trunking status.

Command Modes Interface configuration

Command History

Usage Guidelines The no form of the switchport nonegotiate command removes nonegotiate status.

This command is valid only when the interface switchport mode is access or trunk (configured by using

the switchport mode access or the switchport mode trunk interface configuration command). This

command returns an error if you attempt to execute it in dynamic (auto or desirable) mode.

Internetworking devices that do not support DTP might forward DTP frames improperly and cause

misconfigurations. To avoid this, you should turn off DTP by using the switchport no negotiate

command to configure the interfaces connected to devices that do not support DTP to not forward DTP

frames.

When you enter the switchport nonegotiate command, DTP negotiation packets are not sent on the

interface. The device does or does not trunk according to the mode parameter: access or trunk.

• If you do not intend to trunk across those links, use the switchport mode access interface

configuration command to disable trunking.

• To enable trunking on a device that does not support DTP, use the switchport mode trunk and

switchport nonegotiate interface configuration commands to cause the interface to become a trunk

but to not generate DTP frames.

Release Modification

12.2(53)SE2 This command was introduced.

Cisco Catalyst 3750-X Command Reference

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