Cisco 2950 - Catalyst Switch Spezifikationen PDF herunterladen (Seite 516)

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Catalyst 2950 and Catalyst 2955 Switch Command Reference

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Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

switchport mode

The no switchport mode form resets the mode to dynamic desirable.

Trunk ports cannot coexist on the same switch.

To autonegotiate trunking, the interfaces must be in the same VTP domain. Trunk negotiation is managed

by the Dynamic Trunking Protocol (

DTP), which is a point-to-point protocol. However, some

internetworking devices might forward DTP frames improperly, which could cause misconfigurations.

To avoid this, you should configure interfaces connected to devices that do not support DTP to not

forward DTP frames, which turns off DTP.

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

configuration command to disable trunking.

• To enable trunking to 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.

• With GigaStack GBICs, dynamic trunking is only supported when two switches are connected by a

single GigaStack GBIC link. If trunking is required when more than two switches in a stack are

connected by GigaStack GBIC links, you must manually configure trunking in this manner:

–

Manually shut down the GigaStack port by using the shutdown interface configuration

command.

–

Manually configure trunk mode on the GigaStack port by using the switchport mode trunk

interface configuration command on both GBIC interfaces to cause the interfaces to become

trunks.

–

Use the no shutdown interface configuration command to bring up the GigaStack port.

Examples This example shows how to configure a port for access mode:

Switch(config-if)# switchport mode access

This example shows how set the interface to dynamic desirable mode:

Switch(config-if)# switchport mode dynamic desirable

This example shows how to configure a port for trunk mode:

Switch(config-if)# switchport mode trunk

You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC

command and examining information in the Administrative Mode and Operational Mode rows.

Related Commands Command Description

show interfaces

switchport

Displays the administrative and operational status of a switching (nonrouting)

port, including port blocking and port protection settings.

switchport access Configures a port as a static-access port.

switchport trunk Configures the trunk characteristics when an interface is in trunking mode.

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