Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual de usuario descargar pdf (Pagina 20)

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IOS(Config-if)# switchport access vlan 2

IOS(Config-if)# no shut

IOS(Config-if)# end

Trunk Switchport

Trunk switchports in Cisco IOS Software are Layer 2 ports that carry multiple VLANs using ISL or

IEEE 802.1q encapsulations. They are fully compatible with any other device supporting the ISL or

IEEE 802.1q protocols.

After converting a routed interface to a Layer 2 switchport, the switchport will default to switchport

mode dynamic desirable. The port is capable of forming a trunk with a neighboring Layer 2 device

by using DTP for negotiating a trunk. If the neighboring interface supports trunking and is

configured to allow trunking, the link becomes a Layer 2 trunk when you enter the switchport

command (because of the dynamic/desirable default). By default, trunks negotiate encapsulation.

If the neighboring interface supports both ISL and IEEE 802.1q encapsulation and both interfaces

are set to negotiate the encapsulation type, the trunk will use ISL encapsulation. This is the same

operation as in the Cisco Catalyst OS. The following example shows how to configure a trunk for

IEEE 802.1q encapsulation:

IOS# configure terminal

IOS(Config)# interface fastethernet 5/1

IOS(Config-if)# switchport

IOS(Config-if)# switchport trunk encapsulation dot1q

IOS(Config-if)# end

For details on the different trunk negotiation states, refer to the Cisco IOS Software Configuration

Guide at

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/12_1e/swconfig/layer2.htm.

Note: Recommended configuration for a dynamic trunk port would be desirable/auto between

neighboring devices.

The switchport trunk native vlan <vlan-id> command sets the native VLAN for an IEEE 802.1q

trunk port. The allowed parameter can be used to control the VLANs that are forwarded out that

interface. In addition, the pruning parameter can be used to control VTP pruning on the link.

VLAN1 cannot be pruned, either in the Cisco Catalyst OS or in Cisco IOS Software. However, both

Cisco IOS Software and the Cisco Catalyst OS allow VLAN1 to be disabled from carrying traffic on

trunks.

If a no switchport command is offered, all the commands related to that switchport will no longer

show in configuration and the interface type will revert to a routed interface. However, if the

switchport is reenabled, then all the previous switchport-related commands will still be reinstated.

Cisco IOS Software Interface Configuration: Range Command

All interface types, whether routed interfaces, SVIs, or switchports, can be configured in groups.

This means you can apply configuration parameters to a group of ports at once. The Cisco IOS

Software range command allows you to configure multiple interfaces simultaneously by specifying

interface range and then the range of ports. The ports in the range can be discontinuous across

the same or different line cards. The following is a sample range configuration:

This applies to a system that has not been rebooted since doing the “no switchport” command.

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