Installation guide

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards

How to Configure EtherSwitch HWICs

Cisco IOS Release 12.3(8)T4

OL-6454-01

Configuring Layer 2 Optional Interface Features

• Interface Speed and Duplex Configuration Guidelines, page 13

• Configuring the Interface Speed, page 13

• Configuring the Interface Duplex Mode, page 14

• Verifying Interface Speed and Duplex Mode Configuration, page 14

• Configuring a Description for an Interface, page 15

• Configuring a Fast Ethernet Interface as a Layer 2 Trunk, page 15

• Configuring a Fast Ethernet Interface as Layer 2 Access, page 16

Interface Speed and Duplex Configuration Guidelines

When configuring an interface speed and duplex mode, note these guidelines:

• If both ends of the line support autonegotiation, Cisco highly recommends the default auto

negotiation settings.

• If one interface supports auto negotiation and the other end does not, configure duplex and speed on

both interfaces; do not use the auto setting on the supported side.

• Both ends of the line need to be configured to the same setting. For example, both hard-set or both

auto-negotiate. Mismatched settings are not supported.

Caution Changing the interface speed and duplex mode configuration might shut down and reenable the interface

during the reconfiguration.

Configuring the Interface Speed

Beginning in global configuration mode, follow these steps to set the interface speed.

SUMMARY STEPS

1. interface fastethernet

interface-id

2. speed [10 | 100 | auto]

DETAILED STEPS

Note If you set the interface speed to auto on a 10/100-Mbps Ethernet interface, both speed and duplex are

auto negotiated.

Command Purpose

Step 1

Router(config)#interface fastethernet

interface-id

Selects the interface to be configured.

Step 2

Router(config-if)#speed [10 | 100 | auto]

Sets the interface speed of the interface.