Cisco Catalyst 2900 Series XL Especificaciones descargar pdf (Pagina 176)

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

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Chapter 7 Configuring the Switch Ports

Changing the Port Speed and Duplex Mode

Caution If you reconfigure the port through which you are managing the switch, a Spanning Tree Protocol

(STP) reconfiguration could cause a temporary loss of connectivity.

Follow these guidelines when configuring the duplex and speed settings:

• Gigabit Ethernet ports are always set to 1000 Mbps but can negotiate full or half duplex with the

attached device.

• Gigabit Ethernet ports that do not match the settings of an attached device lose connectivity and do

not generate statistics.

• Asynchronous Transfer Mode (ATM) ports are always set to full duplex and do not autonegotiate

duplex or speed settings.

• GigaStack-to-GigaStack stack connections operate in half-duplex mode, and

GigaStack-to-GigaStack point-to-point connections operate in full-duplex mode.

• If STP is enabled, the switch can take up to 30 seconds to check for loops when a port is

reconfigured. The port LED is amber while STP reconfigures.

Connecting to Devices That Do Not Autonegotiate

To connect to a remote 100BASE-T device that does not autonegotiate, set the duplex setting to Full or

Half, and set the speed setting to Auto. Autonegotiation for the speed setting selects the correct speed

even if the attached device does not autonegotiate, but the duplex setting must be explicitly set.

To connect to a remote Gigabit Ethernet device that does not autonegotiate, disable autonegotiation on

the local device, and set the duplex and flow control parameters to be compatible with the other device.

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