Configuring Ethernet Interface Speed And Duplex Mode - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Chapter 7 Configuring Interfaces

Configuring Ethernet Interface Speed and Duplex Mode

These sections describe how to configure Ethernet port speed and duplex mode:
•
•
•
•
•
Speed and Duplex Mode Configuration Guidelines
You usually configure Ethernet port speed and duplex mode parameters to auto and allow the
Catalyst 6500 series switch to negotiate the speed and duplex mode between ports. If you decide to
configure the port speed and duplex modes manually, consider the following information:
•
•
•
•
Catalyst 6500 series switches cannot automatically negotiate Ethernet port speed and duplex mode if the
Note
connecting port is configured to a value other than auto.
Changing the Ethernet port speed and duplex mode configuration might shut down and reenable the
Caution
interface during the reconfiguration.
Configuring the Ethernet Interface Speed
If you configure the Ethernet port speed to auto on a 10/100-Mbps or 10/100/1000-Mbps Ethernet port,
Note
both speed and duplex are autonegotiated.
To configure the port speed for a 10/100 or a 10/100/1000-Mbps Ethernet port, perform this task:
Command
Step 1
Router(config)# interface fastethernet slot/port
Step 2
Router(config-if)# speed {10 | 100 | 1000 |
{auto [10 100 [1000]]}}
Router(config-if)# no speed
OL-11439-03
Speed and Duplex Mode Configuration Guidelines, page 7-7
Configuring the Ethernet Interface Speed, page 7-7
Setting the Interface Duplex Mode, page 7-8
Configuring Link Negotiation on Gigabit Ethernet Ports, page 7-8
Displaying the Speed and Duplex Mode Configuration, page 7-9
If you set the Ethernet port speed to auto, the switch automatically sets the duplex mode to auto.
If you enter the no speed command, the switch automatically configures both speed and duplex to
auto.
If you configure an Ethernet port speed to a value other than auto (for example, 10, 100, or
1000 Mbps), configure the connecting port to match. Do not configure the connecting port to
negotiate the speed.
If you manually configure the Ethernet port speed to either 10 Mbps or 100 Mbps, the switch
prompts you to also configure the duplex mode on the port.
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
Configuring Optional Interface Features
Purpose
Selects the Ethernet port to be configured.
Configures the speed of the Ethernet interface.
Reverts to the default configuration (speed auto).
7-7