9-7
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 9 Configuring Interfaces
Configuring Optional Interface Features
• Configuring IEEE 802.3x Flow Control, page 9-13
• Configuring the Port Debounce Timer, page 9-14
• Adding a Description for an Interface, page 9-16
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, page 9-7
• Configuring the Ethernet Interface Speed, page 9-7
• Setting the Interface Duplex Mode, page 9-8
• Configuring Link Negotiation on Gigabit Ethernet Ports, page 9-8
• Displaying the Speed and Duplex Mode Configuration, page 9-9
Speed and Duplex Mode Configuration Guidelines
You usually configure Ethernet port speed and duplex mode parameters to auto and allow the Cisco 7600
series router 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:
• If you set the Ethernet port speed to auto, the router automatically sets the duplex mode to auto.
• If you enter the no speed command, the router 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 router prompts
you to also configure the duplex mode on the port.
Note Cisco 7600 series routers cannot automatically negotiate Ethernet port speed and duplex mode if the
connecting port is configured to a value other than auto.
Caution Changing the Ethernet port speed and duplex mode configuration might shut down and reenable the
interface during the reconfiguration.
Configuring the Ethernet Interface Speed
Note If you configure the Ethernet port speed to auto on a 10/100-Mbps or 10/100/1000-Mbps Ethernet port,
both speed and duplex are autonegotiated.
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