Configuring Interface Speed And Duplex Mode; Speed And Duplex Configuration Guidelines - Cisco ME 3400 Software Configuration Manual

Chapter 9 Configuring Interfaces
Command
Step 3
no shutdown
Step 4
port-type {eni | nni | uni}
Step 5 end
Step 6 show interfaces interface-id
Step 7 copy running-config startup-config
Entering the no port-type or default port-type interface configuration command returns the port to the
default state: UNI for Fast Ethernet ports and NNI for Gigabit Ethernet ports.
This example shows how to change a port from a UNI to an NNI and save it to the running configuration.
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# interface fastethernet0/1
Switch(config-if)# port-type nni
Switch(config-if)# no shutdown
5d20h: %SYS-5-CONFIG_I: Configured from console by console
Switch(config-if)# end
Switch# copy running-config startup-config

Configuring Interface Speed and Duplex Mode

Ethernet interfaces on the switch operate at 10, 100, or 1000 Mbps and in either full- or half-duplex
mode. In full-duplex mode, two stations can send and receive traffic at the same time. Normally,
10-Mbps ports operate in half-duplex mode, which means that stations can either receive or send traffic.
Switch models include combinations of Fast Ethernet (10/100-Mbps) ports, Gigabit Ethernet
(10/100/1000-Mbps) ports, and small form-factor pluggable (SFP) module slots supporting SFP
modules.
These sections describe how to configure the interface speed and duplex mode:
•
•

Speed and Duplex Configuration Guidelines

When configuring an interface speed and duplex mode, note these guidelines:
•
•
OL-9639-07
Speed and Duplex Configuration Guidelines, page 9-15
Setting the Interface Speed and Duplex Parameters, page 9-16
You can configure interface speed on Fast Ethernet (10/100-Mbps) and Gigabit Ethernet
(10/100/1000-Mbps) ports. You can configure Fast Ethernet ports to full-duplex, half-duplex, or to
autonegotiate mode. You can configure Gigabit Ethernet ports to full-duplex mode or to
autonegotiate. You also can configure Gigabit Ethernet ports to half-duplex mode if the speed is 10
or 100 Mbps. Half-duplex mode is not supported on Gigabit Ethernet ports operating at 1000 Mbps.
With the exception of when 1000BASE-T SFP modules are installed in the SFP module slots, you
cannot configure speed on SFP module ports, but you can configure speed to not negotiate
(nonegotiate) if connected to a device that does not support autonegotiation.
However, when a 1000BASE-T SFP module is in the SFP module slot, you can configure speed as
10, 100, or 1000 Mbps, or auto, but not as nonegotiate.
On a 100BASE-FX SFP module, you cannot configure the speed as nonegotiate.
Purpose
Enable the port, if necessary. By default, UNIs and ENIs are
disabled, and NNIs are enabled.
Change a port to an ENI, NNI, or UNI.
Return to privileged EXEC mode.
Verify the interface IEEE 802.3x flow control settings.
(Optional) Save your entries in the configuration file.
End with CNTL/Z.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Configuring Ethernet Interfaces
9-15