Setting The Interface Speed And Duplex Parameters - Cisco ME 3400 Software Configuration Manual

Configuring Ethernet Interfaces
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Changing the interface speed and duplex mode configuration might shut down and re-enable the
Caution
interface during the reconfiguration.

Setting the Interface Speed and Duplex Parameters

Beginning in privileged EXEC mode, follow these steps to set the speed and duplex mode for a physical
interface.
Note On dual-purpose ports, changing the interface type by entering the media-type interface configuration
command removes the speed and duplex configurations. See the
section on page 9-18
Command
Step 1 configure terminal
Step 2 interface interface-id
Step 3 no shutdown
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
9-16
You cannot configure duplex mode on SFP module ports; they operate in full-duplex mode except
in these situations:
– When a Cisco1000BASE-T SFP module is in the SFP module slot, you can configure duplex
mode to auto or full. Half-duplex mode is supported with the auto setting.
– When a Cisco100BASE-FX SFP module is in the SFP module slot, you can configure duplex
mode to half or full. Although the auto keyword is available, it puts the interface in half-duplex
mode (the default for this SFP module) because the 100BASE-FX SFP module does not support
autonegotiation.
If both ends of the line support autonegotiation, we highly recommend the default setting of auto
negotiation.
If one interface supports autonegotiation and the other end does not, configure duplex and speed on
both interfaces; do not use the auto setting on the supported side.
When STP is enabled and a port is reconfigured, the switch can take up to 30 seconds to check for
loops. The port LED is amber while STP reconfigures. On the Cisco ME switch, STP is supported
on NNIs by default and can be enabled on ENIs. UNIs do not support STP.
for information about speed and duplex setting on these ports.
Purpose
Enter global configuration mode.
Specify the physical interface to be configured, and enter interface
configuration mode.
Enable the port, if necessary. By default, UNIs and ENIs are disabled,
and NNIs are enabled.
Chapter 9 Configuring Interfaces
"Configuring a Dual-Purpose Port"
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