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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 9 Configuring Interfaces
Configuring Ethernet Interfaces
To return to the default setting, use the no media-type interface configuration command.
Changing the interface type removes the speed and duplex configurations. The switch configures both
media types to autonegotiate speed and duplex (the default). If you configure auto-select, you cannot
configure the speed and duplex interface configuration commands.
When you configure sfp or rj45 media type, the non-configured type is disabled, even if there is a
connector installed in that interface and no connector in the configured one.
When the media type is auto-select, the switch uses these criteria to select the type:
Note An SFP is not installed until it has a fiber-optic or copper cable plugged in.
• If only one connector is installed, that interface is active and remains active until the media is
removed or the switch is reloaded.
• If you install both types of media in an enabled dual-purpose port, the switch selects the active link
based on which type is installed first.
• If both media are installed in the dual-purpose port, and the switch is reloaded or the port is disabled
and then reenabled through the shutdown and the no shutdown interface configuration commands,
the switch gives preference to the SFP module interface.
See the media-type interface configuration command in the command reference for more information.
Step 3
media-type {auto-select | rj45 | sfp} Select the active interface and media type of a dual-purpose port. The
keywords have these meanings:
• auto-select—The switch dynamically selects the media type. This is the
default. When a linkup is achieved, the switch disables the other type
until the active link goes down. When the active link goes down, the
switch enables both types until one of them links up. In auto-select
mode, the switch configures both types with autonegotiation of speed
and duplex (the default).
• rj45—The switch disables the SFP module interface. If you connect a
cable to the SFP port, it cannot attain a link even if the RJ-45 side is
down or is not connected. In this mode, the dual-purpose port behaves
like a 10/100/1000BASE-TX interface. You can configure the speed and
duplex settings consistent with this interface type.
• sfp—The switch disables the RJ-45 interface. If you connect a cable to
the RJ-45 port, it cannot attain a link even if the SFP side is down or if
the SFP module is not present. Based on the type of installed SFP
module, you can configure the speed and duplex settings consistent with
this interface type.
Step 4
end Return to privileged EXEC mode.
Step 5
show interfaces interface-id
transceiver properties
Verify your setting.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
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