Cisco Catalyst 2928 Software Configuration Manual page 254

Configuring Ethernet Interfaces
Command
Step 3
media-type {auto-select | rj45 | sfp} Select the interface and type of a dual-purpose uplink port. The keywords
Step 4 end
Step 5 show interfaces interface-id
transceiver properties
Step 6 copy running-config startup-config
To return to the default setting, use the no media-type interface configuration command.
When you change the interface type, the speed and duplex configurations are removed. The switch
configures both types to autonegotiate speed and duplex (the default). If you configure auto-select, you
cannot configure the speed and duplex interface configuration commands.
When the switch powers on or when you enable a dual-purpose uplink port through the shutdown and
the no shutdown interface configuration commands, the switch gives preference to the SFP module
interface. In all other situations, the switch selects the active link based on which type first links up.
The Catalyst 2928 switch operates with 100BASE-x (where -x is -BX, -FX-FE, -LX) SFP modules as
follows:
•
•
•
The switch does not have this behavior with 100BASE-FX-GE SFP modules.
Catalyst 2928 Switch Software Configuration Guide
12-16
Purpose
have these meanings:
•
•
•
For information about setting the speed and duplex, see the
Duplex Configuration Guidelines" section on page
Return to privileged EXEC mode.
Verify your setting.
(Optional) Save your entries in the configuration file.
When the 100BASE -x SFP module is inserted into the module slot and there is no link on the RJ-45
side, the switch disables the RJ-45 interface and selects the SFP module interface. This is the
behavior even if there is no cable connected and if there is no link on the SFP module side.
When the 100BASE-x SFP module is inserted and there is a link on the RJ-45 side, the switch
continues with that link. If the link goes down, the switch disables the RJ-45 side and selects the
SFP module interface.
When the 100BASE-x SFP module is removed, the switch again dynamically selects the type
(auto-select) and re-enables the RJ-45 side.
auto-select—The switch dynamically selects the type. When link up 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).
Depending on the type of installed SFP module, the switch might not
be able to dynamically select it. For more information, see the
information that follows this procedure.
rj45—The switch disables the SFP module interface. If you connect a
cable to this 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
this port, it cannot attain a link even if the SFP module 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.
Chapter 12 Configuring Interface Characteristics
"Speed and
12-17.
OL-23389-01