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13.7 Configuration of Gigabitethernet (RJ45)
13.7.1 Configuring ports
(1) Setting the transmission speed and duplex mode
You can set the transmission speed and duplex mode used for communication between the
Switch and a remote device. By default, the transmission speed and duplex mode are
determined automatically by auto-negotiation. To change to the transmission speed and
duplex mode that corresponds to the remote device, first specify
and then change the setting. For details about media types, see 13.7.5 Setting the media
type [AX1250S] [AX1240S].
(a) Connecting to a remote device that does not support auto-negotiation
Points to note
Depending on the remote device, 10BASE-T or 100BASE-TX connection sometimes
cannot be established by auto-negotiation. If the connection cannot be established,
you need to specify the transmission speed and duplex mode according to the
remote device, and establish a connection with fixed settings.
Command examples
1.
(config)# interface gigabitethernet 0/25
(config-if)# shutdown
(config-if)# media-type rj45
(config-if)# speed 100
(config-if)# duplex half
This example configures the switch so that the connection with the remote device is
a 100BASE-TX, half-duplex connection.
2.
(config-if)# no shutdown
(config-if)# exit
(b) Using a specific communication speed even when auto-negotiation is used
Points to note
For the Switch, you can set a specific transmission speed even when
auto-negotiation is used for a connection. Note that if auto-negotiation is used and a
specific transmission speed is also specified, even if a connection with
auto-negotiation is successful, the status of the line is not link-up unless the set
transmission speed is assured. This eliminates the risk of the line being connected at
an unexpected transmission speed.
Command examples
1.
(config)# interface gigabitethernet 0/25
(config-if)# shutdown
(config-if)# media-type rj45
(config-if)# speed auto 1000
This sequence ensures that only a 1000BASE-T connection is used when the switch
connects to the remote device via auto-negotiation.
13 Ethernet
rj45
for the media type,
183
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