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Cisco ASR 901 Aggregation Services Router Command Reference Guide
OL-26031-07
Chapter 1 CLI Command Reference
speed
Speed and Duplex Combinations
Table 1-14
describes the interface behavior for various combinations of the
duplex
and
speed
command
settings. The specified
duplex
command configured with the specified
speed
command produces the
resulting system action.
If you decide to configure the interface speed and duplex commands manually, and enter a value (for
example, speed 10 or speed 100 ), ensure that you configure the connecting interface speed command to
a matching speed.
You cannot set the duplex mode to
half
when the port speed is set at 1000 and similarly, you cannot set
the port speed to
1000
when the mode is set to half duplex.
Caution
Changing the interface speed and duplex mode might shut down and reenable the interface during the
reconfiguration.
Examples
The following example specifies advertisement of 10 Mbps operation only, and either full-duplex or
half-duplex capability during autonegotiation:
Router#
configure terminal
Router(config)#
interface gigabitethernet 0/1
Router(config-if)#
speed 10
Router(config-if)#
duplex full
With this configuration, the interface advertises the following capabilities during autonegotiation:
•
10 Mbps and half duplex
•
10 Mbps and full duplex
Related Commands
Table 1-14
Relationship Between duplex and speed Commands
duplex Command
speed Command
Resulting System Action
duplex half
speed 10
Forces 10-Mbps and half-duplex operation, and
disables autonegotiation on the interface.
duplex full
speed 10
Forces 10-Mbps and full-duplex operation, and
disables autonegotiation on the interface.
duplex half
speed 100
Forces 100-Mbps and half-duplex operation, and
disables autonegotiation on the interface.
duplex full
speed 100
Forces 100-Mbps and full-duplex operation, and
disables autonegotiation on the interface.
duplex full
speed 1000
Forces 1000-Mbps and full-duplex operation,
and disables autonegotiation on the interface
(Gigabit Ethernet only).
Command
Description
duplex
Configures the duplex operation on an interface.
interface gigabitethernet
Selects a particular Gigabit Ethernet interface for configuration.