Cisco 4500M

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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
speed
If you configure the interface speed and duplex commands manually and enter a value other than speed
auto (for example, 10 or 100 Mbps), be sure that you configure the connecting interface speed command
to a matching speed but do not use the auto parameter.
When manually configuring the interface speed to either 10 or 100 Mbps, the switch prompts you to also
configure duplex mode on the interface.
Note Catalyst 4006 switches cannot automatically negotiate interface speed and duplex mode if either
connecting interface is configured to a value other than auto.
Caution Changing the interface speed and duplex mode configuration might shut down and reenable the interface
during the reconfiguration.
Table2-23 describes the system’s performance for different combinations of the duplex and speed
modes. The specified duplex command configured with the specified speed command produces the
resulting system action.
Table2-22 Supported speed Command Options
Interface Type Supported Syntax Default Setting Guidelines
10/100-Mbps
module
speed [10 | 100 |
auto]
auto If the speed is set to auto, you will not
be able to set duplex.
If the speed is set to 10 or 100 and
you do not configure the duplex
setting, the duplex is set to half.
100-Mbps fiber
modules
Not applicable. Not applicable. Not applicable.
Gigabit Ethernet
Interface
speed nonegotiate Nonegotiate is
enabled.
This is only applicable to Gigabit
Ethernet ports.
10/100/1000 speed [10 | 100 |
1000 | auto]
auto If the speed is set to auto or 1000, you
will not be able to set duplex.
If the speed is set to 10 or 100 and
you do not configure the duplex
setting, the duplex is set to half.
1000 Not applicable. Not applicable. The speed is always 1000.
The duplex is half.
Table2-23 System Action Using duplex and speed Commands
duplex Command speed Command Resulting System Action
duplex half or duplex full speed auto Autonegotiates both speed and duplex
modes
duplex half speed 10 Forces 10 Mbps and half duplex
duplex full speed 10 Forces 10 Mbps and full duplex
duplex half speed 100 Forces 100 Mbps and half duplex