Cisco 4500M Command Reference Manual page 484

speed
Table2-22 Supported speed Command Options
Interface Type
10/100-Mbps
module
100-Mbps fiber
modules
Gigabit Ethernet
Interface
10/100/1000
1000
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 param eter.
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
modes. The specified duplex command configured with the specified speed command produces the
resulting system action.
Table2-23 System Action Using duplex and speed Commands
duplex Command
duplex half or duplex full speed auto
duplex half
duplex full
duplex half
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Supported Syntax
speed [10 | 100 |
auto]
Not applicable.
speed nonegotiate
speed [10 | 100 |
1000 | auto ]
Not applicable.
describes the system's performance for different combinations of the duplex and speed
speed Command
speed 10
speed 10
speed 100
Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Default Setting Guidelines
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.
Not applicable. Not applicable.
Nonegotiate is This is only applicable to Gigabit
enabled. Ethernet ports.
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.
Not applicable. The speed is always 1000.
The duplex is half.
Resulting System Action
Autonegotiates both speed and duplex
modes
Forces 10 Mbps and half duplex
Forces 10 Mbps and full duplex
Forces 100 Mbps and half duplex
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