Cisco Catalyst 4500 Series Command Reference Manual page 1076

speed
Usage Guidelines Table 2-44
Table 2-44
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), make 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 4506 switches cannot automatically negotiate the interface speed and the duplex mode if either
connecting interface is configured to a value other than auto.
Changing the interface speed and the duplex mode configuration might shut down and reenable the
Caution
interface during the reconfiguration.
Table 2-45
modes. The specified duplex command that is configured with the specified speed command produces
the resulting system action.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
2-1018
lists the supported command options by interface.
Supported speed Command Options
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
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Default Setting Guidelines
auto 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 10 or 100 and
you do not configure the duplex
setting, the duplex is set to half.
If the speed is set to 1000 or auto with
any subset containing 1000
(e.g. speed auto 10 1000 or
speed auto on a 10/100/1000 port),
you will not able to set half duplex.
Not applicable. The speed is always 1000.
The duplex is half.
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