Speed - Cisco Catalyst 2960 Command Reference Manual

speed

speed
Use the speed interface configuration command to specify the speed of a 10/100 Mbps or
10/100/1000 Mbps port. Use the no or default form of this command to return the port to its default
value.
Syntax Description
10
100
1000
auto
nonegotiate
Defaults
The default is auto.
Command Modes
Interface configuration
Command History Release
12.2(25)FX
Usage Guidelines If an SFP module port is connected to a device that does not support autonegotiation, you can configure
the speed to not negotiate (nonegotiate).
If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed
setting and then forces the speed setting to the negotiated value. The duplex setting remains as
configured on each end of the link, which could result in a duplex setting mismatch.
If both ends of the line support autonegotiation, we highly recommend the default autonegotiation
settings. If one interface supports autonegotiation and the other end does not, do use the auto setting on
the supported side, but set the duplex and speed on the other side.
Changing the interface speed and duplex mode configuration might shut down and re-enable the
Caution
interface during the reconfiguration.
For guidelines on setting the switch speed and duplex parameters, see the "Configuring Interface
Characteristics" chapter in the software configuration guide for this release.
Catalyst 2960 Switch Command Reference
2-460
speed {10 | 100 | 1000 | auto [10 | 100 | 1000] | nonegotiate}
no speed
Port runs at 10 Mbps.
Port runs at 100 Mbps.
Port runs at 1000 Mbps. This option is valid and visible only on 10/100/1000
Mbps-ports.
Port automatically detects the speed it should run at based on the port at the other
end of the link. If you use the 10, 100, or 1000 keywords with the auto keyword, the
port only autonegotiates at the specified speeds.
Autonegotiation is disabled, and the port runs at 1000 Mbps.
Modification
This command was introduced.
Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
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