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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
speed
speed
Use the speed interface configuration command to specify the speed of a port. Use the no form of this
command to return to the default setting.
speed {10 | 100 | 1000 | auto [10 | 100 | 1000] | nonegotiate}
no speed
Note You cannot configure speed or duplex mode on Gigabit Interface Converter (GBIC) ports, but for certain
types of GBICs, you can configure speed to not negotiate (nonegotiate) if they are connected to a device
that does not support autonegotiation.
Syntax Description
Defaults For Fast Ethernet and 10/100/1000 ports, the default is auto.
For 100BASE-FX ports, the default is 100 Mbps.
For GBIC-module ports, the default is 1000 Mbps.
For small form-factor pluggable (SFP)-module ports, the default is auto.
Command Modes Interface configuration
Command History
Usage Guidelines The applicability of this command depends on the switch on which you enter it.
SFP ports only operate at 1000 Mbps, and those with a 1000 BASE-T module installed can only be
configured for full-duplex mode.
10 Port runs at 10 Mbps.
100 Port runs at 100 Mbps.
1000 Port runs at 1000 Mbps (only valid for Gigabit Ethernet ports).
auto Port automatically detects whether it should run at 10 or 100 Mbps on Fast
Ethernet ports or at 10, 100, or 1000 Mbps on 10/100/1000 and SFP-module ports.
If you use the 10, 100, or 1000 keywords with the auto keyword, the port only
autonegotiates at the specified speeds.
nonegotiate Autonegotiation is disabled, and the port runs at 1000 Mbps. This option is valid
and visible only on 1000BASE-X, -LX, and -ZX GBIC ports. Gigastack GBICs
and 1000BASE-T GBICs do not suport disabling of autonegotiation.
Release Modification
12.0(5.2)WC(1) This command was introduced.
12.1(11)EA1 The nonegotiate keyword was added.
12.1(22)EA1 Support for the 10, 100, and 1000 keywords with the auto keyword was
added.
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