Speed - Cisco Catalyst 2950 Command Reference Manual

speed

speed
Use the speed interface configuration command to specify the speed of a port. Use the no form of this
command to return the port to its default value.
You cannot configure speed or duplex mode on Gigabit Interface Converter (GBIC) ports, but for certain
Note
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
10
100
1000
auto
nonegotiate
Defaults
For Fast Ethernet and 10/100/1000 ports, the default is auto.
For 100BASE-FX ports, the default is 100 Mbps.
For Gigabit Interface Converter (GBIC)-module ports, the default is 1000 Mbps.
Command Modes Interface configuration
Command History Release
12.0(5.2)WC(1)
12.1(11)EA1
Usage Guidelines
Fast Ethernet ports, except for 100BASE-FX ports, can be configured at 10 or 100 Mbps. The
10/100/1000 ports can be configured at 10, 100, or 1000 Mbps and operate only in the full-duplex mode.
You cannot configure the speed on GBIC interfaces, but you can configure the speed to not negotiate
(nonegotiate) for the 1000BASE-SX, -LX, or -ZX GBICs, if they are connected to devices that do not
support autonegotiation. GBIC-module ports support only 1000 Mbps. The speed values of 10 Mbps
and 100 Mbps are not supported.
Catalyst 2950 Desktop Switch Command Reference
2-286
speed {10 | 100 | 1000 | auto| nonegotiate}
no speed
Port runs at 10 Mbps.
Port runs at 100 Mbps.
Port runs at 1000 Mbps (only valid for Gigabit Ethernet ports).
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 ports.
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.
Modification
This command was first introduced.
The nonegotiate keyword was added.
Chapter 2 Cisco IOS Commands
78-11381-05