Cisco Catalyst 3550

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Catalyst 3550 Multilayer Switch Command Reference
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Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
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.
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 The default is auto.
Command Modes Interface configuration
Command History
Usage Guidelines You can configure Fast Ethernet port speed to either 10 or 100 Mbps. You can configure Gigabit
Ethernet port speed to 10, 100, or 1000 Mbps. You cannot configure speed on Gigabit Interface
Converter (GBIC) interfaces, but for 1000BASE-SX, -LX, or -ZX GBICs, you can configure speed to
not negotiate (nonegotiate) if connected to a device that does not support autonegotiation.
10 Port runs at 10 Mbps.
100 Port runs at 100 Mbps.
1000 Port runs at 1000 Mbps. This option is valid and visible only on Gigabit Ethernet
(Tx) ports.
auto 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.
nonegotiate Autonegotiation is disabled and the port runs at 1000 Mbps. This option is valid and
visible only on 1000BASE-SX, -LX, and -ZX GBIC ports. Gigastack GBICs and
1000BASE-T GBICs do not support disabling of autonegotiation.
Release Modification
12.1(4)EA1 This command was introduced.
12.1(6)EA1 The 1000 and nonegotiate keywords were added.
12.1(22)EA1 Support for the 10, 100, and 1000 keywords with the auto keyword was
added.