Speed - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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Also See for Catalyst 3550:
- Command reference manual (794 pages) ,
- Installation manual (154 pages) ,
- Hardware installation manual (106 pages)
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Chapter 2 Cisco IOS Commands
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.
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
The default is auto.
Command Modes
Interface configuration
Command History
Release
12.1(4)EA1
12.1(6)EA1
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.
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.
78-11195-09
speed {10 | 100 | 1000 | auto | 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 Gigabit Ethernet
(Tx) ports.
Port automatically detects the speed it should run at based on the port at the other
end of the link.
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.
Modification
This command was first introduced.
The 1000 and nonegotiate keywords were added.
Catalyst 3550 Multilayer Switch Command Reference
speed
2-449
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