Configuring Interface Speed And Duplex Mode; Speed And Duplex Configuration Guidelines - Cisco Catalyst 3750-X Software Configuration Manual
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Configuring Ethernet Interfaces
Table 13-3
Default Layer 2 Ethernet Interface Configuration (continued)
Feature
Auto-MDIX
Power over Ethernet (PoE)
Configuring Interface Speed and Duplex Mode
Ethernet interfaces on the switch operate at 10, 100, 1000, or 10,000 Mb/s and in either full- or
half-duplex mode. In full-duplex mode, two stations can send and receive traffic at the same time.
Normally, 10-Mb/s ports operate in half-duplex mode, which means that stations can either receive or
send traffic.
Switch models include Gigabit Ethernet (10/100/1000-Mb/s) ports, 10-Gigabit Ethernet ports, and small
form-factor pluggable (SFP) module slots supporting SFP modules.
These sections describe how to configure the interface speed and duplex mode:
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•
Speed and Duplex Configuration Guidelines
When configuring an interface speed and duplex mode, note these guidelines:
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•
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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
13-28
Default Setting
Enabled.
Note
Enabled (auto).
Speed and Duplex Configuration Guidelines, page 13-28
Setting the Interface Speed and Duplex Parameters, page 13-29
The 10-Gigabit Ethernet ports do not support the speed and duplex features. These ports operate
only at 10,000 Mb/s and in full-duplex mode.
Gigabit Ethernet (10/100/1000-Mb/s) ports support all speed options and all duplex options (auto,
half, and full). However, Gigabit Ethernet ports operating at 1000 Mb/s do not support half-duplex
mode.
For SFP module ports, the speed and duplex CLI options change depending on the SFP module type:
The 1000BASE-x (where -x is -BX, -CWDM, -LX, -SX, and -ZX) SFP module ports support
–
the nonegotiate keyword in the speed interface configuration command. Duplex options are not
supported.
The 1000BASE-T SFP module ports support the same speed and duplex options as the
–
10/100/1000-Mb/s ports.
For information about which SFP modules are supported on your switch, see the product release
notes.
If both ends of the line support autonegotiation, we highly recommend the default setting of auto
negotiation.
If one interface supports autonegotiation and the other end does not, configure duplex and speed on
both interfaces; do not use the auto setting on the supported side.
When STP is enabled and a port is reconfigured, the switch can take up to 30 seconds to check for
loops. The port LED is amber while STP reconfigures.
The switch might not support a pre-standard powered device—such as
Cisco IP phones and access points that do not fully support IEEE
802.3af—if that powered device is connected to the switch through a
crossover cable. This is regardless of whether auto-MIDX is enabled on
the switch port.
Chapter 13
Configuring Interface Characteristics
OL-21521-01
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