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Chapter 9
Configuring Interface Characteristics
Configuring Interface Speed and Duplex Mode
Ethernet interfaces on the switch operate at 10, 100, or 1000 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 and small form-factor pluggable
(SFP) module slots supporting SFP modules.
Gigabit interfaces 0/1 to 0/16 are internal downlink ports to the blade server. The speed for these
interfaces are set at 1000 Mbps, and the duplex is set to full; these settings cannot be changed.
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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Caution
Changing the interface speed and duplex mode configuration might shut down and re-enable the
interface during the reconfiguration.
OL-8915-03
Speed and Duplex Configuration Guidelines, page 9-15
Setting the Interface Speed and Duplex Parameters, page 9-16
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.
The 1000BASE-SX SFP module ports support the nonegotiate keyword in the speed interface
configuration command. Duplex options are not supported.
You cannot configure duplex mode on SFP module ports; they operate in full-duplex mode except
in these situations:
You can configure Cisco 1000BASE-T SFP modules for auto, full, or half-duplex mode.
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Cisco 1000BASE-SX SFP modules can operate only in full-duplex mode.
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If you are connected to a device that does not support autonegotiation, you can configure speed on
copper SFP module ports; however, you can only configure fiber SFP module ports to not negotiate
(nonegotiate).
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.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring Ethernet Interfaces
9-15
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