Configuring Interface Speed And Duplex Mode; Speed And Duplex Configuration Guidelines; Setting The Type Of A Dual-Purpose Uplink Port - Cisco 3020 - Catalyst Blade Switch Configuration Manual

Chapter 8 Configuring Interface Characteristics
Table 8-1
Feature
Port security
Port Fast
Auto-MDIX

Configuring Interface Speed and Duplex Mode

Ethernet interfaces on the switch operate at 10, 100, or 1000 Mbps 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-Mbps ports operate in half-duplex mode, which means that stations can either receive or send traffic.
Switch models include Gigabit Ethernet (10/100/1000-Mbps) 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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•
•
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OL-8915-01
Default Layer 2 Ethernet Interface Configuration (continued)
Speed and Duplex Configuration Guidelines, page 8-11
Setting the Type of a Dual-Purpose Uplink Port, page 8-12
Setting the Interface Speed and Duplex Parameters, page 8-14
Gigabit Ethernet (10/100/1000-Mbps) ports support all speed options and all duplex options (auto,
half, and full). However, Gigabit Ethernet ports operating at 1000 Mbps 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.
–
Cisco 1000BASE-SX SFP modules can operate only in full-duplex mode.
–
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).
Default Setting
Disabled. See the "Default Port Security Configuration" section
on page 19-10.
Disabled. Enabled by default on Gigabit Ethernet interfaces 0/1 to
0/16. See the "Default Optional Spanning-Tree Configuration"
section on page 15-9.
Enabled.
The switch might not support a pre-standard powered
Note
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.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring Ethernet Interfaces
8-11