Cisco Gigabit Ethernet Switch Module for HP p-Class BladeSystem Software Configuration Guide

7-10
Cisco Gigabit Ethernet Switch Module for HP p-Class BladeSystem Software Configuration Guide
380261-003
Chapter 7 Configuring Interface Characteristics
Configuring Ethernet Interfaces
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.
These sections describe how to configure the interface speed and duplex mode:
• Speed and Duplex Configuration Guidelines, page 7-10
• Setting the Interface Speed and Duplex Parameters, page 7-11
Speed and Duplex Configuration Guidelines
When configuring an interface speed and duplex mode, note these guidelines:
• 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-Mbps ports.
– The 100BASE-x (where -x is -BX, -CWDM, -LX, -SX, and -ZX) SFP module ports support only
100 Mbps. These modules support full- and half- duplex options but do not support
autonegotiation.
For information about which SFP modules are supported on your switch, see the product
release notes.
• 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.
Port Fast Disabled. See the “Default Optional Spanning-Tree
Configuration” section on page 14-9.
Auto-MDIX Enabled.
Note 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.
Table 7-1 Default Layer 2 Ethernet Interface Configuration (continued)
Feature Default Setting