Filter
Top Products
10-16
Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 10 Configuring Interface Characteristics
Configuring Ethernet Interfaces
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 external Gigabit Ethernet (10/100/1000-Mb/s) ports, 10-Gigabit Ethernet ports,
and internal 1000 Mb/s ports.
These sections describe how to configure the interface speed and duplex mode:
• Speed and Duplex Configuration Guidelines, page 10-16
• Setting the Interface Speed and Duplex Parameters, page 10-17
Speed and Duplex Configuration Guidelines
When configuring an interface speed and duplex mode, note these guidelines:
• 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.
• The external 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 internal Ethernet management ports do not support the speed and duplex features. These ports
operate only at 1000 Mb/s and in full-duplex mode.
• 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.
Caution Changing the interface speed and duplex mode configuration might shut down and re-enable the
interface during the reconfiguration.
Port Fast Disabled. See the “Default Optional Spanning-Tree
Configuration” section on page 19-12.
Auto-MDIX
Note Enabled.
Table 10-1 Default Layer 2 Ethernet Interface Configuration (continued)
Feature Default Setting