7-11
Cisco Systems IntelligentGigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide
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Chapter7 Configuring Interface Cha racteristics
Configuring Ethernet Interfaces
You can configure interface speed on the Gigabit Ethernet (10/100/1000 Mbps). You cannot configure
speed on the fiber-optic SFP-module interfaces.
These sections describe how to configure the interface speed and duplex mode:
•Configuration Guidelines, page 7-11
•Setting the Interface Speed and Duplex Parameters, page 7-11
•Adding a Description for an Interface, page 7-12
Configuration Guidelines
When configuring an interface speed and duplex mode, note these guidelines:
•Ethernet ports set to 1000 Mbps should always be set to full du plex.
•A Gigabit Ethernet port that does not match the settings of an attached device can lose connectivity
and does not generate statistics.
•If both ends of the line support autonegotiation, we highly recommend the default setting of auto.
•When connecting an interface to a 100BASE-T device that does not autonegotiate, set the speed to
a nonautonegotiation value (for example, nonegotiate), and set the duplex m ode to full or half to
match the device. The speed value and duplex mode must be explicitly set.
•When connecting an interface to a Gigabit Ethernet device that does not autonegotiate, disable
autonegotiation on the switch, and set the duplex parameter to be compatible with the remote device.
•Fiber-optic SFP-module ports operate only at 1000 Mbps in full-duplex mode.
Caution Changing the interface speed and duplex mode configuration might shut down and re-enable the
interface during the reconfiguration.
Setting the Interface Speed and Duplex Parameters
Beginning in priv ileged EXEC mod e, follow these steps to set the speed and duplex mode for a physical
interface on a switch:
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Enter interface configuration mode and the physical interface
identification.
Step3 speed {10 | 100 | 1000 | auto [10 | 100 |
1000] | nonegotiate}
Enter the appropriate speed parameter for the interface, or enter auto
or nonegotiate.
Note This option is available only on the external ports. It is not
available on the internal switch ports.
Step4 duplex {auto | full | half} Enter the duplex parameter for the interface. For configuration
guidelines, see the “Configuration Guidelines” section on page 7-11.
Note This option is available only on the external ports. It is not
available on the internal switch ports.
Step5 end Return to privileged EXEC mode.