HP 7000 dl Router manual Half-duplex

SROS Command Line Interface Reference Guide Ethernet Interface Configuration Command Set

half-duplex

Use the half-duplexcommand to configure the Ethernet interface for half-duplex operation. This setting allows the Ethernet interface to either send or receive at any given moment, but not simultaneously. Use the no form of this command to disable half-duplex operation.

Syntax Description

No subcommands.

Default Values

By default, all Ethernet interfaces are configured for half-duplex operation.

Command Modes

Ethernet Interface Configuration Modes

Functional Notes

Half-duplex Ethernet is the traditional form of Ethernet that employs the Carrier Sense Multiple Access/Collision Detect (CSMA/CD) protocol to allow two or more hosts to share a common transmission medium while providing mechanisms to avoid collisions. A host on a half-duplex link must “listen” on the link and only transmit when there is an idle period. Packets transmitted on the link are broadcast (so it will be “heard” by all hosts on the network). In the event of a collision (two hosts transmitting at once), a message is sent to inform all hosts of the collision and a backoff algorithm is implemented. The backoff algorithm requires the station to remain silent for a random period of time before attempting another transmission. This sequence is repeated until a successful data transmission occurs.

If the speed is manually set to 10 or 100, the duplex must be manually configured as

Notefull-duplexor half-duplex. See speed [10 100 auto] on page 484 for more information.

Usage Examples

The following example configures the Ethernet interface for half-duplexoperation:

(config)#interface ethernet 0/1

(config-eth 0/1)#half-duplex

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