Auto-Mdi/Mdix Support; Vlan-Aware Mac-Based Switching; Back Pressure Support; Auto Negotiation - Dell Networking N4000 Series Configuration Manual

Stackable layer 2 and 3 switches

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Auto-MDI/MDIX Support

Your switch supports auto-detection between crossed and straight-through

cables. Media-Dependent Interface (MDI) is the standard wiring for end

stations, and the standard wiring for hubs and switches is known as Media-

Dependent Interface with Crossover (MDIX). Auto-negotiation must be

enabled for MDIX to detect the wiring configuration.

Packets arriving from an unknown source address are sent to the CPU and

added to the Hardware Table. Future packets addressed to or from this

address are more efficiently forwarded.

On half-duplex links, a receiver may prevent buffer overflows by jamming the

link so that it is unavailable for additional traffic. On full-duplex links, a

receiver may send a PAUSE frame indicating that the transmitter should

cease transmission of frames for a specified period.

When flow control is enabled, the Dell Networking series switches will

observe received PAUSE frames or jamming signals, but will not issue them

when congested.

Auto negotiation allows the switch to advertise modes of operation. The auto

negotiation function provides the means to exchange information between

two switches that share a point-to-point link segment, and to automatically

configure both switches to take maximum advantage of their transmission

capabilities.

Dell Networking series switches enhance auto negotiation by providing

configuration of port advertisement. Port advertisement allows the system

administrator to configure the port speeds that are advertised.

For information about configuring auto negotiation, see "Configuring Port

Characteristics" on page 477.

Switch Feature Overview

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