Auto-negotiation

Two Ethernet Ports Connected By An Rj45 Cable With Glowing Internal Wire Pairs Showing An Automatic Crossover, Next To A Green Checkmark Indicating A Successful Auto-Mdix Link
CCNA

Auto-MDIX on Cisco Devices: How It Works and How to Configure It

The port on a workstation, laptop, or server is called MDI (Media Dependent Interface). The port on a network switch, by contrast, is traditionally MDIX (Media Dependent Interface with Crossover). This distinction exists because someone has to “cross” the transmit and receive pairs somewhere in the connection, and historically, that job fell to whichever end...

Asad Ijaz 8 min read
Technical Diagram Showing Three Cisco Switch Port Connection Scenarios: Successful Auto-Negotiation In Green, Duplex Mismatch With Collision Icon In Red, And Speed Mismatch With Link-Down Indicator In Amber, With Cli Commands Below
CCNA

Duplex and Speed Settings on Cisco Switches: Complete Configuration Guide

Duplex and speed settings are the most fundamental configuration parameters for each switch port. By default, Cisco switches auto-negotiate both speed and duplex with connected devices. When this negotiation works correctly, both ends of the link establish the highest common speed and the best available duplex mode without any manual intervention. When it fails —...

Muhammad Khattak 10 min read
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