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What is speed duplex mismatch?
A duplex mismatch occurs when two devices connected by Ethernet do not properly negotiate their connection. Ethernet has the option of running at different speeds (10, 100, or 1 Gbps) and has the option of running half duplex or full duplex. A duplex mismatch will cause constant packet loss.
What is 100 Mbps full duplex?
Full duplex (FDX) switches allow for the simultaneous transmission of information between the switch and the endpoint. One file is at the head end (switch end), and the other is at the endpoint. The two files are 150Mb in size, and the switch can deliver 100Mbps, full duplex.
How to set duplex speed to 100 Mbps?
In this lab, we will configure the speed to 100 Mbps and the duplex mode to full. Duplex mode should be configured on both the switches. Now, to configure the duplex and speed, we will have to go into the specific interface on which we want to hard-code the duplex setting.
What can be caused by speed / duplex mismatch?
The router however is configured with a lower speed (10Mbps in this case). When traffic volumes increase above the configured speed, the router will start dropping packets. Duplex: On a direct link like this, both sides should be configured as Full-Duplex (as long as the physical cabling supports it, which now-days, most will).
When to use manual speed or full duplex?
Be aware that mixing autonegotiation with manually set full duplex is likely to lead to a duplex mismatch. You should only use manual speed/duplex if you have problems with autonegotiation and if you do use it you should use it on both ends of the link.
Can a Cisco device detect the duplex mode?
Even though the Cisco auto-negotiation for duplex selection works perfectly most of the times, however in some instances, a Cisco device is unable to detect the duplex mode and it may result in a duplex mismatch. This could results in a collision in the network.