Class Discussion - What are some problems that happen if there is a speed or duplex mismatch on PDF

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What are some problems that happen if there is a speed or duplex mismatch on a switch port?...

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Intermediate Information Technology and Networking Class Discussion

TOPIC 3: (Refers to Lesson #3) What are some problems that happen if there is a speed or duplex mismatch on a switch port?

Switch port duplex mismatch problems occur when the switch port and attached computer are not configured to use the same duplex setting or for both ends to auto negotiate the setting. In a virtual environment, technically if there is a speed/duplex mismatch on the switch port it will result in constant packet loss. This problem cannot be usually experienced in low to mediumsized networks since by default TCP has excellent packet recovery mechanisms intended to address a situation like this. However, in networks with a high volume of traffic, this scenario would cause experience issues and degraded network performance due to slow/loss of connectivity to services on this particular link. For example, the other end is using the halfduplex mode by default the full-duplex will continue to transmit data and starve the half-duplex in the other end causing frames to be queued and eventually dropped.

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Switch port duplex mismatch problems are a real pain! They occur when the switch port and attached computer are not configured to use the same duplex setting or for both ends to auto negotiate the setting. Regardless of the setting the connection seems to work fine at low traffic levels, particularly for ping packets. But as the traffic level grows, the errors increase, affecting network throughput. Unless you monitor the errors on every switch port, you may not be aware of the problem. Errors will accumulate on each end of the misconfigured link. The half duplex end will see late collisions, alignment errors, and FCS errors. The full duplex end will see FCS errors....