Question

Explain, If a device is configured with bandwidth and duplex settings on automatic, does the device at the other end of the connection have to be set to automatic as well?Explain, If a device is configured with bandwidth and duplex settings on automatic, does the device at the other end of the connection have to be set to automatic as well?

Answer 1

YES , if a device is configured with bandwidth and duplex settings on automatic, the device at the other end of the connection have to be set to automatic as well.

otherwise duplex mismatch will occur.

To provide full-duplex operation, both the station interface (controller ) and the transceiver at each station must support and be configured for full-duplex operation.

It is essential that both ends of a link operating in full-duplex mode are configured correctly, or the link will have serious data errors. To ensure correct configuration, the standard recommends that Ethernet Auto-Negotiation be used whenever possible to automatically configure full-duplex mode.

However, using Auto-Negotiation to configure full-duplex operation on a link may not be as simple as it sounds.

A duplex mismatch occurs when two devices connected by Ethernet do not properly negotiate their connection. ... In some cases that negotiation fails, and one end decides to run full duplex while the other end decides to run half duplex. Because the two endpoints are not running a common protocol, packet loss occurs.

A duplex mismatch can be fixed by either enabling autonegotiation (if available and working) on both ends or by forcing the same settings on both ends (availability of a configuration interface permitting).