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Is auto-negotiation required when using Gigabit Ethernet in 1000-base-T or 1000-base-X gigabit modes?

April 26, 2017auto-negotiation Ethernet Gigabit modes

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Is auto-negotiation required when using Gigabit Ethernet in 1000-base-T or 1000-base-X gigabit modes?

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A. Yes. Auto negotiation is required when using Gigabit Ethernet in gigabit-speed mode (1000 base T or X) because the link must resolve a master/slave relationship and this is performed using auto negotiation. It is not required for 10/100 modes but is required for gigabit operation. An IEEE recommended practice for limiting allowable link connection modes and speeds is by leaving auto-negotiation enabled and limiting which modes are allowed by setting the auto-negotiation advertisement registers. Please refer to the IEEE 802.3-2000 specification for additional information.