13.1 Auto-Negotiation

The Auto-Negotiation function is an optional part of the Ethernet standard that makes it possible for devices to exchange information about their abilities over a link segment. This, in turn, allows the devices to perform automatic configuration to achieve the best possible mode of operation over a link. At a minimum, Auto-Negotiation can provide automatic speed matching for multi-speed devices at each end of a link. Multi-speed Ethernet interfaces can then take advantage of the highest speed offered by a multi-speed hub port.

The Auto-Negotiation protocol includes automatic sensing for other capabilities as well. For example, a hub that is capable of supporting full duplex operation (described later in this chapter) on some or all of its ports can advertise that fact with the Auto-Negotiation protocol. Interfaces connected to the hub that also support full duplex operation can then configure themselves to use the full duplex mode in interaction with the hub.

Quick Reference Guide to Auto-Negotiation - 25 MAY 96

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