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Setting Speed and Duplex
Overview
The Link Speed and Duplex setting lets you choose how the adapter sends and receives data packets over
the network.
In the default mode, an Intel network adapter using copper connections will attempt to auto-negotiate with its
link partner to determine the best setting. If the adapter cannot establish link with the link partner using auto-
negotiation, you may need to manually configure the adapter and link partner to the identical setting to
establish link and pass packets. This should only be needed when attempting to link with an older switch that
does not support auto-negotiation or one that has been forced to a specific speed or duplex mode.
Auto-negotiation is disabled by selecting a discrete speed and duplex mode in the adapter properties sheet.
NOTES:
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When an adapter is running in NPar mode, Speed settings are limited to the root partition of
each port.
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Fiber-based adapters operate only in full duplex at their native speed.
The settings available when auto-negotiation is disabled are:
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40 Gbps full duplex (requires a full duplex link partner set to full duplex). The adapter can send and
receive packets at the same time.
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10 Gbps full duplex (requires a full duplex link partner set to full duplex). The adapter can send and
receive packets at the same time.
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1 Gbps full duplex (requires a full duplex link partner set to full duplex). The adapter can send and
receive packets at the same time. You must set this mode manually (see below).
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10 Mbps or 100 Mbps full duplex (requires a link partner set to full duplex). The adapter can send
and receive packets at the same time. You must set this mode manually (see below).
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10 Mbps or 100 Mbps half duplex (requires a link partner set to half duplex). The adapter performs
one operation at a time; it either sends or receives. You must set this mode manually (see below).
Your link partner must match the setting you choose.
NOTES:
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Although some adapter property sheets (driver property settings) list 10 Mbps and 100 Mbps
in full or half duplex as options, using those settings is not recommended.
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Only experienced network administrators should force speed and duplex manually.
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You cannot change the speed or duplex of Intel adapters that use fiber cabling.
Intel 10 Gigabit adapters that support 1 gigabit speed allow you to configure the speed setting. If this option is
not present, your adapter only runs at its native speed.
If the adapter cannot establish link with the gigabit link partner using auto-negotiation, set the adapter to 1
Gbps Full duplex .
Intel 10 gigabit fiber-based adapters and SFP direct-attach devices operate only in full duplex, and only at their
native speed. Multi-speed 10 gigabit SFP+ fiber modules support full duplex at 10 Gbps and 1 Gbps.
Auto-negotiation and Auto-Try are not supported on devices based on the Intel® Ethernet Connection X552
controller and Intel® Ethernet Connection X553 controller.