![]() ![]() You must manually configure these ports using the settings below.ĭepending upon the connector used for a port, enabling auto-negotiation also enables forward error correction (FEC), if the cable requires it (see the table below). You cannot disable auto-negotiation on 1GT or 10GT fixed copper switch ports.įor 1000BASE-T RJ-45 SFP adapters, auto-negotiation is automatically done on the SFP PHY, so enabling auto-negotiation on the port settings is not required.Disabling auto-negotiation on a 1G optical cable prevents detection of single fiber breaks.You must manually set any non-default link speed, duplex, pause, and FEC.If you do decide to disable auto-negotiation, be aware of the following: To enable a simpler configuration, Cumulus Linux allows you to configure auto-negotiation on all port types on Broadcom switches the port configuration software then configures the underlying hardware according to its capabilities. Some module types support auto-negotiation while others do not. If you disable auto-negotiation later or never enable it, then you have to configure any settings that deviate from the port default - such as duplex mode, FEC, and link speed settings. ![]() For RJ-45 SFP adapters, you need to manually configure the desired link speed and auto-negotiation as described in the default settings table below. Auto-negotiationīy default on a Broadcom-based switch, auto-negotiation is disabled - except on 10G and 1000BASE-T fixed copper switch ports, where it is required for links to work. Breakout port configuration, logical switch port limitations, and troubleshooting is also provided. ![]() This topic describes the auto-negotiation, link speed, duplex mode, MTU, and FEC settings and provides a table showing the default configuration for various port and cable types. When enabled, Cumulus Linux automatically configures the best link parameter settings based on the module type (speed, duplex, auto-negotiation, and FEC, where supported). ![]() You can disable FEC if necessary, which forces the firmware to not try any FEC options.įor Broadcom-based switches, consider enabling auto-negotiation on each port. Most of these settings are configured automatically for you, depending upon your switch ASIC however, you must always set MTU manually.įor NVIDIA Spectrum ASICs, the firmware configures FEC, link speed, duplex mode and auto-negotiation automatically, following a predefined list of parameter settings until the link comes up.
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