10G/1G auto negotiation and auto detection mode

The SLX supports 10G/1G auto negotiation and auto detection mode.

Auto negotiation is supported on ports 1 to 24 on the front plate. However, ports 25 to 72 support 1G mode without auto negotiation.
Auto detection occurs when the interface speed is configured based on the detected optic type.
Only full duplex is supported in the CL37 auto-negotiation.

You can manually configure the port speed. In manual mode, the inserted optic must match the configured speed. Otherwise, the link will not come up. You can configure 1G mode with or without auto negotiation. The following speed matrix shows different combinations of modes on the SLX 9540.

Table 1. Port speed matrix
	Ports 1 to 48 on SLX 9540
speed auto (default)	Auto-detection: If 1G SFP optic is detected: Port is configured as 1G with 1000Base-X AN enabled. If 1G SFP copper is detected: Port is configured as SGMII with 1000Base-T AN enabled; 1G, 100Mbps Full-Duplex advertised. If 10G SFP is detected: port is configured as 10G
speed 1000	Force to 1G mode, AN disabled
speed 1000-auto	Force to 1G mode, AN enabled If 1G SFP optic is detected: Port is configured as 1G with 1000Base-X AN enabled. If 1G SFP copper is detected: Port is configured as SGMII with 1000Base-T AN enabled; 1G, 100Mbps Full-Duplex advertised.
speed 10000	Force to 10G mode
Speed 100	If 1G SFP optic is detected: No configuration change; link stays down If 1G SFP copper is detected: Port is configured as SGMII (AN enabled) but 1000Base-T AN disabled.
no speed	Equivalent to speed auto