When a link LED does not light (indicating loss of link between two devices), the most common reason is a failure of port auto-negotiation between the connecting ports. If a link LED fails to light when you connect the switch to a port on another device, do the following:
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Ensure that the switch port and the port on the attached end-node are both set to Auto mode.
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If the attached end-node does not have an Auto mode setting, you must manually configure the switch port to the same setting as the end-node port. See Chapter 10, "Port Status and Configuration".