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Connection failure with 1000BASE-T NIC when auto-negotiation is disabled on switch / router
Symptoms
  • Connectivity problems or interface keeps fliping to half duplex when auto-negotiation is disabled on switch / router.
Cause

Auto-negotiation is a requirement for using 1000BASE-T according to Section 28D.5 Extensions required for Clause40 (1000BASE-T). At least the clock source has to be negotiated, as one has to be master and the other slave.


Solution
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