Why do two GE interfaces work at 100 Mbit/s after auto-negotiation

When the link between the two interfaces is unstable during auto-negotiation, negotiation packets are lost. The two interfaces negotiate a speed in descending order of speeds (1000M->100M->10M). If they work at 100 Mbit/s after the negotiation, the reason is that the link between them is unstable. For example, the network cable is shaking, the RJ45 connector on an end is not properly connected, or the network cable is faulty. To make the two interfaces work at a specified speed, run the auto speed command on the interfaces.

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