Ethernet ACT-LED not working

I have flashed the Jetson TX2 on the development kit and found that only the LINK-LED is active; the ACT-LED is always dark. This is on a freshly flashed TX2 with Jetpack 3.2.1.

Does it affect the function for ethernet?

Please also refer this topic:

No it does not affect the function. Thanks for the link.
How do I set DMIC4_CLK to low in order to ensure that the PHY chip will enter RGMII mode?