Last day I connected the Microserver Gen8 and found the light of the iLO NIC port was always off and I also could not find its ip address from the router log, while the other two host NICs worked well.
I thought maybe the iLO processor failed and tried to search any related posts on the internet, and the below one gave me the right answer:iLO通过hponcfg恢复出厂配置
And I fixed it through below steps:
cd /opt/hp/tools ./hponcfg -w ilo.xml more ilo.xml --> check the content ./hponcfg -r ./hponcfg -f ilo.xml
After that, when I plugged the cable into the iLO port, I could ping it.