P10 SMs having NO LINK on Ethernet Interface

I have some P10 SMs with upgraded 8.2.x and I found some SMs connected to WAN Ports of routers to be having NO LINK status on ETHERNET INTERFACE.

What can you suggest to help?

I guess I did a little bit of success on this.

When I check all 10mb and 100mb options, it wouldn’t reach 30sec and it says, NO LINK… But now, am bit solved and healed.