The overruns you’re seeing on the ASR 1002HX port-channel and member interfaces indicate the ingress packets are arriving faster than the interface or forwarding path can process, so packets are being dropped before they reach the input queue. This i...

The issue is happening because your NAT ACL is matching internal subnets too broadly, so when you permit only specific RFC1918 ranges, traffic destined for the FTD one-to-one NAT pool isn’t matching correctly and gets dropped at Gi0/4. When you allow...

The GLC-FE-100LX is a valid choice if your PLC is limited to 100 Mbps over single-mode fiber, but most newer Cisco switches no longer support Fast-Ethernet SFPs, which is why you’re not finding a match. Your best options are to use an older or indust...

Your design goals are clear, and you’re already thinking in the right direction. Using separate areas per spoke absolutely works, but most engineers avoid putting WAN links into non-backbone areas unless there’s a specific need. Keeping all WAN links...

It looks like your trunked router port is flapping, but STP debug alone may not reveal the full cause. You might try enabling debug interface or debug adjacency to see if there are link or protocol-level issues. Also, check for physical layer problem...