"Drops for unrecognized upper-level protocol" means that we've receivedpackets of a type that you haven't configured and therefore don't have ahandler for in the interface protocol handling chain. That may be (and most likely is) expected and purely...

I was looking up a similar case for ASR-9001 platform IOS XR code 4.3.2 and alerts looked like below:   As I further checked on this the interface counters looked clean and there were no drops and signs of congestion/discards. All of the ingress and ...