This counter tallies packets received on a dynamically-signaled transit LSP that this router is merely switching between an upstream and downstream neighbor, not originating or terminating, and like the byte counters it is only exposed on certain platforms. Comparing this value against the outgoing-packet counter on the same row over the same interval lets an admin spot mid-path packet loss on this specific LSP without needing access to the ingress or egress routers. For example, incoming packets reading 4,820,113 against an outgoing count of 4,819,980 on the same row points to roughly 133 packets being silently dropped inside this node's forwarding path for that LSP.