I noticed some tail dropped packets on one of my interface on MX960.
Queue: 1, Forwarding classes: C2 Queued: Packets : 221452493724 163821 pps Bytes : 45170152624024 249068288 bps Transmitted: Packets : 221452467949 163821 pps Bytes : 45170120315215 249068288 bps Tail-dropped packets : 21854 0 pps RL-dropped packets : 0 0 pps RL-dropped bytes : 0 0 bps RED-dropped packets : 3921 0 pps Low : 3911 0 pps
I understand that RED-dropped packets are drops which occured on output queue of egress PFE, due to RED mecanism which start to empty the queue. But tail dropped packets is unclear for me. Does it mean packets which have been dropped by egress PFE, or does it mean packets dropped by ingress PFE, because egress PFE has applied backpressure to ingress PFE as it was not able to forward packets, due to output queue being full?
Thanks for your help.
Tail-dropped packets—Number of packets dropped because the queue buffers were full.