Packets/Drops are seen in the PFE Chassis queue for interface that are down/not configured on 4x 1GE (LAN), IQ2E PIC. This article explains this behavior.
Packets/Drops are seen in the PFE Chassis queue for interface down/not configured on 4x 1GE(LAN), IQ2E PIC.
On the PIC (4x 1GE IQ2E), the statistics shown for the Packet Forwarding Engine Chassis Queues represent a cumulative total or all four ports in the PIC. Customers may see this even if the interface is not configured or is physically down.
OSPF 1.1.1.1 R1 -----------<ge-0/0/0> R2 <ge-0/0/2>-------------- R3 3.3.3.3 10.1.1.1 20.1.1.1
Note: On R2, <ge-0/0/1> status is Physical Down *
R2> show chassis hardware detail Hardware inventory: FPC 0 E-FPC PIC 0 REV 06 750-024781 AABM7878 4x 1GE(LAN), IQ2E <<<<<< Xcvr 0 REV 01 740-031980 AHP0JU2 SFP-SX Xcvr 2 REV 02 740-011613 PH51QAP SFP-SX [edit] lab# run show interfaces terse |match ge ge-0/0/0 up up ge-0/0/0.0 up up inet 10.1.1.2/30 <<<< towards R1 ge-0/0/1 up down ge-0/0/2 up up ge-0/0/2.0 up up inet 20.1.1.2/30 << towards R3 ge-0/0/3 up down
Clearing the statistics on the PIC to confirm the behavior.
Note: Only 2 interfaces are up on IQ2E PIC.
R2> clear interfaces statistics ge-0/0/0* R2> clear interfaces statistics ge-0/0/1 R2> clear interfaces statistics ge-0/0/2* R2> clear interfaces statistics ge-0/0/3 lab# show interfaces ge-0/0/1 <<<<< not configured
Ping from R1 loopback to R3 loopback:
[edit] lab@1# run ping 3.3.3.3 rapid count 5632 PING 3.3.3.3 (3.3.3.3): 56 data bytes !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Check Packet Forwarding Engine Chassis Queues counters for PIC IQ2E interfaces: i.e. ge-0/0/0 and ge-0/0/1
lab# run show interfaces queue ge-0/0/0 << configured interface Packet Forwarding Engine Chassis Queues: Queues: 8 supported, 4 in use Queue: 0, Forwarding classes: best-effort Queued: Packets : 5632 0 pps <<<<< Packet Forwarding Engine Chassis Queues Bytes : 473088 0 bps Tail-dropped packets : 0 0 pps RED-dropped packets : 0 0 pps Low, non-TCP : 0 0 pps Low, TCP : 0 0 pps High, non-TCP : 0 0 pps High, TCP : 0 0 pps RED-dropped bytes : 0 0 bps Low, non-TCP : 0 0 bps Low, TCP : 0 0 bps High, non-TCP : 0 0 bps High, TCP : 0 0 bps lab# run show interfaces queue ge-0/0/1 <<<< not a configured interface Packet Forwarding Engine Chassis Queues: Queues: 8 supported, 4 in use Queue: 0, Forwarding classes: best-effort Queued: Packets : 5632 0 pps <<<< cumulative total for all 4 ports Bytes : 473088 0 bps Transmitted: Packets : 5632 0 pps Bytes : 473088 0 bps Tail-dropped packets : 0 0 pps RED-dropped packets : 0 0 pps Low, non-TCP : 0 0 pps Low, TCP : 0 0 pps High, non-TCP : 0 0 pps High, TCP : 0 0 pps RED-dropped bytes : 0 0 bps Low, non-TCP : 0 0 bps Low, TCP : 0 0 bps High, non-TCP : 0 0 bps High, TCP : 0 0 bps
Therefore, on the PIC (4x 1GE IQ2E) the statisics shown for the Packet Forwarding Engine Chassis Queues represents a cumulative total for all four ports in the PIC.