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Rate-limit drop counters are inaccurately shown in the output of 'show interface queue'

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Article ID: KB25138 KB Last Updated: 12 Jul 2012Version: 1.0
Summary:
This article describes the issue of the Rate-limit drop statistics being inaccurately shown in the output of the show interface queue command on certain MPC's without QX.
Symptoms:
When queue rate-limit is configured for interfaces on MPC Type 1 3D or MPC Type 2 3D (that is, non-Q/EQ MPCs), the output of show interfaces queue for such interfaces does not display the count of packets and bytes being dropped due to rate-limit.
linzhang@mars-re0> show interfaces queue ae11 forwarding-class VOIP egress
Physical interface: ae11, Enabled, Physical link is Up
Interface index: 139, SNMP ifIndex: 1306
Description: bundle to ex1
Forwarding classes: 16 supported, 7 in use
Egress queues: 8 supported, 7 in use
Queue: 7, Forwarding classes: VOIP
Queued:
Packets : 9349117794 142560 pps
Bytes : 822722365872 100362792 bps
Transmitted:
Packets : 9349117794 142560 pps < 142K
Bytes : 822722365872 100362792 bps
Tail-dropped packets : 0 0 pps
RED-dropped packets : 0 0 pps
Low : 0 0 pps
Medium-low : 0 0 pps
Medium-high : 0 0 pps
High : 0 0 pps
RED-dropped bytes : 0 0 bps
Low : 0 0 bps
Medium-low : 0 0 bps
Medium-high : 0 0 bps
High : 0 0 bps
In version 11.4R1.4, the drop stats are in red.
Cause:

Solution:
This issue is due to a software bug. This issue has been resolved in 11.2R7, 11.4R3, and 12.1R2.
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