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[MX] The output of 'show interfaces queue IFD' is not accurate

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Article ID: KB16567 KB Last Updated: 19 Feb 2020Version: 2.0
Summary:
This article describes the issue of the output of 'show interfaces queue IFD' being inaccurate.
Symptoms:
The output of  show interface queue IFD is not accurate. The example below, is a single IFL sending 350MB of data. The total trasmit bps rate is not accurate.
{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9 egress forwarding-class be 

Physical interface: ge-10/0/9, Enabled, Physical link is Up

Interface index: 240, SNMP ifIndex: 270

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              99090321                 74965 pps

Bytes                :          116825042148             599723992 bps

Transmitted:

Packets              :              46863385                 43729 pps

Bytes                :           52741156948             349832520 bps <=== ok

Tail-dropped packets :              29921244                  1159 pps

RED-dropped packets  :              22305692                 30076 pps

Low                 :              22305692                 30076 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           22305692000             240612488 bps

Low                 :           22305692000             240612488 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9 egress forwarding-class be    

Physical interface: ge-10/0/9, Enabled, Physical link is Up

Interface index: 240, SNMP ifIndex: 270

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              99544823                101451 pps

Bytes                :          117279544148             811610712 bps

Transmitted:

Packets              :              47128493                 59175 pps

Bytes                :           53006264948             473407136 bps  <=== ?

Tail-dropped packets :              29928498                  1619 pps

RED-dropped packets  :              22487832                 40656 pps

Low                 :              22487832                 40656 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           22487832000             325250000 bps

Low                 :           22487832000             325250000 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9 egress forwarding-class be    

Physical interface: ge-10/0/9, Enabled, Physical link is Up

Interface index: 240, SNMP ifIndex: 270

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              99696324                 44822 pps

Bytes                :          117431045148             358582248 bps

Transmitted:

Packets              :              47216884                 26151 pps

Bytes                :           53094655948             209209464 bps  <=== ?

Tail-dropped packets :              29930747                   665 pps

RED-dropped packets  :              22548693                 18006 pps

Low                 :              22548693                 18006 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           22548693000             144049704 bps

Low                 :           22548693000             144049704 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9 egress forwarding-class be    

Physical interface: ge-10/0/9, Enabled, Physical link is Up

Interface index: 240, SNMP ifIndex: 270

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              99999325                123171 pps

Bytes                :          117734046148             985369104 bps

Transmitted:

Packets              :              47393594                 71833 pps

Bytes                :           53271365948             574666664 bps

Tail-dropped packets :              29935437                  1906 pps

RED-dropped packets  :              22670294                 49431 pps

Low                 :              22670294                 49431 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           22670294000             395450400 bps

Low                 :           22670294000             395450400 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9 egress forwarding-class be    

Physical interface: ge-10/0/9, Enabled, Physical link is Up

Interface index: 240, SNMP ifIndex: 270

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              99999325                123171 pps

Bytes                :          117734046148             985369104 bps

Transmitted:

Packets              :              47393594                 71833 pps

Bytes                :           53271365948             574666664 bps

Tail-dropped packets :              29935437                  1906 pps

RED-dropped packets  :              22670294                 49431 pps

Low                 :              22670294                 49431 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           22670294000             395450400 bps

Low                 :           22670294000             395450400 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9 egress forwarding-class be    

Physical interface: ge-10/0/9, Enabled, Physical link is Up

Interface index: 240, SNMP ifIndex: 270

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :             100150825                 45978 pps

Bytes                :          117885546148             367830040 bps

Transmitted:

Packets              :              47481983                 26825 pps

Bytes                :           53359754948             214601512 bps

Tail-dropped packets :              29937781                   711 pps

RED-dropped packets  :              22731061                 18442 pps

Low                 :              22731061                 18442 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           22731061000             147537480 bps

Low                 :           22731061000             147537480 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9.1000 egress forwarding-class be 

Logical interface ge-10/0/9.1000 (Index 109) (SNMP ifIndex 1563) 

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              57519820                 74998 pps

Bytes                :           57519799408             600003952 bps

Transmitted:

Packets              :              33556220                 43755 pps

Bytes                :           33556199408             350047520 bps

Tail-dropped packets :                889562                  1141 pps

RED-dropped packets  :              23074038                 30102 pps

Low                 :              23074038                 30102 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           23074038000             240823760 bps

Low                 :           23074038000             240823760 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9.1000 egress forwarding-class be    

Logical interface ge-10/0/9.1000 (Index 109) (SNMP ifIndex 1563) 

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              57603759                 74943 pps

Bytes                :           57603738408             599564280 bps

Transmitted:

Packets              :              33605156                 43692 pps

Bytes                :           33605135408             349542856 bps

Tail-dropped packets :                890804                  1108 pps

RED-dropped packets  :              23107799                 30143 pps

Low                 :              23107799                 30143 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           23107799000             241150000 bps

Low                 :           23107799000             241150000 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

user@router# run show interfaces queue ge-10/0/9.1000 egress forwarding-class be    

Logical interface ge-10/0/9.1000 (Index 109) (SNMP ifIndex 1563) 

Forwarding classes: 16 supported, 8 in use

Egress queues: 8 supported, 8 in use

Queue: 0, Forwarding classes: be 

Queued:

Packets              :              57603759                 74943 pps

Bytes                :           57603738408             599564280 bps

Transmitted:

Packets              :              33605156                 43692 pps

Bytes                :           33605135408             349542856 bps

Tail-dropped packets :                890804                  1108 pps

RED-dropped packets  :              23107799                 30143 pps

Low                 :              23107799                 30143 pps

Medium-low          :                     0                     0 pps

Medium-high         :                     0                     0 pps

High                :                     0                     0 pps

RED-dropped bytes    :           23107799000             241150000 bps

Low                 :           23107799000             241150000 bps

Medium-low          :                     0                     0 bps

Medium-high         :                     0                     0 bps

High                :                     0                     0 bps



{MASTER}[edit]

Solution:
Please wait for about 10 seconds between successive show interface commands. When the per-unit or hierarchical schedulers are configured, the software sums up the stats of the child nodes and this is not often enough for the stats to be accurate.
 
Modification History:
2020-02-19: minor non-technical updates.
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