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Cisco Bug: CSCvu28874 - Telemetry: erroneous error counts and traces on a sensor path of Cisco-IOS-XR-qos-ma-oper

Last Modified

Sep 03, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.2.3.MGBL 7.1.2.MGBL

Description (partial)

Symptom:
1) show telemetry model-driven subscription a.* internal

Count of fields "Total Other Errors" and "List" "errors" are incrementing for a case of no data of a sensor path.

RP/0/0/CPU0:ios#show telemetry model-driven subscription a.* internal
Mon May 18 15:08:19.951 PDT
Subscription:  app_TEST_200000001
-------------
  State:       ACTIVE
  Sensor groups:
  Id: app_TEST_200000001
    Sample Interval:      10000 ms
    Sensor Path:          Cisco-IOS-XR-qos-ma-oper:qos/nodes/node/policy-map/interface-table/interface/input/service-policy-names/service-policy-instance/statistics
    Sensor Path State:    Resolved

  Destination Groups:
  Group Id: APP_1001
    Encoding:             json
    Transport:            none
    State:                Active
    TLS :                 True
    Total bytes sent:     0
    Total packets sent:   0

  Collection Groups:
  ------------------
    Id: 1
    Sample Interval:      10000 ms
    Encoding:             json
    Num of collection:    8
    Collection time:      Min:     2 ms Max:     4 ms
    Total time:           Min:     5 ms Avg:     6 ms Max:     9 ms
    Total Deferred:       0
    Total Send Errors:    0
    Total Send Drops:     0
    Total Other Errors:   8
    No data Instances:    0
    Last Collection Start:2020-05-18 15:08:17.1718363813 -0700
    Last Collection End:  2020-05-18 15:08:17.1718369677 -0700
    Sensor Path:          Cisco-IOS-XR-qos-ma-oper:qos/nodes/node/policy-map/interface-table/interface/input/service-policy-names/service-policy-instance/statistics

      Sysdb Path:     /oper/qos_ma/node/*/stats/after_clear/if/*/dir/input/pmap-name/*/__rsvdNameForQoSXmlOper
      Count:          8 Method: FINDDATA Min: 2 ms Avg: 2 ms Max: 4 ms
      Item Count:     0 Status: Active
      Missed Collections:0  send bytes: 0 packets: 0 dropped bytes: 0
                      success         errors          deferred/drops
      Gets            0               0
      List            16              8
      Datalist        0               0
      Finddata        8               0
      GetBulk         0               0
      Encode                          0               0
      Send                            0               0

RP/0/0/CPU0:ios#

2) Telemetry trace records errors for case of no data of a sensor path.

RP/0/0/CPU0:ios#show telemetry model-driven trace backend-err reverse
Mon May 18 15:10:45.941 PDT
Trace buffer: backend-err, filename /tmp/ltrace/m2m/mdt/backend-err
30 wrapping entries (1088 possible, 320 allocated, 0 filtered, 30 total)
May 18 15:10:37.565 m2m/mdt/backend-err 0/0/CPU0 t1990  1728 [mdtbk_sysdb_list_walk]: Path /oper/qos_ma/node/0/stats/after_clear/if/GigabitEthernet0_0_0_0/dir/input/pmap-name, sysdb_list failed - err 624206336
May 18 15:10:27.563 m2m/mdt/backend-err 0/0/CPU0 t1990  1696 [mdtbk_sysdb_list_walk]: Path /oper/qos_ma/node/0/stats/after_clear/if/GigabitEthernet0_0_0_0/dir/input/pmap-name, sysdb_list failed - err 624206336
May 18 15:10:17.564 m2m/mdt/backend-err 0/0/CPU0 t1990  1664 [mdtbk_sysdb_list_walk]: Path /oper/qos_ma/node/0/stats/after_clear/if/GigabitEthernet0_0_0_0/dir/input/pmap-name, sysdb_list failed - err 624206336
//...

Conditions:
Subscribe to sensor path Cisco-IOS-XR-qos-ma-oper:qos/nodes/node/policy-map/interface-table/interface/input/service-policy-names/service-policy-instance/statistics and where there is not an input service policy attached to an interface.

For example,

policy-map p1
 class class-default
  set dscp af11
 !
 end-policy-map
!
interface GigabitEthernet0/0/0/0
 service-policy output p1
 shutdown
!
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