Verify that DUT does not drop bursty traffic.

• Topology:

  • 2 input interfaces and 1 output interface with the same port speed. The interface can be a physical interface or LACP bundle interface with the same aggregated speed.

    ATE port 1
        |
       DUT--------ATE port 3
        |
    ATE port 2
  

• Traffic classes:

  • We will use 7 traffic classes NC1, AF4, AF3, AF2, AF1, BE0 and BE1.

• Traffic types:

  • All the traffic tests apply to both IPv4 and IPv6 traffic.

• Queue types:

  • NC1 will have strict priority queues
    • AF4/AF3/AF2/AF1/BE1/BE0 will use WRR queues.
  • NC1 will have strict priority queue.
    • AF4, AF3, AF2, AF1, BE1 and BE0 will use WRR queues.

• Test results should be independent of the location of interfaces. For example, 2 input interfaces and output interface could be located on

  • Same ASIC-based forwarding engine
  • Different ASIC-based forwarding engine on same line card
  • Different ASIC-based forwarding engine on different line cards

• Test results should be the same for port speeds 100G and 400G.

• Counters should be also verified for each test case:

  • /qos/interfaces/interface/output/queues/queue/state/transmit-pkts
  • /qos/interfaces/interface/output/queues/queue/state/dropped-pkts
  • transmit-pkts should be equal to the number of Rx pkts on Ixia port
  • dropped-pkts should be equal to diff between the number of Tx and the number Rx pkts on Ixia ports

• Latency:

  • Should be < 100000ns

• Connect DUT port-1 to ATE port-1, DUT port-2 to ATE port-2 and DUT port-3 to ATE port-3.

• Configuration:

  • Configure strict priority queues for NC1 and AF4 with NC1 having higher priority.
  • Configure WRR for AF4, AF3, AF2, AF1, BE0 and BE1 with weight 48, 12, 8, 4, 1 and 1 respectively.

• Verify that there is no traffic loss with bursty traffic

  • NC1 traffic from Input interface 1 and 2:

  Interface#	Rate(%)	Frame size	Packet count	Inter-pkt gap(bytes)	inter burst gap(bytes)	Output(%)
  1	45	512	1200	12	48000	100
  2	50	512	1200	12	96000	100

  • Repeat the above test case for other traffic classes::
    • AF4
    • AF3
    • AF2
    • AF1
    • BE1
    • BE0

This yaml defines the OC paths intended to be covered by this test. OC paths used for test environment setup are not required to be listed here.

paths:
  ## Config paths
  ### Classifiers
  /qos/classifiers/classifier/config/name:
  /qos/classifiers/classifier/config/type:
  /qos/classifiers/classifier/terms/term/actions/config/target-group:
  /qos/classifiers/classifier/terms/term/conditions/ipv4/config/dscp-set:
  /qos/classifiers/classifier/terms/term/conditions/ipv6/config/dscp-set:
  /qos/classifiers/classifier/terms/term/config/id:

  ### Forwarding Groups
  /qos/forwarding-groups/forwarding-group/config/name:
  /qos/forwarding-groups/forwarding-group/config/output-queue:

  ### Queue
  /qos/queues/queue/config/name:

  ### Interfaces
  /qos/interfaces/interface/input/classifiers/classifier/config/name:
  /qos/interfaces/interface/output/queues/queue/config/name:
  /qos/interfaces/interface/output/scheduler-policy/config/name:

  ### Scheduler policy
  /qos/scheduler-policies/scheduler-policy/config/name:
  /qos/scheduler-policies/scheduler-policy/schedulers/scheduler/config/priority:
  /qos/scheduler-policies/scheduler-policy/schedulers/scheduler/config/sequence:
  /qos/scheduler-policies/scheduler-policy/schedulers/scheduler/config/type:
  /qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/id:
  /qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/input-type:
  /qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/queue:
  /qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/weight:

  ## State paths
  /qos/interfaces/interface/output/queues/queue/state/transmit-pkts:
  /qos/interfaces/interface/output/queues/queue/state/transmit-octets:
  /qos/interfaces/interface/output/queues/queue/state/dropped-pkts:
  /qos/interfaces/interface/output/queues/queue/state/dropped-octets:

rpcs:
  gnmi:
    gNMI.Set:
    gNMI.Subscribe: