Verify that DUT supports QoS config and forward QoS traffic correctly.

• 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 and AF4 will have strict priority queues with NC1 having higher priority.
    • 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.

• 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.
  • Configure WRR for AF4, AF3, AF2, AF1, BE0 and BE1 with weight 48, 12, 8, 4, 1 and 1 respectively.

• Counters should be 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

• Non-oversubscription traffic test case 1 with 80% of aggregated linerate

  Traffic class	Interface1(line rate %)	Interface2(line rate %)	Rx from interface1(%)	Rx from interface2(%)
  NC1	3	3	100	100
  Af4	24	24	100	100
  AF3	6	6	100	100
  AF2	4	4	100	100
  AF1	2	2	100	100
  BE0	0.5	0.5	100	100
  BE1	0.5	0.5	100	100

• Non-oversubscription traffic test case 2 with 98% of aggregated linerate

  Traffic class	Interface1(line rate %)	Interface2(line rate %)	Rx from interface1(%)	Rx from interface2(%)
  NC1	5	4	100	100
  Af4	30	30	100	100
  AF3	7.5	7.5	100	100
  AF2	4	4	100	100
  AF1	2	2	100	100
  BE0	0.5	0.5	100	100
  BE1	0.5	0.5	100	100

• Verify that there is no traffic loss

• Initiate traffic

• Counters should be verified using gNMI subscribe with sample mode

  • Run the test twice, once with a SAMPLE interval of 10 Seconds and once again with a SAMPLE interval of 15 seconds for the below telemetry 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

• Ensure counter of all queues increment at the selected SAMPLE interval

• 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

• /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

• gNMI
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