Verify that DUT set ECN (ECT and CE) bits to 1 for all ECN capable packets > minimum threshold.

• 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, BE1 and BE0.

• 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.

• 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

  • ECN profile can be created for different queues. ECN profiles per queue can be applied to the output side of interfaces.

    min-threshold | max-threshold | enable-ecn | drop | weight | max-drop-probability-percent ------------- | ------------- | ---------- | ----- | ------- | ---------------------------- 80000 | 2^64-1 | true | false | not set | 1

    • Note: max-threshold is set to max uint64 value 2^64-1 or 18446744073709551615.

• Send oversubscribed traffic with ECT or CE set to 1 from 2 input interfaces to trigger ECN bits to be set to 1.

  Traffic class | Interface1(line rate %) | Interface2(line rate %) | ECN bits ------------- | ----------------------- | ----------------------- | -------- NC1 | 51 | 50 | 1

• Verify that ECN bits are set with packet drop counter dropped-pkts incremented.

• Repeat the above test cases for other traffic classes:

  • AF4
  • AF3
  • AF2
  • AF1
  • BE1
  • BE0

• Repeat the above case by sending oversubscribed traffic with both ECT and CE cleared instead of one of them being set to 1 from 2 input interfaces.

• Verify that ECN bits are NOT set and packet drop counter dropped-pkts is incremented.

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

paths:
  /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:
  /qos/forwarding-groups/forwarding-group/config/name:
  /qos/forwarding-groups/forwarding-group/config/output-queue:
  /qos/queues/queue/config/name:
  /qos/interfaces/interface/input/classifiers/classifier/config/name:
  /qos/interfaces/interface/output/queues/queue/config/name:
  /qos/interfaces/interface/output/scheduler-policy/config/name:
  /qos/interfaces/interface/output/queues/queue/config/queue-management-profile:
  /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/queue-management-profiles/queue-management-profile/wred/uniform/config/min-threshold:
  /qos/queue-management-profiles/queue-management-profile/wred/uniform/config/max-threshold:
  /qos/queue-management-profiles/queue-management-profile/wred/uniform/config/enable-ecn:
  /qos/queue-management-profiles/queue-management-profile/wred/uniform/config/weight:
  /qos/queue-management-profiles/queue-management-profile/wred/uniform/config/drop:
  /qos/queue-management-profiles/queue-management-profile/wred/uniform/config/max-drop-probability-percent:
  /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:
      Replace: