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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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How Enhanced Transmission Selection is Implemented

Enhanced transmission selection (ETS) provides a way to optimize bandwidth allocation to outbound 802.1p classes of converged Ethernet traffic. Different traffic types have different service needs. Using ETS, groups within an 802.1p priority class are auto-configured to provide different treatment for traffic with different bandwidth, latency, and best-effort needs.

For example, storage traffic is sensitive to frame loss; interprocess communication (IPC) traffic is latency-sensitive. ETS allows different traffic types to coexist without interruption in the same converged link.

  • NOTE: The IEEE 802.1Qaz, CEE, and CIN versions of ETS are supported.
ETS is implemented on an Aggregator as follows:
  • Traffic in priority groups is assigned to strict-queue or WERR scheduling in a dcb-map and is managed using the ETS bandwidth-assignment algorithm. Dell Networking OS de-qeues all frames of strict-priority traffic before servicing any other queues. A queue with strict-priority traffic can starve other queues in the same port.
  • ETS-assigned bandwidth allocation and scheduling apply only to data queues, not to control queues.
  • Dell Networking OS supports hierarchical scheduling on an interface. Dell Networking OS control traffic is redirected to control queues as higher priority traffic with strict priority scheduling. After control queues drain out, the remaining data traffic is scheduled to queues according to the bandwidth and scheduler configuration in the dcb-map. The available bandwidth calculated by the ETS algorithm is equal to the link bandwidth after scheduling non-ETS higher-priority traffic.
  • By default, equal bandwidth is assigned to each port queue and each dot1p priority in a priority group.
  • By default, equal bandwidth is assigned to each priority group in the dcb-map applied to an egress port. The sum of auto-configured bandwidth allocation to dot1p priority traffic in all ETS priority groups is 100%.
  • dot1p priority traffic on the switch is scheduled according to the default dot1p-queue mapping. dot1p priorities within the same queue should have the same traffic properties and scheduling method.
  • A priority group consists of 802.1p priority values that are grouped together for similar bandwidth allocation and scheduling, and that share the same latency and loss requirements. All 802.1p priorities mapped to the same queue should be in the same priority group.
    • By default:
      • All 802.1p priorities are grouped in priority group 0.
      • 100% of the port bandwidth is assigned to priority group 0. The complete bandwidth is equally assigned to each priority class so that each class has 12 to 13%.
    • The maximum number of priority groups supported in ETS output policies on an interface is equal to the number of data queues (4) on the port. The 802.1p priorities in a priority group can map to multiple queues.
  • A dcb-map is created to associate a priority group with a dcb-map with scheduling and bandwidth configuration, and applied on egress ports.
    • The ETS configuration associated with 802.1p priority traffic in a dcb-map is used in DCBx negotiation with ETS peers.
    • When a dcb-map is applied to an interface, ETS-configured scheduling and bandwidth allocation take precedence over any auto-configured settings in the QoS output policies.
    • ETS is enabled by default with the default ETS configuration applied (all dot1p priorities in the same group with equal bandwidth allocation).

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