QoS OUTPUT POLICY modeDell(conf-qos-policy-out)#bandwidth-percentage 1004. Exit QoS Output Policy Configuration mode.QoS OUTPUT POLICY modeDell(conf-if-te-0/1)#exit5. Enter INTERFACE Configuration mode.CONFIGURATION modeinterface type slot/port6. Apply the QoS output policy with the bandwidth percentage for specified priority queues to an egress interface.INTERFACE modeDell(conf-if-te-0/1)#service-policy output test12Configuring ETS in a DCB MapAn S4048–ON switch supports the use of a DCB map in which you configure enhanced transmission selection (ETS) setting. Toconfigure ETS parameters, you must apply a DCB map on an S4048–ON interface. This functionality is supported on the S4048–ONplatform.ETS Configuration NotesETS provides a way to optimize bandwidth allocation to outbound 802.1p classes of converged Ethernet traffic. Different traffic typeshave different service needs. Using ETS, you can create groups within an 802.1p priority class to configure different treatment fortraffics with different bandwidth, latency, and best-effort needs.When you configure ETS in a DCB map:• The DCB map associates a priority group with a PFC operational mode (on or off) and an ETS scheduling and bandwidthallocation. You can apply a DCB map on multiple egress ports.• Use the ETS configuration associated with 802.1p priority traffic in a DCB map in DCBx negotiation with ETS peers.• Traffic in priority groups is assigned to strict-queue or weighted round-robin (WRR) scheduling in an ETS configuration and ismanaged using the ETS bandwidth-assignment algorithm. Dell Networking OS de-queues all frames of strict-priority trafficbefore servicing any other queues. A queue with strict-priority traffic can starve other queues in the same port.• ETS-assigned bandwidth allocation and strict-priority scheduling apply only to data queues, not to control queues.• Dell Networking OS supports hierarchical scheduling on an interface. The control traffic on Dell Networking OS is redirected tocontrol queues as higher priority traffic with strict priority scheduling. After the control queues drain out, the remaining datatraffic is scheduled to queues according to the bandwidth and scheduler configuration in the DCB map. The available bandwidthcalculated by the ETS algorithm is equal to the link bandwidth after scheduling non-ETS higher-priority traffic.• The configuration of bandwidth allocation and strict-queue scheduling is not supported at the same time for a priority group.• Bandwidth assignment: By default, equal bandwidth is assigned to each dot1p priority in a priority group. To configure thebandwidth assigned to the port queues associated with dot1p priorities in a priority group, use the bandwidth percentageparameter. The sum of the bandwidth allocated to all priority groups in a DCB map must be 100% of the bandwidth on the link.You must allocate at least 1% of the total bandwidth to each priority group.• Scheduling of priority traffic: dot1p priority traffic on the switch is scheduled to the current queue mapping. dot1p prioritieswithin the same queue must have the same traffic properties and scheduling method.• ETS configuration error: If an error occurs in an ETS configuration, the configuration is ignored and the scheduler andbandwidth allocation settings are reset to the ETS default value: 100% of available bandwidth is allocated to priority group 0 andthe bandwidth is equally assigned to each dot1p priority.If an error occurs when a port receives a peer’s ETS configuration, the port’s configuration resets to the ETS configuration in thepreviously configured DCB map. If no DCB map was previously applied, the port resets to the default ETS parameters.Data Center Bridging (DCB) 257
