H3C S5820X Series Configuration Manual

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H3C S5820X Series Configuration Manual Manual pdf 60 page image

6-4Additionally, WFQ can work with the minimum guaranteed bandwidth mechanism. You can configure aminimum guaranteed bandwidth for each WFQ queue, so that each WFQ queue is guaranteed of thebandwidth when congestion occurs. The assignable bandwidth (total bandwidth – the sum of theminimum guaranteed bandwidth for each queue) is allocated to queues based on queue priority.For example, assume that the total bandwidth of a port is 10 Mbps, and that there are five flows on theport currently, with a precedence of 0, 1, 2, 3, and 4 and a minimum guaranteed bandwidth of 128 kbps,128 kbps, 128 kbps, 64 kbps, and 64 kbps respectively.z The assignable bandwidth = 10 Mbps – (128 kbps + 128 kbps + 128 kbps + 64 kbps + and 64kbps) = 9.5 Mbpsz The total assignable bandwidth quota is the sum of the (precedence value + 1)s, which is 1 + 2 + 3+ 4 + 5 = 15.z The bandwidth percentage assigned to each flow is (precedence value of the flow + 1)/totalassignable bandwidth quota. The bandwidth percentages for the flows are 1/15, 2/15, 3/15, 4/15,and 5/15 respectively.z The bandwidth finally assigned to a queue = the minimum guaranteed bandwidth + the bandwidthallocated to the queue from the assignable bandwidthBecause WFQ can balance delay and jitter among congested flows, it can be applied in certain specialscenarios. For example, WFQ is used for the assured forwarding (AF) services of the ResourceReservation Protocol (RSVP). In GTS, WFQ schedules buffered packets.SP+WRR queuingBy assigning some queues on the port to the SP scheduling group and the others to the WRRscheduling group (group 1), you implement SP + WRR queue scheduling on the port. Packets in theSP scheduling group are scheduled preferentially. When the SP scheduling group is empty, packets inthe WRR scheduling group are scheduled. Queues in the SP scheduling group are scheduled with theSP queue scheduling algorithm. Queues in the WRR scheduling group are scheduled with WRR.Congestion Management Configuration ApproachesComplete the following tasks to achieve congestion management:Task RemarksConfiguring SP Queuing OptionalConfiguring WRR Queuing OptionalConfiguring WFQ Queuing OptionalConfiguring SP+WRR Queuing OptionalConfiguring Congestion ManagementConfiguring SP QueuingConfiguration procedureFollow these steps to configure SP queuing: