494 BigIron RX Series Configuration Guide53-1001986-01QoS for the oversubscribed 16 x 10GE modules18Setting the group port weightsThe command qos rcv-scheduler wfq 1 2 3 4 5 6 7 8 1 2 1 2 1 2 is used for Storage mode. Thismode uses weighting to determine the queue scheduling. The network ports are still assigned highlow and low high queues but are scheduled based on the weights assigned.Setting the averaging-fair-weight (wfq) parameterThe wfq parameter is configured as the averaging-fair-weight parameter. In this implementation,you can set one of 13 (1 - 13) possible values. These values represent a wfg value as described inTable 97Calculating the values for WFQ storage mode trafficschedulingWeighted Fair Queueing (WFQ) scheduling is configured to be a percentage of available bandwidthusing the following formula.w (x)Weight of w (x) = -----------------------------------------w0 + w1 + w2 + w3 + w4 + w5 + w6 + w7Where.w (x) = The value of the queue that you want to determine the weight for. It can be the value of anyweight (0 - 7).w0 - w7 = the assigned values of the eight weights.Weight of w (x) = the calculated weight as a percentage of the port's total bandwidth.For example if you assign the following values to weight 0 to 7.BigIron RX(config-if-e10000-4/1)#qos rcv-scheduler wfq 1 5 1 5 1 5 1 5Weight 0 = 1, Weight 1 = 5, Weight 2 = 1, Weight 3 = 5, Weight 4 = 1, Weight 5 = 5, Weight 6 = 1,and Weight 7 = 5To determine the weight of w3.5Weight of w3 = -----------------------------------------1 + 5 + 1 + 5 +1 + 5 + 1 + 5The weight of w3 is 20.8%. Consequently, w3 (Port 2 High Priority) will get 20.83% of the groupport's total bandwidth if equal amounts of traffic are received from all eight weights.12 4 0 0 or 4 High priority TC DP0 (Network control)13 5 0 1 or 5 High priority TC DP0 (Network control)14 6 0 2 or 6 High priority TC DP0 (Network control)15 7 0 3 or 7 High priority TC DP0 (Network control)TABLE 96 QOS profile table (Continued)
