Choose Policies→QoS→SROS QoS→Slope→WRED Slope from the NFM-P main menu. The WRED Slope Policies form opens.

Click Create, or choose a policy in the list and click Properties. The WRED Slope Policy (Create|Edit) form opens.

Configure the required general parameters.

When packets are queued, shared buffer average utilization is calculated using the Time Average Factor for the buffer pool. The time average factor specifies the weighting between the previous shared buffer average utilization result and the new shared buffer utilization to determine the new shared buffer average utilization.

Note: The Time Average Factor parameter must be set to 3 on the 7705 SAR.

Click on the Burst Size tab. The Burst Size form opens, as shown in Figure 50-4, Slope policy form - Burst Size .

Figure 50-4: Slope policy form - Burst Size

Each buffer pool supports a high-priority RED High Slope, a low-priority RED Low Slope, an Exceed Slope, and a HighPlus Slope. The High Slope manages access to the shared portion of the buffer pool for high-priority or in-profile packets. The Low Slope manages access to the shared portion of the buffer pool for low-priority or out-of-profile packets. The Exceed Slope handles the exceeded profile traffic congestion control at the pool and megapool level. The values for the Exceed Slope parameters should be set so that they are lower than the Low Slope in the slope hierarchy, as shown in the example above, specifically, Start Avg=30, Max Avg=55, and Max Prob=80. Finally, the HighPlus Slope handles the inplus profile traffic congestion control. A HighPlus Slope policy can be applied to pool-per-queue queues in an egress queue group template, which in turn can be applied at a network egress port. The HighPlus Slope is also supported in a slope policy applied to the egress WRED megapool. The values for the HighPlus Slope parameters should be set so that they are higher than the High Slope in the slope hierarchy, as shown in the example above, specifically, Start Avg=85, Max Avg=100, and Max Prob=80. See  Slope policies in this chapter for more information.

Configure the parameters for the Exceed Slope, Low Slope, High Slope, and the HighPlus Slope.

Click OK to save the policy and close the form, or click Apply to save the policy. See To release and distribute a policy to distribute the policy to NEs.

End of steps