Administrator Guide

Allocating Bandwidth to Queue
Specifying WRED Drop Precedence
Conguring Policy-Based Rate Shaping
To congure policy-based rate shaping, use the following command.
• Congure rate shape egress trac.
QOS-POLICY-OUT mode
rate-shape
Allocating Bandwidth to Queue
The switch schedules packets for egress based on Decit Round Robin (DRR). This strategy oers a guaranteed data rate.
Allocate bandwidth to queues only in terms of percentage in 4-queue and 8-queue systems. The following table shows the default
bandwidth percentage for each queue.
The following table lists the default bandwidth weights for each queue, and their equivalent percentage which is derived by dividing the
bandwidth weight by the sum of all queue weights.
Table 61. Default Bandwidth Weights
Queue Default Bandwidth Percentage for 4–
Queue System
Default Bandwidth Percentage for 8–
Queue System
0 6.67% 1%
1 13.33% 2%
2 26.67% 3%
3 53.33% 4%
4 - 5%
5 - 10%
6 - 25%
7 - 50%
NOTE: The system supports 8 data queues.
NOTE: For multi-cast queue, 7th queue will be shared for both data and control packets.
When you assign a percentage to one queue, note that this change also aects the amount of bandwidth that is allocated to other queues.
Therefore, whenever you are allocating bandwidth to one queue, Dell EMC Networking recommends evaluating your bandwidth
requirements for all other queues as well.
• Assign each queue a bandwidth percentage ranging from 1 to 100%, in increments of 1%.
bandwidth-percentage
Specifying WRED Drop Precedence
You can congure the WRED drop precedence in an output QoS policy.
• Specify a WRED prole to yellow and/or green trac.
QOS-POLICY-OUT mode
wred
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Quality of Service (QoS)