Dell S4048–ON Configuration Manual page 686

Setting a dot1p Value for Egress Packets
To set a dot1p value for egress packets, use the following command.
• Set a dscp or dot1p value for egress packets.
QOS-POLICY-IN mode
set mac-dot1p
Creating an Output QoS Policy
To create an output QoS policy, use the following commands.
1. Create an output QoS policy.
CONFIGURATION mode
qos-policy-output
2. After you configure an output QoS policy, do one or more of the following:
Scheduler Strict — Policy-based Strict-priority Queueing configuration is done through scheduler strict. It is applied to Qos-
policy-output. When scheduler strict is applied to multiple Queues, high queue number takes precedence.
Allocating Bandwidth to Queue
Specifying WRED Drop Precedence
Configuring Policy-Based Rate Shaping
To configure policy-based rate shaping, use the following command.
• Configure rate shape egress traffic.
QOS-POLICY-OUT mode
rate-shape
Allocating Bandwidth to Queue
The switch schedules packets for egress based on Deficit Round Robin (DRR). This strategy offers 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 71. Default Bandwidth Weights
Queue
0
1
2
3
4
5
6
7
NOTE: In Dell Networking OS we support 8 data queues in S4048, S6000, Z9500 and 4 data queues in S3048, S4810.
S4820T and, S5000.
686
Quality of Service (QoS)
Default Bandwidth Percentage for 4–
Queue System
6.67%
13.33%
26.67%
53.33%
-
-
-
-
Default Bandwidth Percentage for 8–
Queue System
1%
2%
3%
4%
5%
10%
25%
50%