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CHAPTER 7: QOS APPLICATION
Quality of Service (QoS) features allow you to allocate network resources to mission-critical applications at the expense
of applications that are less sensitive to such factors as time delays or network congestion. You can configure your network
to prioritize specific types of traffic, ensuring that each type receives the appropriate Quality of Service (QoS) level.
7.1 SP/SPWRR
The switch can be configured to have 8 output Class of Service (CoS) queues (Q0–Q7) per port, into which each packet is placed.
Q0 is the highest priority Queue. Each packet’s 802.1p priority determines its CoS queue. The user needs to bind VLAN priority/
queue mapping profile to each port, and for every VLAN priority the user needs to assign a traffic descriptor for it. The traffic
descriptor defines the shape parameter on every VLAN priority for the Ethernet interface. Currently the switch supports Strict
Priority and SP+WRR (Weighted Round Robin) scheduling methods on each port.
TABLE 7-1. DEFAULT PRIORITY AND QUEUE MAPPING VALUES
PRIORITY0 PRIORITY1 PRIORITY2 PRIORITY3 PRIORITY4 PRIORITY5 PRIORITY6 PRIORITY7
Queue0 Queue1 Queue2 Queue3 Queue4 Queue5 Queue6 Queue7
SPQ SPQ SPQ SPQ SPQ SPQ SPQ SPQ
Application Examples
Following we provide several examples for various QoS combinations. You can configure QoS using the Web-based management
system, CLI (Command Line Interface) or SNMP.
7.2 EXAMPLE 1: SPQ WITHOUT SHAPING (DEFAULT PROFILE)
We send 2 Streams (Stream0, Stream1) from PORT-1 to PORT-2. Both Streams each have 100 Mbps. Stream0 includes VLAN
Priority0, Stream1 includes VLAN Priority7. Set PORT-2 link speed to 100 Mbps.
Expected Result:
We expect that PORT-2 only can receive 100 Mbps of Stream1, and Stream0 will be discarded. This explains how SPQ works on the
switch.
P0
P7
P6
P5
P4
P3
P2
P1
Q0 (lowest queue)
Q7 (highest queue)
Q6
Q5
Q4
Q3
Q2
Q1
P2: 100 Mbps
P1: 100 Mbps
FIGURE 7-1. GIGABIT PORT VLAN PRIORITY & QUEUE MAPPING.
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