Tp-Link TL-SG1016DE V2 [39/49] Chapter 7 qos

Chapter 7 QoS

QoS (Quality of Service) functions to provide different quality of service for various network

applications and requirements and optimize the bandwidth resource distribution so as to

provide a network service experience of a better quality.

 QoS

This switch classifies the ingress packets, maps the packets to four different priority queues

and then forwards the packets according to WRR scheduling algorithms to implement QoS

function.

Figure 7-1 QoS Function

 Traffic classification: Identifies packets conforming to certain characters according to

certain rules.

 Map: This switch supports four priority queues. The priority queues are labeled as

1(Lowest), 2(Normal), 3(Medium) and 4(Highest), among them the bigger the value, the

higher the priority. The ingress packets are mapped to four different priority queues based

on the QoS modes. This switch implements three priority modes based on port, on 802.1P

and on DSCP.

 Queue scheduling algorithm: When the network is congested, the problem that many

packets compete for resources must be solved, usually in the way of queue scheduling. In

all QoS modes, this switch adopts WRR scheduling algorithm. In WRR scheduling algorithm,

packets in all the queues are sent in order based on the weight value for each queue and

every queue can be assured of a certain service time. The weight value indicates the

occupied proportion of the resource.