Tp-Link TL-SG108PE [40/48] Chapter 8 qos

Chapter 8 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 different priority queues and then

forwards the packets according to weighted round robin (WRR) scheduling algorithm to implement

QoS function.

Figure 8-1 QoS function

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

rules.

 Map: The user can map the ingress packets to different priority queues based on the priority

modes. This switch implements three QoS modes based on port /802.1P /DSCP.

 WRR-Mode: Weight Round Robin Mode. In this mode, 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. In WRR

mode, though the queues are scheduled in order, the service time for each queue is not fixed,

that is to say, if a queue is empty, the next queue will be scheduled. In this way, the bandwidth

resources are made full use of. The default weight value ratio of TC1, TC2, TC3 and TC4 is

1:2:4:8.

 QoS Mode

This switch implements three QoS modes based on port /802.1P /DSCP. By default, the QoS mode

based on port is enabled and the others are optional.

1. Port Based

When port-base QoS mode is enabled, the user can manually map the ingress packets of the port

to four different priority queues. After that, the switch will preferentially send packets in the queue