Chapter 8 Qos - TP-Link TL-SG105E User Manual

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.
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

Chapter 8 QoS

Figure 8-1 QoS function
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