Qos Setting; Priority Mode - EverFocus ES0812-31 User Manual

4.6 QoS Setting

Here you can configure QoS policy priority mode and CoS (Class of Service)
configuration. QoS (Quality of Service) refers to mechanisms in the network
software that make the actual determination of which packets have priority. CoS
refers to feature sets, or groups of services, that are assigned to users based on
company policy. If a feature set includes priority transmission, then CoS winds up
being implemented in QoS functions within the routers and switches in the
network. In an enterprise network, class of service (CoS) differentiates
high-priority traffic from lower-priority traffic. Tags may be added to the packets
to identify such classes, but they do not guarantee delivery as do quality of service
(QoS) functions, which are implemented in the network devices.

4.6.1 Priority Mode

There are three priority modes available to specify the priority of packets being
serviced. Those
Weight-Round-Robin.
 First-In-First-Out: Packets are placed into the queue and serviced in the order
they were received.
 All-high-before-low(Strict priority)：All packets will be assigned to either high
priority queue (Queue 2) or low priority queue (Queue 1). The packet on the low
priority queue will not be forwarded until the high priority queue is empty.
 Weight-Round-Robin (WRR) mode: There are 4 priority queues for
Weighted-and-round-robin (WRR) mode. When this mode is selected, the traffic
will be forwarded according to the number set in each queue.
include First-In-First-Out,
Figure 6-1
32
PoE Switch
All-High-Before-Low, and