Intellinet 560665, Руководство пользователя

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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.
Priority Mode
There are three priority modes available to specify the priority of packets being
serviced. Those include First-In-First-Out, All-High-Before-Low, and
Weight-Round-Robin.
Figure 4-1

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.

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.