UP-308FEW / UP-316FEW
QoS Setting
Here you can configure QoS priority mode and CoS (Class of Service). 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 low-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 (Strict Priority)
and
4 Queue
Weighted Round Robin
.
•
First-In-First-Out:
Packets are queued 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 in the low priority queue will
not be forwarded until the high priority queue is empty.
•
4 Queue WRR:
There are 4 priority queues for Weighted-Round-Robin (WRR) mode.
Q3 and Q4 are Low-weight queues (weight range: 0~8), Q1 and Q2 are High-weight
queues (weight range: 0~8).
In this mode, the switch will forward a specified number of high priority packets and then a
specified number of low priority packets. The switch repeats this cycle continuously.
Terms "low weight" and "high weight" mean the ratio of the packet in the transmit queue.
For example, if "low weight" and "high weight" are set to "3" and "5", the ratio of the
transmit packet for the low priority to high priority is 3/5.
When the queue weight is set to
0
, it will be treated as
8
.
User Manual 31
