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6.5 QOS
6.5.1 QOS Classification
QoS provides four internal queues, each queue supports four different levels of traffic, shorter
persistence time of high-priority data packets in the switch, supports lower latency for certain
delay-sensitive traffic. According to 802.1p priority tags and IP TOS, equipment can be able to put the
packets to an appropriate level.
(Figure 6.5.1)
Users can select the QOS priority queue mechanism, the queue mechanism in two ways: weighted Fair
mode and strict mode.
6.5.1.1 Weighted Fair priority
Weighted Fair refers to this port sends message according to queue priority High, Medium, Normal
and low in proportion of 8:4:2:1 when some ports traffic is heavy. If sending speed is less than bandwidth,
the message of each priority queues can send normally; if the port keeps sending in full speed, then the
rest of the message of each priority queues will be discarded.
6.5.1.2 Strict priority
Strict priority: it refers to QoS deals with the message from high priority to low priority. If the low
priority queues is full but the message of high priority queues don‟t finish, the message of low priority
queues will be discarded; but if the speed of high priority queue does not reac
h the port‟s wire speed, then
