АМАТЕК AN-SGM28P24-400 [100/322] Qos introduce

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7.1 QoS introduce

Using the QoS function of the switch, you can make the important data stream forwarded by

the switch get priority processing, make your network bandwidth utilization more reasonable,

network performance become predictable。

In the packet is determined at the input end according to the priority information of the

packet。

The switch implements QoS based on COS (802.1p), QoS based on DSCP (DiffServ) and

QoS based on MAC. A DSCP based QoS can be configured on a physical port; the physical port

defaults to start the QoS based COS。

The following is a QoS enabled packet forwarding flow：

Switches support 0~7 eight priority queues, queue 7 has the highest priority, and queue 0 has

the lowest priority. There are three kinds of priority queue scheduling methods: SP, WRR, WFQ。

SP is the strict priority scheduling, the priority queue is always forwarding 7 data packets, until the

queue 7 packets forwarding is completed, began to queue 6 queue 6 packets, packet forwarding is

completed before forwarding queue 5 packets, the packet forwarding queue 0. WRR is a weighted

priority polling switch in forwarding packets, according to the distribution of the rights of the high

priority queue to low priority queue polling packet forwarding, forwarding number first right from

the high priority data packet forwarding in the right time the number of data packets with high

priority and low priority queue forward until the end. From the high priority class began to push