АМАТЕК AN-SGM28P24-400 [101/322] Qos based on cos

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forward.。WFQ and WRR queue scheduling algorithm is similar, in the weight algorithm support

byte-count and weight, also support SP packet, can replace each other. The difference is as follows:

WRR supports a maximum delay, can guarantee the maximum delay of the configuration message

in the queue from entering the queue to the maximum time to leave the queue does not exceed the

set; WFQ supports guaranteed bandwidth, minimum queue bandwidth can guarantee the port

traffic congestion when available。

In order to facilitate user configuration, we introduce the concept of QosProfile。QosProfile is

an attribute of the mapping relationship configured with 802.1p and priority queues, which cannot

be configured by the user。Their mapping relationships are as follows:

QosProfile

802.1p(CoS)

priority queuing

Qp0

Qp1

Qp2

Qp3

Qp4

Qp5

Qp6

Qp7

7.1.1 QoS based on COS

The port is enabled by default based on COS QoS. The exchange opportunity obtains the

priority value of the VLAN TAG in the packet entering the port, and determines the output queue

of the packet according to the mapping relationship between the user configured COS value and

the queue。If the data packet is not VLAN TAG or VLAN TAG VID is 0, then the switch will

according to the user configuration of the port and the port of the VID default default priority fill

the data package, and then according to the output queue of the packet determines the default

priority。

7.1.2QoS based on DSCP

If a port is enabled DSCP based on QoS, then exchange the opportunity to acquire IP data

packets into the port of the DSCP values in the output queue and decide the packet according to