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transmitted in the spare time.

The shortage of PQ is: when there is network congestion, there are more packets in superior

group for a long time, the packets in inferior priority will wait longer.

(2) WRR

WRR queue scheduler divides a port into 4 or 8 outputting queues (S2926V-O has 4 queues,

that is, 3, 2, 1, 0) and each scheduler is in turn to guarantee the service time for each queue.

WRR can configure a weighted value (that is, w3, w2, w1, w0 in turn) which means the

percentage of obtaining the resources. For example: There is a port of 100M. Configure its

WRR queue scheduler value to be 50, 30, 10, 10 (corresponding w3, w2, w1, w0 in turn) to

guarantee the inferior priority queue to gain at least 10Mbit/s bandwidth, to avoid the shartage

of PQ queue scheduler in which packets may not gain the service.

WRR possesses another advantage. The scheduler of many queues is in turn, but the time for

service is not fixed——if some queue is free, it will change to the next queue scheduler to

make full use of bandwidth resources.

(3) WRR with maximum delay

Compared with WRR, WRR with maximum delay can guarantee the maximum time from

packets entering superior queue to leaving it will not beyond the configured maximum delay.

11. The cos-map relationship of hardware priority queue and priority of IEEE802.1p protocol

System will map between 802.1p protocol priority of packet and hardware queue priority. For

each packet, system will map it to specified hardware queue priority according to 802.1p

protocol priority of packet.

12. Flow mirror

Flow mirror means coping specified data packet to monitor interface to detect network and

exclude failure.

13. Statistics based on flow

Statistics based on flow can statistic and analyse the packets customer interested in.

14. Copy packet to CPU

User can copy specified packet to CPU according to the need of its QoS strategies.

System realizes QoS function according to accessing control list, which includes: flow monitor,

interface speed limit, packet redirection, priority mark, queue scheduler, flow mirror, flow

statistics and coping packet to CPU.