Maipu S2000-8/16 10/100Mbps Ethernet Switch, User Manual

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Chapter 6 QoS Configuration
6.1
Priority Mode
Priority mode includes:
1. FIFO (First-in first-out)
When queue scheduling, switch will handle packet with time order (the default mode) .
2. PQ (Strict-Priority Queue
When queue scheduling, PQ precedently transmits the packets in superior priority
according to the priority level. Transmit packet in inferior priority when the superior one is
empty. Put the key service in the superior one, and non-key service (such as email) in
inferior one to guarantee the packets in superior group can be first transmitted and
non-key service can be transmitted in the spare time.
3. WRR (Weighted Round Robin)
WRR queue scheduler divides a port into 4 outputting queues that is Q1, Q2, Q3, Q4 and
each scheduler is in turn to guarantee the service time for each queue. WRR can
configure a weighted value (that is, Q1, Q2, Q3, Q4 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 Q1, Q2, Q3, Q4 in turn) to
guarantee the inferior priority queue to gain at least 10Mbit/s bandwidth, to avoid the
shortage of PQ queue scheduler in which packets may not gain the service.