D-Link DES-3026 Reference Manual - Page 110
Weight Fair WRR, config scheduling_mechanism [strict | weight_fair]
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DES-3000 Series Layer 2 Switch CLI Reference Manual config scheduling_mechanism Purpose Used to configure the scheduling mechanism for the QoS function Syntax config scheduling_mechanism [strict | weight_fair] Description The config scheduling_mechanism command allows the user to select between a Weight Fair (WRR) and a Strict mechanism for emptying the priority classes of service of the QoS function. The Switch contains four hardware priority classes of service. Incoming packets must be mapped to one of these four hardware priority classes of service. This command is used to specify the rotation by which these four hardware priority classes of service are emptied. The Switch's default is to empty the four priority classes of service in order − from the highest priority class of service (queue 3) to the lowest priority class of service (queue 0). Each queue will transmit all of the packets in its buffer before allowing the next lower priority class of service to transmit its packets. Lower classes of service will be pre-empted from emptying its queue if a packet is received on a higher class of service. The packet that was received on the highest class of service will transmit its packet before allowing the lower class to resume clearing its queue. Parameters strict - Entering the strict parameter indicates that the highest class of service is the first to be processed. That is, the highest class of service should finish emptying before the others begin. Other classes of service will follow weight fair scheduling. weight_fair - Entering the weight fair parameter indicates that the priority classes of service will empty packets in a weighted roundrobin (WRR) order. That is to say that they will be emptied in an even distribution. Restrictions Only administrator-level users can issue this command. Example usage: To configure the traffic scheduling mechanism for each COS queue: DES-3026:4#config scheduling_mechanism strict Command: config scheduling_mechanism strict Success. DES-3026:4# 106