ZyXEL GS1500-24P User Guide - Page 87
Packet Scheduling
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Chapter 10 QoS Table 24 Configuration > QoS > Priority to Queue Mapping (continued) LABEL DESCRIPTION 1 This is typically used for non-critical "background" traffic such as bulk transfers that are allowed but that should not affect other applications and users. 2 This is for "spare bandwidth". 3 Typically used for "excellent effort" or better than best effort and would include important business traffic that can tolerate some delay. 4 Typically used for controlled load, latency-sensitive traffic such as SNA (Systems Network Architecture) transactions. 5 Typically used for video that consumes high bandwidth and is sensitive to jitter. 6 Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations in delay). 7 Typically used for network control traffic such as router configuration messages. Queue ID Select the Queue ID for which the Priority should be applied. Apply Click Apply to save your changes to the Switch. Priority This field displays the priority for each Queue ID. Queue ID This field displays the Queue ID. 10.8 Packet Scheduling Packet Scheduling is used to help solve performance degradation when there is network congestion. Use this screen to configure queuing algorithms for outgoing traffic. See also Priority to Queue Mapping (Chapter 10 on page 86) for related information. 10.8.1 Strictly Priority Queuing Strictly Priority Queuing (SPQ) services queues based on priority only. As traffic comes into the Switch, traffic on the highest priority queue, Q7 is transmitted first. When that queue empties, traffic on the next highest-priority queue, Q6 is transmitted until Q6 empties, and then traffic is transmitted on Q5 and so on. If higher priority queues never empty, then traffic on lower priority queues never gets sent. SP does not automatically adapt to changing network requirements. 10.8.2 Weighted Fair Queuing Weighted Fair Queuing is used to guarantee each queue's minimum bandwidth based on its bandwidth weight (portion) (the number you configure in the Weight field) when there is traffic congestion. WFQ is activated only when a port has more GS1500-24P User's Guide 87