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Ethernet Switch CLI Reference Guide
185
CHAPTER 50
Queuing Commands
Use queuing commands to help solve performance degradation when there is network
congestion.
" Queuing method configuration differs across Switch models.
• Some models allow you to select a queuing method on a port-by-port basis. For example,
port 1 can use Strictly Priority Queuing and ports 2-8 can use Weighted Round Robin.
• Other models allow you to specify one queuing method for all the ports at once.
50.1 Queuing Overview
The following queuing algorithms are supported by ZyXEL Switchyes:
" Check your User’s Guide for queuing algorithms supported by your model.
• 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.
" Switch models which have only 4 queues, support a limited version of SPQ.
The highest level queue is serviced using SPQ and the remaining queues use
WRR queuing.