Before You Begin - ZyXEL Communications FSG2200HNU User Manual

• Strictly Priority services queues (Q1 to Q4) based on priority only.
Figure 15 Egress Queue: Strictly Priority
In the figure above as traffic comes into the ZyXEL Device, traffic on the highest
priority queue, Q1, is transmitted first. When that queue empties, traffic on the
next highest-priority queue Q2 is transmitted until it empties, and then traffic is
transmitted on Q3 and so on. If higher priority queues never empty, then traffic
on lower priority queues never gets sent. Strictly Priority does not automatically
adapt to changing network requirements.
• Weighted Fair Queuing is used to guarantee each queue's minimum
bandwidth based on its bandwidth weight (the number you select in the WFQ
(Weighted Fair Queue) field) when there is traffic congestion. This queuing
mechanism is highly efficient in that it divides any available bandwidth across
the different traffic queues. You can specify the bandwidth in the Shaping Rate
field. WFQ is activated only when a port has more traffic than it can handle.
Figure 16 Egress Queue: Weighted Fair Queuing
In the figure above, the queue with the larger weight (10) get more guaranteed
bandwidth than queues with smaller weights.
Note: The egress queue for the default WAN interface is Strictly Priority.
Finding Out More
• See Section 5.5 on page 89
• See Chapter 3 on page 37

5.1.3 Before You Begin

You need to know your Internet access settings such as encapsulation and WAN IP
address. Get this information from your ISP.
FSG2200HNU User's Guide
for advanced technical information on WAN.
for WAN tutorials.
Chapter 5 WAN Setup
75