ZyXEL Communications VMG5313-B10A/ VMG5313-B30A User Manual

Chapter 10 Quality of Service (QoS)

VMG5313-B10A/-B30A Series User’s Guide

Use this screen to add, edit or delete QoS classifiers. A classifier groups traffic into data flows 
according to specific criteria such as the source address, destination address, source port number, 
destination port number or incoming interface. For example, you can configure a classifier to select 
traffic from the same protocol port (such as Telnet) to form a flow.

You can give different priorities to traffic that the VMG forwards out through the WAN interface. 
Give high priority to voice and video to make them run more smoothly. Similarly, give low priority 
to many large file downloads so that they do not reduce the quality of other applications. 

Click Network Setting > QoS > Class Setup to open the following screen.

Priority

Select the priority level (from 1 to 7) of this queue.

The smaller the number, the higher the priority level. Traffic assigned to higher priority 
queues gets through faster while traffic in lower priority queues is dropped if the network is 
congested.

Weight

Select the weight (from 1 to 8) of this queue. 

If two queues have the same priority level, the VMG divides the bandwidth across the 
queues according to their weights. Queues with larger weights get more bandwidth than 
queues with smaller weights.

Buffer 
Management

This field displays Drop Tail (DT). Drop Tail (DT) is a simple queue management 
algorithm that allows the VMG buffer to accept as many packets as it can until it is full. Once 
the buffer is full, new packets that arrive are dropped until there is space in the buffer again 
(packets are transmitted out of it). 

Rate Limit

Specify the maximum transmission rate (in Kbps) allowed for traffic on this queue.

OK

Click OK to save your changes.

Cancel

Click Cancel to exit this screen without saving.

Queue Setup: Add (continued)