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User Manual    
Publication date: July, 2006 
Revision A2 
52 
 
3-8. QoS 
 
Function name: 
        QoS Setting 
Function description: 
The switch offers powerful QoS function. This function supports 802.1p 
(Influence the packets with tag or not and when the packets have no tag, the 
packets will be added tag according to your Default Priority of Port 
Configuration for tagged priority field), VLAN-tagged priority, can make 
precedence of 8 priorities and Port-based (VIP port) QoS service. In VLAN-
tagged mode, there are 3 bits belonging to this priority in the vlan tagged field. 
According to these 3 bits, we could arrange 8 traffic priority (0~7) and 
randomly place them into one of 4 Queues that the switch offers. However, 
These 4 Queues have different QoS order according to your setting of QoS 
Scheduling Method. At present, the switch supports 2 kinds of QoS Scheduling 
Method; the one is Weighted Round Robin, the other is Strict Priority. If we had 
chosen “Weighted Round Robin” as our Scheduling Method, each Queue will 
achieve QoS effect based on its different ratio of bandwidth in Weight. About 
VIP Port, when some ports belong to VIP Port, the packets enter VIP port and 
they will run in Queue 3 Priority followed by your assigning Weight. But while 
you choose Strict Priority Scheduling Method and assign some ports as VIP 
Port, VIP port will own the highest priority and get the largest bandwidth 
regardless of Queue Priority when the congestion of the network happens. 
Parameter description: 
Scheduling Method:  
Two scheduling methods are offered for QoS, one is Weighted Round 
Robin, and the other is Strict Priority. The former will decide the 
bandwidth that each Queue will occupy based on the ratio of Weight; the 
latter will decide which port owns the highest priority in transmission 
according to if the VIP port is enabled or not. Default scheduling method 
is Weighted Round Robin.  
Priority:  
8 kinds of priorities, including 0, 1, 2, 3, 4, 5, 6 and 7. 
Queue 0 (Low): 
Any priority can be placed into Queue 0. Default priorities are 0 and 1.  
Press  <Apply>  button to have the setting taken effect after completing 
the setting. 
Queue 1: 
Any priority can be placed into Queue 1. Default priorities are 2 and 3.  
Press  <Apply>  button to have the setting taken effect after completing 
the setting.