D-Link DES-3526DC Product Manual - Page 87
Scheduling, QoS Output Scheduling window, Parameter, Description, Max. Packets 0-255
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xStack DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual Scheduling Changing the output scheduling used for the hardware queues in the Switch can customize QoS. As with any changes to QoS implementation, careful consideration should be given to how network traffic in lower priority queues is affected. Changes in scheduling may result in unacceptable levels of packet loss or significant transmission delay. If you choose to customize this setting, it is important to monitor network performance, especially during peak demand, as bottlenecks can quickly develop if the QoS settings are not suitable. In the Configuration folder open the QoS folder and click QoS Output Scheduling, to view the window shown below. Figure 6- 48. QoS Output Scheduling window You may assign the following values to the QoS classes to set the scheduling. Parameter Description Max. Packets (0-255) Max. Latency (0-255) Specifies the maximum number of packets the above specified hardware priority queue would be allowed to transmit before allowing the next lowest priority queue to transmit its packets. A value between 0 and 255 can be specified. Specifies the maximum amount of time the above specified hardware priority queue will be allowed to transmit packets before allowing the next lowest hardware priority queue to begin transmitting its packets. A value between 0 and 255 can be specified - with this value multiplied by 16 ms to arrive at the total allowed time for the queue to transmit packets. For example, a value of 3 specifies 3 X 16 = 48 ms. The queue will continue transmitting the last packet until it is finished when the max latency timer expires. Click Apply to implement changes made. NOTE: The settings you assign to the queues, numbers 0-7, represent the IEEE 802.1p priority tag number. Do not confuse these settings with port numbers. 73