D-Link DES-3528P [87/260] Scheduling

DES-3550 Fast Ethernet Layer 2 Switch

Scheduling

QoS can be customized by changing the output scheduling used for the hardware queues in the Switch. 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- 44. QoS Output Scheduling window

You may assign the following values to the QoS classes to set the scheduling.

Parameter Description

Max. Packets (0-255)

Specifies the maximum number of packets the above specified hardware priority

queue will be allowed to transmit before allowing the next lowest priority queue to

transmit its packets. A value between 0 and 255 can be specified.

Max. Latency (0-255)

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.