Qos Scheduling Mechanism - D-Link xStack DES-3800 Series User Manual

From/To A consecutive group of ports may be configured starting with the selected port.
Type This drop-down menu allows you to select between RX (receive), TX (transmit), and Both.
This setting will determine whether the bandwidth ceiling is applied to receiving,
transmitting, or both receiving and transmitting packets.
no_limit This drop-down menu allows you to specify that the selected port will have no bandwidth
limit. Enabled disables the limit.
Rate This field allows you to enter the data rate in Kbits per second that will be the limit for the
selected port. The value must be a multiple of 64 between 64 and 1000000.
Click Apply to set the bandwidth control for the selected ports. Results of configured Bandwidth
Settings will be displayed in the Port Bandwidth Table.

QoS Scheduling Mechanism

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 QoS folder, click QoS Scheduling Mechanism, to view the
window shown below.
The Scheduling Mechanism has the following parameters.
Parameter
Strict
Weight Robin
xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
Figure 9- 3. QoS Output Scheduling window
Description
The highest class of service is the first to process traffic. That is, the highest class of
service will finish before other queues empty.
Use the weighted round-robin (WRR) algorithm to handle packets in an even
distribution in priority classes of service
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