D-Link DIS-200G Emulator - Page 94

Quality of Service (QoS), 802.1p Priority

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DIS-200G Series Industrial Gigabit Ethernet Smart Managed Switch 7. Quality of Service (QoS) 802.1p Priority Port Rate Limiting Port Trust State 802.1p Priority This window is used to view and configure the port's scheduler method and default CoS settings. To view the following window, click QoS > 802.1p Priority, as shown below: Figure 7-1 802.1p Priority window The fields that can be configured in Port Scheduler Method are described below: Parameter From Port / To Port Scheduler Method Description Select the appropriate port range used for the configuration here. Select the scheduler method that will be applied to the specified port(s). Options to choose from are Strict Priority (SP) and Weighted Round-Robin (WRR). By default, the output queue scheduling algorithm is WRR. To set a CoS queue in the SP mode, any higher priority CoS queue must also be in the strict priority mode. WRR operates by transmitting permitted packets into the transmit queue in a round robin order. Initially, each queue sets its weight to a configurable weighting. Every time a packet from a higher priority CoS queue is sent, the corresponding weight is subtracted by 1 and the packet in the next lower CoS queue will be serviced. When the weight of a CoS queue reaches zero, the queue will not be serviced until its weight is replenished. When weights of all CoS queues reach 0, the weights get replenished at a time. 87

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DIS-200G Series Industrial Gigabit Ethernet Smart Managed Switch
87
7.
Quality of Service (QoS)
802.1p Priority
Port Rate Limiting
Port Trust State
802.1p Priority
This window is used to view and configure the port’s scheduler method and default CoS settings.
To view the following window, click
QoS > 802.1p Priority
, as shown below:
The fields that can be configured in
Port Scheduler Method
are described below:
Parameter
Description
From Port / To Port
Select the appropriate port range used for the configuration here.
Scheduler Method
Select the scheduler method that will be applied to the specified
port(s). Options to choose from are Strict Priority (
SP
) and
Weighted Round-Robin (
WRR
). By default, the output queue
scheduling algorithm is
WRR
.
To set a CoS queue in the
SP
mode, any higher priority CoS
queue must also be in the strict priority mode.
WRR
operates by transmitting permitted packets into the transmit
queue in a round robin order. Initially, each queue sets its weight
to a configurable weighting. Every time a packet from a higher
priority CoS queue is sent, the corresponding weight is subtracted
by 1 and the packet in the next lower CoS queue will be serviced.
When the weight of a CoS queue reaches zero, the queue will not
be serviced until its weight is replenished. When weights of all CoS
queues reach 0, the weights get replenished at a time.
Figure 7-1 802.1p Priority window