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The Passport 1600 Series switch contains 4 hardware priority queues. Three of these queues use Deficit Weighted Round Robin (DWRR), while the fourth uses Strict Priority (SP). Incoming packets are mapped to one of these four queues. By default, the weight is assigned evenly for all DWRR ports.
To configure port scheduling:
| The ACL dialog box opens with the Template Mode tab displayed. |
| The Port Scheduling tab opens. |
You can change the weight of the Traffic Classes to any value between 6-255, thus specifying the maximum number of packets a given hardware priority queue can transmit before allowing the next lowest hardware priority queue to begin transmitting its packets.
For example, if you specify a value of 3, the highest hardware priority queue (number 3) is allowed to transmit 3 packets. Then, the next lowest hardware priority queue (number 2) is allowed to transmit 3 packets and so on until all of the queues have transmitted 3 packets. This process then repeats itself.
The table that follows describes the Port Scheduling dialog box fields.
PortIndex
Specifies the logical port index.
ClassId
Specifies which of the four hardware priority queues to use. The four hardware priority queues are identified by number, from 0 to 3, with the 0 queue being the lowest priority.
WRRValue
Specifies the weighted round robin (WRR) that the previously- specified hardware priority queue is allowed to transmit before allowing the next lowest priority queue to transmit its packets. The range here is from 6-255.
| The ACL, Port Scheduling- Filter dialog box appears and allows you to choose the display criteria. |
| The table that follows describes this dialog box. |
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