Specifications

CLI Management Guide
TigerAccess™ EE
198 SMC7824M/VSW
7.6.9 Scheduling Algorithm
For the switch, it is possible to use Strict Priority Queuing and Deficit Weighted Round
Robin for a packet scheduling mode.
The following sections explain how QoS can be configured:
•
Scheduling Mode
•
Weight
•
Maximum and Minimum Bandwidth
•
Maximum Buffer numbers
•
Queue Status
•
Displaying QoS
•
Weighted Random Early Detection (WRED)
To process incoming packets by the queue scheduler, the switch provides the scheduling
algorithm as Strict Priority Queuing (SP) and Deficit Weighted Round Robin (DWRR).
Strict Priority Queuing (SP)
SPQ processes first more important data than the others. Since all data are processed by
their priority, data with high priority can be processed fast but data without low priority
might be delayed and piled up. This method has a strong point of providing the distin-
guished service with a simple way. However, if the packets having higher priority enter,
the packets having lower priority are not processed.
3
7
6
7
741
The processing order in Strict Priority Queuing in case of entering
packets having the Queue numbers as below
3
3
4
7
Output Scheduler
Lowest priority highest priority
7 7 776443 3 31
Fig. 7.11 Strict Priority Queuing