D-Link DES-3828 Product Manual - Page 98

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch CLI Manual 13 QOS COMMANDS The xStack DES-3800 Series supports 802.1p priority queuing. The Switch has 8 priority queues. These priority queues are numbered from 7 (Class 7) - the highest priority queue - to 0 (Class 0) - the lowest priority queue. The eight priority tags specified in IEEE 802.1p (p0 to p7) are mapped to the Switch's priority queues as follows: • Priority 0 is assigned to the Switch's Q2 queue. • Priority 1 is assigned to the Switch's Q0 queue. • Priority 2 is assigned to the Switch's Q1 queue. • Priority 3 is assigned to the Switch's Q3 queue. • Priority 4 is assigned to the Switch's Q4 queue. • Priority 5 is assigned to the Switch's Q5 queue. • Priority 6 is assigned to the Switch's Q6 queue. • Priority 7 is assigned to the Switch's Q7 queue. Priority scheduling is implemented by the priority queues stated above. The Switch will empty the eight hardware priority queues in order, beginning with the highest priority queue, 7, to the lowest priority queue, 0. Each hardware queue will transmit all of the packets in its buffer before permitting the next lower priority to transmit its packets. When the lowest hardware priority queue has finished transmitting all of its packets, the highest hardware priority queue will begin transmitting any packets it may have received. The commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the following table. Command Parameters config bandwidth_control {rx_rate [ no_limit | ] | tx_rate [ no_limit | ]} show bandwidth_control {} config scheduling max_packet config [strict(1) | weight_robin (2)] scheduling_mechanism show scheduling show scheduling_mechanism config 802.1p user_priority show 802.p user_priority config 802.1p default_priority | all ] show 802.1p default_priority { } 94