D-Link DGS-3426P Product Manual - Page 231

xStack® DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch • 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 Q6 queue. For strict priority-based scheduling, any packets residing in the higher priority classes of service are transmitted first. Multiple strict priority classes of service are emptied based on their priority tags. Only when these classes are empty, are packets of lower priority transmitted. For weighted round-robin queuing, the number of packets sent from each priority queue depends upon the assigned weight. For a configuration of 8 CoS queues, A~H, with their respective weight value: 8~1. When each queue has 10 outbound packets, they are sent in the following sequence: A1, B1, C1, D1, E1, F1, G1, H1, A2, B2, C2, D2, E2, F2, G2, A3, B3, C3, D3, E3, F3, A4, B4, C4, D4, E4, A5, B5, C5, D5, A6, B6, C6, A7, B7, A8, A9, B8, C7, D6, E5, F4, G3, H2, A10, B9, C8, D7, E6, F5, G4 B10, C9, D8, E7, F6, C10, D9, E8, D10, E9, F7, G5, H3, E10, F8, G6, F9, F10, G7, H4, G8, G9, H5, G10, H6 ~ H10 For weighted round-robin queuing, if each CoS queue has the same weight value, then each CoS queue has an equal opportunity to send packets just like round-robin queuing. For weighted round-robin queuing, if the weight for a CoS is set to 0, then it will continue processing the packets from this CoS until there are no more packets for this CoS. The other CoS queues that have been given a nonzero value, and depending upon the weight, will follow a common weighted round-robin scheme. Remember that the xStack® DGS-3400 switch series has 7 configurable priority queues (and seven Classes of Service) for each port on the Switch. 222