D-Link DGS-3612G Product Manual - Page 313

xStack® DGS-3600 Series Layer 3 Managed Gigabit Ethernet Switch the Switch. Then in turn, the administrator will set a priority for this queue so that will be emptied before any other packet is forwarded. This results in the end user receiving all packets sent as quickly as possible, thus prioritizing the queue and allowing for an uninterrupted stream of packets, which optimizes the use of bandwidth available for the video conference. Understanding QoS The Switch has eight priority queues, one of which is internal and unconfigurable. These priority queues are labeled as 6, the high queue to 0, the lowest queue. The eight priority tags, specified in IEEE 802.1p are mapped to the Switch's priority tags 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 Q6 queue. For strict priority-based scheduling, any packets residing in the higher priority queues are transmitted first. Multiple strict priority queues empty based on their priority tags. Only when these queues 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, the packets 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, A1, B1, C1, D1, E1, F1, G1, H1. 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 Switch has seven configurable priority queues (and seven Classes of Service) for each port on the Switch. NOTICE: The Switch contains eight classes of service for each port on the Switch. One of these classes is reserved for internal use on the Switch and therefore is not configurable. All references in the following section regarding classes of service will refer to only the seven classes of service that may be used and configured by the Switch's Administrator. 297