D-Link DGS-3700 user manual

DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual

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. 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 DGS-3700 Series has eight priority queues (and eight Classes of Service) for each port on the Switch.

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