DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual
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For strict priority-based scheduling, any packets residing in the higher priority queues are transmitted first. Multi ple
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 depen ds upon the assigned
weight. For a configuration of 8 CoS queues, A~H, with their respective weight value: 8~1. W hen 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 weigh t v al ue, then eac h 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 s et t o 0, t hen it w ill c ontinue pro cess ing the pack ets f rom
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 rou nd-robin scheme.
Remember that the DGS-3700 Series has eight priority queues (and eight Class es of Service) for each port on t he
Switch.