24 Port Fast Ethernet Web Management Switch User Manual
4.7. QOS
It contains three parts: priority mode, port, 802.1p, IP/DS based and TCP/UDP port based
4.7.1.
Priority mode
Figure 4-27
The priority mode includes three modes: fist-in-first-out, all-high-before-low and
weight-round-robin
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First-in-first-out (FIFO): traditional priority mode, which follow first-in-first-out rules,
bit enter from one side and out from the other side in the same order. It will be saved in
FIFO when the frame is received.
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All-high-before-low: absolute priority mode, which always transmits high priority
packets, if high priority has no packets, the low priority packets can be transmitted.
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Weight-round-robin (WRR): it is a scheduling discipline. The switch support 8 queue,
queues are serviced based on the weight. There are two options, one is low weight, from
1-8, the other is high weight, from 1-8
Note
:
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The "low weight" and "high weight" means the ratio of the packet in the transmit queue.
For example, if "low weight" and "high weight" are set to "3" and "5", the ratio of the
transmit packet for the low priority to high priority is 3/5
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The large the number is, the higher the priority is
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