User manual
30
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message of lower priority can send one by one, and the data may be lost because of shortage of
bandwidth. The ports always finish all messages of high priority queues first then allow the message of
lower priority queues
6.5.2 Port Priority
Default priority is based on port priority, default priority is different from COS and TOS, it did not have
relationship with data package, it had
relationship with switch port‟s priority. If the port‟s priority is higher,
the data packet will be transferred at first.
When open port priority, must open inspect COS. The example is as figure 6.5.2: open inspect port, 1,
2, 3, 4 COS, divide port 1, 2, 3, 4 in different priority, COS value corresponding priority no need to set up.
Port 1, 2, 3, 4, port 1, the
priority is the highest. When these 4 port „s receive data must transfer from other
port, because the limited of bandwidth, will be transferred according to priority queue mechanism
（
If use
strict mode, then
port 1‟s data must be transferred over at first. If use Weighted Fair 8:4:2:1, the 4 port will
be transferred according 8: 4: 2: 1 ratio
）
（
Figure 6.5.2
）
6.5.3 COS
802.1P defined 8 priorities
（
0-7
）
, corresponding 4 priority (High, Medium, Normal, Low)
The default setting of 0 priority identification equipment and priority identification 1 mapped to the
Low queue, priority queue is the worst. Identification of 2 priority and priority identification 3 mapped to the
Normal queue, priority identification 4 and priority identification 5 mapped to the Medium queue, priority
identification 6 and priority identification 7 mapped to the High queue is the highest priority queue.
