Vigitron MaxiiNet Vi30018, Operational Manual

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For 802.1p priority tag, the following table is used to map the 802.1p field
to the priory queue.
Priory Field Priority Queue
4,5,6,7 High
0,1,2,3 Low
Class of Service Configuration (CoS)
Define CoS:

TCP or UDP- port number

IP TOS/DS

802.1p Priority Tag

802.1p Physical Tag

Select the require tag(s) and update.
The administrator can select the protocol that will be forwarded as the
specified mode. There are 3 administrator-defined UDP/TCP port
groups and many well-known TCP/UDP ports. The administrator-
defined port number may be a range or a specific number, depending
on the mask.
The operating theory for all 4 CoS types can be illustrated by the
following figure and table: