Eneo IAR-7SH1024MMA, Руководство пользователя

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6.3
VLAN forwarding rules Introduction:

The following is the definition of a variety of port types on a variety of data frame
processing methods;
Tagged data
frame
IN
Tagged data
frame
OUT
Untagged data
frame
IN
Untagged data
frame
OUT
Tagged Port
Receive as it is
Hit PVID tag tag
Send as it is
Hit Tag as port
PVID
Hit Tag as PVID
Untagged Port discard Remove tag
Hit Tag as port
PVID
Send as it is

The so-called Untagged Port and Tagged Port do not state the status of a physical port,
but the status of a certain VID owned by a physical port. Therefore, a physical port can
be a Untagged Port on one VID and a Tagged on another VID Port;

A physical port can only have one PVID. When a physical port has a PVID, it must have
the same VID as the PVID's TAG. On this VID, the physical port must be a Untagged Port.

The role of PVID is only when the switch receives a Untagged data frame from the
outside to add a TAG tag to the data frame. When the data is forwarded inside the
switch, the PVID does not play any role.

A physical port that has a VID that is consistent with the TAG tag can accept tagged
data frames marked with this TAG tag from inside the switch, regardless of whether the
VID is a Untagged Port or a Tagged Port.