TRENDnet TL2-FG142, Руководство пользователя

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TRENDnet User’s Guide
TL2-FG142
70
Items Description
Port This is the logical port number of this row.
Mode The port mode (default is Access) determines the fundamental behavior
of the port in question. A port can be in one of three modes as described
below.
Whenever a particular mode is selected, the remaining fields in that row
will be either grayed out or made changeable depending on the mode in
question.
Grayed out fields show the value that the port will get when the mode is
applied.
Access:
Access ports are normally used to connect to end stations. Dynamic
features like Voice VLAN may add the port to more VLANs behind the
scenes. Access ports have the following characteristics:
Member of exactly one VLAN, the Port VLAN (a.k.a. Access VLAN), which
by default is 1
Accepts untagged and C-tagged frames
Discards all frames that are not classified to the Access VLAN
On egress all frames classified to the Access VLAN are transmitted
untagged. Other (dynamically added VLANs) are transmitted tagged
Trunk:
Trunk ports can carry traffic on multiple VLANs simultaneously, and are
normally used to connect to other switches. Trunk ports have the
following characteristics:
By default, a trunk port is member of all VLANs (1-4095)
The VLANs that a trunk port is member of may be limited by the use of
Allowed VLANs
Frames classified to a VLAN that the port is not a member of are
discarded
By default, all frames but frames classified to the Port VLAN (a.k.a.
Native VLAN) get tagged on egress. Frames classified to the Port VLAN
do not get C-tagged on egress
Egress tagging can be changed to tag all frames, in which case only
tagged frames are accepted on ingress
Hybrid:
Hybrid ports resemble trunk ports in many ways, but adds additional
port configuration features. In addition to the characteristics described
for trunk ports, hybrid ports have these abilities:
Can be configured to be VLAN tag unaware, C-tag aware, S-tag aware, or
S-custom-tag aware
Ingress filtering can be controlled
Ingress acceptance of frames and configuration of egress tagging can be
configured independently
Port VLAN Determines the port's VLAN ID (a.k.a. PVID). Allowed VLANs are in the
range 1 through 4095, default being 1.
On ingress, frames get classified to the Port VLAN if the port is
configured as VLAN unaware, the frame is untagged, or VLAN awareness
is enabled on the port, but the frame is priority tagged (VLAN ID = 0).
On egress, frames classified to the Port VLAN do not get tagged if Egress
Tagging configuration is set to untag Port VLAN.
The Port VLAN is called an "Access VLAN" for ports in Access mode and
Native VLAN for ports in Trunk or Hybrid mode.
Port Type Ports in hybrid mode allow for changing the port type, that is, whether a
frame's VLAN tag is used to classify the frame on ingress to a particular
VLAN, and if so, which TPID it reacts on. Likewise, on egress, the Port
Type determines the TPID of the tag, if a tag is required.
Unaware:
On ingress, all frames, whether carrying a VLAN tag or not, get classified
to the Port VLAN, and possible tags are not removed on egress.
C-Port: