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TRENDnet User’s Guide
TL2-FG142
71
On ingress, frames with a VLAN tag with TPID = 0x8100 get classified to
the VLAN ID embedded in the tag. If a frame is untagged or priority
tagged, the frame gets classified to the Port VLAN. If frames must be
tagged on egress, they will be tagged with a C-tag.
S-Port:
On ingress, frames with a VLAN tag with TPID = 0x8100 or 0x88A8 get
classified to the VLAN ID embedded in the tag. If a frame is untagged or
priority tagged, the frame gets classified to the Port VLAN. If frames
must be tagged on egress, they will be tagged with an S-tag.
S-Custom-Port:
On ingress, frames with a VLAN tag with a TPID = 0x8100 or equal to the
Ethertype configured for Custom-S ports get classified to the VLAN ID
embedded in the tag. If a frame is untagged or priority tagged, the frame
gets classified to the Port VLAN. If frames must be tagged on egress, they
will be tagged with the custom S-tag.
Ingress
Filtering
Hybrid ports allow for changing ingress filtering. Access and Trunk ports
always have ingress filtering enabled.
If ingress filtering is enabled (checkbox is checked), frames classified to a
VLAN that the port is not a member of get discarded.
If ingress filtering is disabled, frames classified to a VLAN that the port is
not a member of are accepted and forwarded to the switch engine.
However, the port will never transmit frames classified to VLANs that it
is not a member of.
Ingress
Acceptance
Hybrid ports allow for changing the type of frames that are accepted on
ingress.
Tagged and Untagged
Both tagged and untagged frames are accepted.
Tagged Only
Only tagged frames are accepted on ingress. Untagged frames are
discarded.
Untagged Only
Only untagged frames are accepted on ingress. Tagged frames are
discarded.
Egress
Tagging
Ports in Trunk and Hybrid mode may control the tagging of frames on
egress.
Untag Port VLAN
Frames classified to the Port VLAN are transmitted untagged. Other
frames are transmitted with the relevant tag.
Tag All
All frames, whether classified to the Port VLAN or not, are transmitted
with a tag.
Untag All
All frames, whether classified to the Port VLAN or not, are transmitted
without a tag.
This option is only available for ports in Hybrid mode.
Allowed
VLANs
Ports in Trunk and Hybrid mode may control which VLANs they are
allowed to become members of. Access ports can only be member of
one VLAN, the Access VLAN.
The field's syntax is identical to the syntax used in the Enabled VLANs
field. By default, a Trunk or Hybrid port will become member of all
VLANs, and is therefore set to 1-4095.
The field may be left empty, which means that the port will not become
member of any VLANs.
Forbidden
VLANs
A port may be configured to never be member of one or more VLANs.
This is particularly useful when dynamic VLAN protocols like MVRP and
GVRP must be prevented from dynamically adding ports to VLANs.
The trick is to mark such VLANs as forbidden on the port in question. The
syntax is identical to the syntax used in the Enabled VLANs field.
Summary of Contents for TL2-FG142
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