ZyXEL Communications RGS Series User Manual page 144

Ingress Filtering
Ingress Acceptance
Egress Tagging
Allowed VLANs
Forbidden VLANs
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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:
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
configured for Custom-S ports
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.
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.
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.
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.
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
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.
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
By default, the field is left blank, which means that the port may become a member of
all possible VLANs.
get classified to the VLAN ID embedded in the tag. If a
Enabled VLANs
Enabled VLANs field.
Ethertype
field. By