Lantronix
SM12XPA Web User Guide
33848 Rev. A
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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 of which it is not a member.
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 Existing VLANs field. By default, a port may become member of all possible VLANs, and is
therefore set to 1-4095. The field may be left empty, which means that the port will not be member of any of
the existing VLANs, but if it is configured for VLAN Trunking it will still be able to carry all unknown 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. By default, the field is left blank, which means that the port may become
a member of all possible VLANs.
Buttons
Apply
: Click to save changes.
Reset
: Click to undo any changes made locally and revert to previously saved values.