Lantronix SISPM1040-xxxx-L3 Web User Guide
33856 Rev. A https://www.lantronix.com/ 85
The following example will create VLANs 1, 10, 11, 12, 13, 200, and 300: 1,10-13,200,300. Spaces are allowed in
between the delimiters.
Ethertype for Custom S-ports: This field specifies the Ethertype/TPID (specified in hexadecimal) used for
Custom S-ports. The setting is in force for all ports whose Port Type is set to S-Custom-Port.
EtherType is a two-octet field in an Ethernet frame used to indicate which protocol is encapsulated in the payload
of the frame and is used at the receiving end by the data link layer to determine how the payload is processed.
The same field is also used to indicate the size of some Ethernet frames. See the IANA webpage.
The TPID (Tag Protocol Identifier) is a 16-bit field set to 0x8100 to identify the frame as an IEEE 802.1Q-tagged
frame. This field is located at the same position as the EtherType field in untagged frames and is thus used to
distinguish the frame from untagged frames. See the IANA webpage.
Port VLAN Configuration
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. When 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 these 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 not classified to the Access VLAN.
• On egress all frames are transmitted untagged.
Trunk: Trunk ports can carry traffic on multiple VLANs simultaneously and are normally used to connect
to other switches. Trunk ports have these 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 add 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 1-4095 the default is 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.
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