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 frames and C-tagged frames,
• discards all frames that are 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 existing VLANs. This may be limited by the use of Allowed
VLANs,
• unless VLAN Trunking is enabled on the port, frames classified to a VLAN that the port is not a
member of will be 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,
• VLAN trunking may be enabled.
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; 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.
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 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
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