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• 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 the following 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,
default being 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.
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