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Port VLAN Configuration
Port
This is the logical port number of this row.
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.
Whenever a particular mode is selected, the remaining fields in that row are either
grayed out or made changeable depending on the mode in question.
Grayed out fields show the value that the port gets when the mode is applied.
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 the
following characteristics:
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Trunk ports can carry traffic on multiple VLANs simultaneously, and are normally used
to connect to other switches. Trunk ports have the following characteristics:
Mode
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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:
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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).
Port VLAN
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.
RocketLinx MP1204-XT User Guide: 2000644 Rev. A
Configuration | VLANs (Continued)
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 that are not classified to the Access VLAN
On egress all frames classified to the Access VLAN are transmitted untagged. Other
(dynamically added VLANs) are transmitted tagged
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
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
Configuration | VLANs
Configuration Pages - 145
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