VLAN
VLAN – Configuration
Microsemi PDS-408G Web Management User Guide Ver. 1.0.1, 03-2019
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Hybrid
: Hybrid ports are very similar to Trunk ports with the following extra features:
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Can be configured to be VLAN tag unaware, C-tag aware, S-tag aware, or S-custom-tag aware.
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Ingress filtering can be controlled.
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Ingress acceptance of frames and configuration of egress tagging can be configured
independently.
Port VLAN
: configure port VLAN ID (also named as PVID).
Valid VLAN values range from 1-4095,
with the default value 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.
Port Type
: Ports in hybrid mode allow for changing the port type, i.e., whether a frames 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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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.
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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.
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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.
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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 that it is not a member of.
Ingress Acceptance
: Hybrid ports allow for changing the type of frames that are accepted on ingress.
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Tagged and Untagged:
Both tagged and untagged frames are accepted.
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Tagged Only:
Only tagged frames are accepted on ingress. Untagged frames are discarded.
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Untagged Only:
Only untagged frames are accepted on ingress. Tagged frames are
discarded.
NOTE:
The Ingress filter is inactive (accept all) when the port is configured as Hybrid
Unaware.