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KVM over IP User Manual
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.
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.
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