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User Manual Managed Switches
96
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.
Setting
Description
Factory
Default
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. This port type can only be
selected if port mode is Hybrid.
C-Port
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 = 0x88A8
get classified to the VLAN ID embedded in the tag.
Priority-tagged frames are classified to the Port VLAN.
If the port is configured to accept Tagged Only frames
(see Ingress Acceptance below), frames without this
TPID are dropped.
If frames must be tagged on egress, they will be tagged
with an S-tag. This port type can only be selected if port
mode is Hybrid.
S-Custom-Port
On ingress, frames with a VLAN tag with a TPID equal to
the Ethertype configured for Custom-S ports get
classified to the VLAN ID embedded in the tag.
Priority-tagged frames are classified to the Port VLAN.
If the port is configured to accept Tagged Only frames
(see Ingress Acceptance below), frames without this
TPID are dropped.
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.
Setting
Description
Factory
Default
Checked /
Unchecked
If checked (ingress filtering enabled), frames classified
to a VLAN that the port is not a member of get
discarded.
If ingress filtering is disabled (unchecked), 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.
Checked