INS_CNXE2GE2TX8MSPOE 11 Jan 2021 PAGE 84
INSTALLATION AND OPERATION MANUAL
CNXE2GE2TX8MSPOE
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Label
Description
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 = 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.
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.
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.
