Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 270 of 669
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.
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.
Tagged and Untagged
: Both tagged and untagged frames are accepted.
Tagged Only
: Only tagged frames are accepted on ingress. Untagged frames are discarded.
Untagged Only
: Only untagged frames are accepted on ingress. Tagged frames are discarded.
Egress Tagging
Ports in Trunk and Hybrid mode may control the tagging of frames on egress.
Untag Port VLAN
: Frames classified to the Port VLAN are transmitted untagged. Other frames
are transmitted with the relevant tag.
Tag All
: All frames, whether classified to the Port VLAN or not, are transmitted with a tag.
Untag All
: All frames, whether classified to the Port VLAN or not, are transmitted without a tag.
This option is only available for ports in Hybrid mode.
Allowed VLANs
Ports in Trunk and Hybrid mode may control which VLANs they are allowed to become members
of. Access ports can only be members of one VLAN, the Access VLAN.