User’s Manual of GS-5220 LCD Series
198
• 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.
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