iES28TG/iES28GF User Manual
86
iS5 Communications Inc.
Introduction of Port Types
Below is a detailed description of each port type, including Unaware, C-port, S-port, and S-
custom-port.
Ingress action
Egress action
Unaware
The function of
Unaware can be used
for 802.1QinQ (double
tag).
When the port receives untagged frames,
an untagged frame obtains a tag (based on
PVID) and is forwarded.
When the port receives tagged frames:
1.
If the tagged frame contains a TPID of
0x8100, it will become a double-tag frame
and will be forwarded.
2.
If the TPID of tagged frame is not
0x8100 (ex. 0x88A8), it will be
discarded.
The TPID of a frame
transmitted by
Unaware port will be set
to 0x8100.
The final status of the
frame after egressing
will also be affected by
the Egress Rule.
C-port
When the port receives untagged frames,
an untagged frame obtains a tag (based on
PVID) and is forwarded.
When the port receives tagged frames:
1.
If the tagged frame contains a TPID of
0x8100, it will be forwarded.
2.
If the TPID of tagged frame is not
0x8100 (ex. 0x88A8), it will be
discarded.
The TPID of a frame
transmitted by C-port
will be set to 0x8100.
S-port
When the port receives untagged frames,
an untagged frame obtains a tag (based on
PVID) and is forwarded.
When the port receives tagged frames:
1.
If the tagged frame contains a TPID of
0x8100, it will be forwarded.
2.
If the TPID of tagged frame is not
0x88A8 (ex. 0x8100), it will be
discarded.
The TPID of a frame
transmitted by S-port will
be set to 0x88A8.
