INS_CNGE24MS-OB(M,S)_REV–
09/12/12 PAGE 50
INSTALLATION AND OPERATION MANUAL
CNGE24MS-OB(M,S)
TECH SUPPORT: 1.888.678.9427
How to use Unaware / C-Port / S-Port / S-Custom-Port
Port can be one of the following types: 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 received untagged frames, an
untagged frame obtain a tag (based on PVID) and is
forwarded.
When the port received tagged frames,
1. If the tagged frame with TPID=0x8100, it become a
double-tag frame, and is forwarded.
2. If the TPID of tagged frame is not 0x8100 (ex.
0x88A8), it will be discarded.
The TPID of frame transmitted
by Unaware port will be set to
0x8100.
The final status of the frame after
egressing are also effected by
Egress Rule.
C-port
When the port received untagged frames, an
untagged frame obtain a tag (based on PVID) and is
forwarded.
When the port received tagged frames,
1. If a tagged frame with TPID=0x8100, it is forwarded.
2. If the TPID of tagged frame is not 0x8100 (ex.
0x88A8), it will be discarded.
The TPID of frame transmitted by
C-port will be set to 0x8100.
S-port
When the port received untagged frames, an
untagged frame obtain a tag (based on PVID) and is
forwarded.
When the port received tagged frames,
1. If a tagged frame with TPID=0x88A8, it is
forwarded.
2. If the TPID of tagged frame is not 0x88A8 (ex.
0x8100), it will be discarded.
The TPID of frame transmitted by
S-port will be set to 0x88A8.
S-custom-port
When the port received untagged frames, an
untagged frame obtain a tag (based on PVID) and is
forwarded.
When the port received tagged frames,
1. If a tagged frame with TPID=0x88A8, it is
forwarded.
2. If the TPID of tagged frame is not 0x88A8 (ex.
0x8100), it will be discarded.
The TPID of frame transmitted
by S-custom-port will be set to
an self-customized value, which
can be set by the user using the
column of Ethertype for Custom
S-ports.
