NEC ipasolink 400 - Bridge Modes (802.1 Q and 802.1 Ad)

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BRIDGE MODES (802.1Q AND 802.1AD)
Bridge mode (aka VLAN mode) is selected under Bridge Setting. The VLAN port types are as follows:
802.1q type
Ingress port action
Egress port action
Access port
Adds the assigned tag if
no incoming tag.
Accepts tagged frames
with the assigned VID
only, does not add
double tag. One VID per
access port.
Will not forward the
frame unless the
assigned VID. Always
removes the tag.
Tunnel port
Adds the assigned tag
always (double tagging if
tag already). Adds a
double tag over an
assigned tag.
One VID per tunnel port.
Forwards only frames
with the assigned outer
tag VID. Removes that
tag always.
Trunk port
(modem port is trunk
always)
Accepts only assigned
VIDs. Does not add any
tag. Several VID per port.
Forwards only frames
with the assigned tag
VID. Does not remove
the tag.
Table 13 . 802.1q –mode. Ethernet frame TPID = 0x8100.
802.1ad type
Ingress port action
Egress port action
C-Access port
Adds always the
assigned S-VID tag.
Accepts untagged
frames. Drops frames
with a wrong S-tag. One
S-VID per port.
Will not forward the
frame unless the
assigned S-VID. Always
removes the S-tag.
C-Bridge-port
Assign one S-VID and
several C-VID. Untagged
frames dropped. Accepts
frames with assigned C-
VID and adds the S-VID
tag. Accepts assigned S-
VID outer tag with any C-
VID tag.
Forwards only assigned
S-VID double tagged
frames. Removes the S-
tag. Egress frame may
only have the assigned
C-VID.
S-Trunk port
(modem port always)
Accepts only double
tagged frames with the
assigned S-VID-tag.
Never adds an S-tag.
Several S-VID per port.
Forwards only assigned
S-VID tagged frames.
Does not remove the S-
tag.
Table 14. 802.1ad mode. Ethernet frame TPID = 0x88a8. C-tag TPID = 0x8100.