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Cajun P550/P880/P882 Switch User Guide
Configuring Port Parameters
5-11
Bind to Received 802.1Q
Multi-
layer
Ingress: Untagged frames are classified to the VLAN
associated with the port on which the frame is
received. Tagged frames are classified to the VLAN
identified by the VLAN tag in the tag header of the
frame.**
Note: For 802.1q mode: if a tagged frame is received,
but the VLAN for that tagged frame does not
exist on the switch, that frame will placed onto
the port VLAN assigned to the port. This may
cause unicast and broadcast VLAN traffic from
other VLANs to be seen on the port VLAN. To
avoid this behavior, you can set the port VLAN
into the “discard” VLAN which will drop all
untagged frames and tagged frames with
unknown VLAN IDs.
For Multi-layer and 3Com mode: if a tagged
frame is received, but the VLAN for that tagged
frame does not exists on the switch, that frame
will be dropped.
Forwarding: All broadcast frames from all VLANs
learned on the port will be forwarded.
Egress: All frames transmitted out of the port to be
tagged using the IEEE 802.1Q/Multi-Layer tag header
format. The tagged used will be that of the VLAN in
which the frame was received.
N/A 3Com Ingress: Untagged frames are not allowed (in most
cases untagged frames will be dropped). Tagged frames
are classified to the VLAN corresponding to the 3Com
tag in the corresponding entry of the 3Cm Mapping
Table assigned to the port.
Forwarding: Only forward frames to the port that
belongs to the VLANs listed in the 3Com Mapping
Table of the port.
Egress: All frames transmitted out of the port to be
tagged using the 3Com tag header format. The tagged
used will be that of the VLAN in which the frame was
received.
Table 5-3. Relationship Between Switch Parameters continued
VLAN
Binding
Trunk
Mode
Description