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Table 13 IEEE 802.1Q VLAN Terminology (continued)
VLAN PARAMETER TERM
VLAN Administrative
Control
VLAN Tag Control
VLAN Port
Port VLAN Trunking
Enable VLAN Trunking on a port to allow frames belonging to unknown VLAN groups to
pass through that port. This is useful if you want to set up VLAN groups on end devices
without having to configure the same VLAN groups on intermediary devices.
Refer to the following figure. Suppose you want to create VLAN groups 1 and 2 (V1 and V2)
on devices A and B. Without VLAN Trunking, you must configure VLAN groups 1 and 2 on
all intermediary switches C, D and E; otherwise they will drop frames with unknown VLAN
group tags. However, with VLAN Trunking enabled on a port(s) in each intermediary switch
you only need to create VLAN groups in the end devices (A and B). C, D and E automatically
allow frames with VLAN group tags 1 and 2 (VLAN groups that are unknown to those
switches) to pass through their VLAN trunking port(s).
Figure 29 Port VLAN Trunking
ONU User's Guide
DESCRIPTION
Registration Fixed
Fixed registration ports are permanent VLAN members.
Registration
Ports with registration forbidden are forbidden to join the
Forbidden
specified VLAN.
Normal Registration
Ports dynamically join a VLAN using GVRP.
Tagged
Ports belonging to the specified VLAN tag all outgoing
frames transmitted.
Untagged
Ports belonging to the specified VLAN don't tag all
outgoing frames transmitted.
Port VID
This is the VLAN ID assigned to untagged frames that
this port received.
Acceptable Frame
You may choose to accept both tagged and untagged
Type
incoming frames, just tagged incoming frames or just
untagged incoming frames on a port.
Ingress filtering
If set, the ONU discards incoming frames for VLANs that
do not have this port as a member
Chapter 8 VLAN
81
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