ZyXEL Communications ONU-2024 Series, Руководство пользователя

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Chapter 8 VLAN
ONU User’s Guide
81
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
VLAN Administrative
Control Registration Fixed Fixed registration ports are permanent VLAN members.
Registration
Forbidden Ports with registration forbidden are forbidden to join the
specified VLAN.
Normal Registration Ports dynamically join a VLAN using GVRP.
VLAN Tag Control 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.
VLAN Port Port VID This is the VLAN ID assigned to untagged frames that
this port received.
Acceptable Frame
Type You may choose to accept both tagged and untagged
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
Table 13 IEEE 802.1Q VLAN Terminology (continued)
VLAN PARAMETER TERM DESCRIPTION