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Chapter 9 VLAN
MES-3528 User’s Guide
93
9.3 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
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 Switch 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