VLAN Configuration VLAN Membership Principles and Rules
VLAN Membership Principles and Rules
Port membership to a VLAN is determined by the bridge port on which data frames are
received. VLAN cross-connections provide forwarding rules applied on each port configured
as a member in a specific VLAN. The guidelines provided in this section explain various
VLAN port membership forms and rules.
VLAN Membership Principles
IEEE 802.1Q provides support for 'virtual bridged LANs' where a single bridged physical
LAN network may be used to support multiple logical bridged LANs, each of which offers a
service approximately the same as that defined by IEEE 802.1D. Such virtual LANs
(VLANs) are an integral feature of switched LAN networks. A VLAN can be viewed as a
group of end-stations on multiple LAN segments and can communicate as if they were on a
single LAN. IEEE 802.1Q defines port-based Virtual LANs where membership is determined
by the bridge port on which data frames are received.
Generally, ports can be specified as Tagged, Stacked or Untagged per VLAN and can be
allocated to multiple VLANs. However, there are some membership limitations as described
in this section. Some of the limitations apply to all ML models while other limitations are
model specific.
VLAN cross-connections provide forwarding rules applied on each port configured as a
member in a specific VLAN. There are three membership forms for ports participating in a
VLAN:
Ports that are tagged members of a VID
Ports that are untagged members of a VID
Ports that are stacked members of a VID
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