VLANs are logical subnets. Many VLANs can coexist on a single Ethernet cable (typically referred to as a VLAN Trunk). The AP is a VLAN-aware bridging device. It can place traffic on any VLAN to which it is exposed.
It is not necessary to include a VLAN tag in a packet that is being transmitted over a VLAN. A packet transmitted without a VLAN tag is said to be untagged. Since there is no way to identify the VLAN to which an untagged packet belongs, there can be only one untagged VLAN on a VLAN trunk.
It is common practice to place all AP management traffic on an untagged VLAN and place user traffic on tagged VLANs. ExtremeCloud preconfigures switches with a single untagged VLAN that is used for managing access points and the switches themselves.
Another common option is to place all traffic on a single untagged VLAN. This is a simpler option to use when a network's applications do not benefit from VLAN deployment.
ExtremeCloud fully supports mixing tagged and untagged traffic. An AP wired interface can be an untagged member of one VLAN and a tagged member of several other VLANs simultaneously.
All administrator-created VLANs in ExtremeCloud are classified as tagged VLANs when a tagged VLAN is assigned to a port. The port is configured to expect all traffic received from the VLAN or sent to the VLAN to be tagged. You can override the tagging on a per-port basis for the ports types Host and Other.
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