VLANs are logical subnets that isolate traffic to a single group. Many VLANs can coexist on a single Ethernet cable (typically referred to as a 'VLAN Trunk'). The AP can place traffic on any VLAN to which it is exposed and tunnel traffic between two APs with a GRE tunnel. Other options are bridging locally at the controller, VxLAN, and Fabric Attach. Fabric Attach enables the AP to connect to a Fabric Network.
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 IQ Controller 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 IQ Controller 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.
With switches, all administrator-created VLANs in ExtremeCloud IQ Controller 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.
Associate a topology to a specific device group. This enables you to define a topology that is common to a set of devices and specify a specific attached VLAN. Topologies referenced by attached networks or roles are automatically added to the Profile VLANS list. You can also add topologies manually to the list. When creating a new topology, select the Profiles to associate with the new topology.