During the licensing and initial configuration procedures, you configure a single VLAN and associated self IP addresses. This is all the networking configuration required to start managing devices. However, if you find you need additional VLANs and self IP addresses, the BIG-IQ® system provides you with the ability to add them as required.
A VLAN tag is a unique ID number between 1 and 4094. All messages sent from a host in this VLAN includes the tag as a header in the message to identify the specific VLAN where the source or destination host is located. If you do not assign a tag, BIG-IQ assigns one automatically.
The interface is a physical or virtual port that you use to connect the BIG-IQ system to managed devices in your network.
By default, BIG-IP devices use the standard Ethernet frame size of 1518 bytes (1522 bytes if VLAN tagging is used) with the corresponding MTU of 1500 bytes. For BIG-IP devices that support Jumbo Frames, you can specify another MTU value.