During the licensing and initial configuration procedures, you specify the management port for BIG-IQ®. This is all the networking configuration required to start managing devices. However, if you would prefer to manage devices from a VLAN address, you have the option to configure that.
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.