Network interface naming convention

The interface names you see inside the guest (0.x or blade/0.x) are internal interfaces behind the switch chip on the blade. They don't tie directly to any specific external port on the blade. The mapping from guest to external port is based on the vlan(s) assigned to that guest. Since you asked about reserved ports, the 0.1 interface is reserved, to the hypervisor. Other 0.x interfaces may also be unused depending on the specific hardware and BIG-IP version on the hypervisor. On the hypervisor, or in non-vcmp mode the system also uses 0.x interfaces, they are just normally hidden so they don't appear by default in the gui interface list or in tmsh show net interface. If you wish to see them, you may issue "tmsh show net interface -hidden."

The short short version is that the 0.x interfaces are internal, and are allocated/managed by the system, there's no method for managing them directly as an end user. And inside vcmp guests, the external interfaces aren't directly visible anyway (except for some status info about trunks for HA purposes), the guest just works with the vlan objects.