IF-MIB supports interface types (physical and logical)
and larger counters (64K) beyond those defined in MIB-II. Use this
MIB to monitor interface statistics in addition to those that MIB-II
provides. For example, to monitor the current bandwidth of high-speed
interfaces (greater than 2.2Gps) such as the 10G interfaces of the
PA-5200 Series firewalls, you must check the ifHighSpeed object
in IF-MIB instead of the ifSpeed object in MIB-II. IF-MIB statistics can
be useful when evaluating the capacity of your network.
Palo Alto Networks firewalls, Panorama, and WF-500 appliances
support only the ifXTable in IF-MIB, which provides interface information
such as the number of multicast and broadcast packets transmitted
and received, whether an interface is in promiscuous mode, and whether
an interface has a physical connector.