This MIB defines objects related to statistics for the usage of switch fabric. The switch fabric is used by the incoming packets from the line/network to a interface. Such packets are called ingress packets. Counters are maintained for number of ingress packets/ octets switched by the switch fabric for each interface. NOTE: These counters are not counting the total number of incoming packets and octets for a particular interface. Instead only the counts of packets and octets that actually use the switch-fabric are being accounted for by this MIB. Therefore, the counters in this MIB are distinctly different from packet and octet counters found in the IF-MIB.