57153908_Net_SNMP__Description
[Name] 36 ipSystemStatsInMcastOctets [Type] COUNTER [Access] ReadOnly [Description] 
The total number of octets received in IP multicast datagrams. Octets from datagrams counted in ipSystemStatsInMcastPkts MUST be counted here. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ipSystemStatsDiscontinuityTime.
Net-SNMP
Description