RMON probes listen to traffic on the network and record statistics or capture traffic according to their configuration. The statistics and saved traffic retrieved by the network management station, using the SNMP protocol, are stored in a MIB.
Using the ASN.1 standard, the managed objects comprising the RMON1 MIB groups, represented by leaves, are grouped into a tree structure, as show in Figure 1. The rmon group specifies the objects relating to the RMON1 MIB objects (RMON2 MIB objects are described in RMON2 MIB group).
Figure 1. RMON1
MIB group structure 