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To diagnose many network problems, it is necessary to look beyond the overall health of the network and focus on the operation of individual devices. The RMON hosts, hostTopN, and matrix groups are designed for those purposes: they look at host operation, hosts whose operation tops a list of particular statistics, and a matrix of host-to-host communication, respectively. In this example, we will use the capabilities of RMON to look at some host-specific characteristics, and then well zoom in on one particular host to discover its communications characteristics (see Figure 7-10).
Figure 7-10. Gathering host statistics
A summary of the network operation shows a variety of RMON activities (Trace 7.10a). Note that Frames 12 are accessing information from the hostTable, {1.3.6.1.2.1.16.4.2} or {rmon 4.2}; Frames 332 are accessing information from the matrixSDTable {1.3.6.1.2.1.16.6.2} or {rmon 6.2}; and Frame 3352 are accessing information from the matrixDSTable, {1.3.6.1.2.16.6.3 } or {rmon 6.3}. (As a review, the hostTable contains statistical data about a particular host; the matrixSDTable contains statistics for a particular conversation between two addresses, indexed by source and destination MAC addresses; and the matrixDSTable contains statistics for a particular conversation between two addresses, but this time, indexed by destination and source MAC addresses.)
Trace 7.10a. RMON host information (summary)
Sniffer Network Analyzer data from 25-Feb at 17:24:44, file TOPNIPCN.ENC, Page 1 SUMMARY Delta T Destination Source Summary M 1 Probe Manager SNMP Get rmon.4.2.1.1.20480 2 0.0032 Manager Probe SNMP GetReply rmon.4.2.1.1.20480 3 0.0052 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 4 0.0032 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 5 0.0049 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 6 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 7 0.0047 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 8 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 9 0.0046 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 10 0.0032 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 11 0.0047 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 12 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 13 0.0048 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 14 0.0030 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 15 0.0047 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 16 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 17 0.0046 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 18 0.0032 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 19 0.0048 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 20 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 21 0.0047 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 22 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 23 0.0049 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 24 0.0030 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 25 0.0047 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 26 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 27 0.0047 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 28 0.0031 Manager Probe SNMP GetReply rmon.6.2.1.1.20480. 29 0.0048 Probe Manager SNMP GetNext rmon.6.2.1.1.20480 30 0.0030 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 31 0.0048 Probe Manager SNMP GetNext rmon.6.2.1.1.20480. 32 0.0030 Manager Probe SNMP GetReply rmon.6.2.1.1.20480 33 0.0048 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 34 0.0030 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 35 0.0047 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 36 0.0031 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 37 0.0046 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 38 0.0032 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 39 0.0047 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 40 0.0031 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 41 0.0047 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 42 0.0031 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 43 0.0046 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 44 0.0032 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 45 0.0047 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 46 0.0031 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 47 0.0047 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 48 0.0031 Manager Probe SNMP GetReply rmon.6.3.1.1.20480.. 49 0.0049 Probe Manager SNMP GetNext mon.6.3.1.1.20480 50 0.0032 Manager Probe SNMP GetReply rmon.6.3.1.1.20480 51 0.0048 Probe Manager SNMP GetNext rmon.6.3.1.1.20480 52 0.0031 Manager Probe SNMP GetReply rmon.6.3.1.1.20480
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