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In summary, RMON can provide a number of host-derived statistics; and stores these statistics in several different ways for the convenience of the end user.
In the previous example, we studied how RMON maintains statistics of a networks operation. In this case study, we will show how RMON can extend that capability to send a notification if a particular network parameter has exceeded the range of acceptable operation. The network consists of a single Ethernet segment with an attached RMON network management console and remote monitoring agent, or probe (Figure 7-11). In order for the probe to monitor and respond to a particular network statistic, it must first be programmed by the manager (see Trace 7.11a).
Figure 7-11 RMON event notification
Trace 7.11a. RMON threshold analysis summary
Trace 7.11a. RMON threshold analysis summary
Sniffer Network Analyzer data from 21-Feb at 16:47:08, file TRAP.ENC, Page 1 SUMMARY Delta T Destination Source Summary M 1 Probe Manager SNMP Get sysUpTime .. ifSpeed (3 items) 2 0.0020 Manager Probe SNMP GetReply sysUpTime .. ifSpeed (3 items) 3 0.0396 Probe Manager SNMP Get sysUpTime 4 0.0007 Probe Manager SNMP Set Protools.2.1.2. XXX.YYY.135.195, Protools.2.1.3. XXX.YYY.135.195 5 0.0006 Manager Probe SNMP GetReply sysUpTime = 69284 ticks 6 0.0008 Manager Probe SNMP GetReply Protools.2.1.2. XXX.YYY.135.195, Protools.2.1.3. XXX.YYY.135.195 7 0.0041 Probe Manage SNMP GetNext rmon.4.1.1.5.0, rmon.4.1.1.2.0 8 0.0008 Probe Manager SNMP GetNext rmon.1.1.1.20.0, rmon.1.1.1.2.0 9 0.0008 Manager Probe SNMP GetReply rmon.4.1.1.5.1, rmon.4.1.1.2.1 10 0.0008 Manager Probe SNMP GetReply rmon.1.1.1.20.1, rmon.1.1.1.2.1 11 0.0155 Probe Manager SNMP Set rmon.9.1.1.7.31860 = 2 12 0.0006 Probe Manager SNMP Get rmon.1.1.1.5.1 13 0.0008 Manager Probe SNMP GetReply rmon.9.1.1.7.31860 = 2 14 0.0007 Manager Probe SNMP GetReply rmon.1.1.1.5.1 = 74126 15 0.0012 Probe Manager SNMP Set rmon.9.1.1.2.31860.. rmon.9.1.1.6.31860 (4 items) 16 0.0014 Manager Probe SNMP GetReply rmon.9.1.1.2.31860.. rmon.9.1.1.6.31860 (4 items) 17 0.0012 Probe Manager SNMP Set rmon.9.1.1.7.31860 = 1 18 0.0010 Manager Probe SNMP GetReply rmon.9.1.1.7.31860 = 1 19 0.0011 Probe Manager SNMP Set rmon.3.1.1.12.29148 = 2 20 0.0010 Manager Probe SNMP GetReply rmon.3.1.1.12.29148 = 2 21 0.0025 Probe Manager SNMP Set rmon.3.1.1.2.29148.. rmon.3.1.1.11.29148 (9 items) 22 0.0019 Manager Probe SNMP GetReply rmon.3.1.1.2.29148.. rmon.3.1.1.11.29148 (9 items) 23 0.0016 Probe Manager SNMP Set rmon.3.1.1.12.29148 = 1 24 0.0010 Manager Probe SNMP GetReply rmon.3.1.1.12.29148 = 1 25 0.0011 Probe Manager SNMP GetNext rmon.9.2.1.3.31860, rmon.9.2.1.4.31860 26 0.0014 Manager Probe SNMP GetReply rmon.11.1.0, rmon.11.1.0 27 0.0011 Probe Manager SNMP Get rmon.9.1.1.7.31860, rmon.3.1.1.12.29148 28 0.0010 Manager Probe SNMP GetReply rmon.9.1.1.7.31860, rmon.3.1.1.12.29148 29 4.9868 Probe Manager SNMP Get sysUpTime = 69284 ticks 30 0.0003 Probe Manager SNMP Get rmon.1.1.1.5.1 = 74126 31 0.0009 Manager Probe SNMP GetReply sysUpTime = 69787 ticks 32 0.0007 Manager Probe SNMP GetReply rmon.1.1.1.5.1 = 74582 33 0.0087 Manager Probe SNMP Trap-v1 Enterprise specific rmon.3.1.1.1.29148.. rmon.3.1.1.7.29148 (5 items) 34 0.0003 Probe Manager ICMP Destination unreachable (Port unreachable) 35 0.0091 Probe Manager SNMP GetNext rmon.9.2.1.3.31860, rmon.9.2.1.4.31860 36 0.0012 Manager Probe SNMP GetReply rmon.9.2.1.3.31860.1, rmon.9.2.1.4.31860.1 37 0.1371 Probe Manager SNMP GetNext rmon.9.2.1.3.31860.1, rmon.9.2.1.4.31860.1 38 0.0013 Manager Probe SNMP GetReply rmon.9.2.1.4.31860.1, rmon.11.1.0 39 0.0039 Probe Manager SNMP Get rmon.9.1.1.7.31860, rmon.3.1.1.12.29148 40 0.0010 Manager Probe SNMP GetReply rmon.9.1.1.7.31860, rmon.3.1.1.12.29148 41 1.8471 Probe Manager SNMP Set rmon.3.1.1.12.29148 = 4 42 0.0004 Probe Manager SNMP Set rmon.9.1.1.7.31860 = 4 43 0.0008 Manager Probe SNMP GetReply rmon.3.1.1.12.29148 = 4 44 0.0003 Probe Manager ICMP Destination unreachable (Port unreachable) 45 0.0011 Manager Probe SNMP GetReply rmon.9.1.1.7.31860 = 4
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