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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.

7.11 Event Notification Using RMON

In the previous example, we studied how RMON maintains statistics of a network’s 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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