RMON Statistics Collection Introduction
7-95
Software Reference for SwitchBlade x3100 Series Switches (Network Management)
7.5.2 RMON Statistics Collection
RMON collects Ethernet statistics for each monitored interface on the system. These statistics take the form
of running counters that start from zero when a valid entry is created. Rising and falling thresholds are set to
generate logs and traps.
RMON configuration data contains the following attributes:
• Interval times are controllable (defaults are set at 30 seconds and 30 minutes).
• Two thresholds can be set:
• Rising threshold - When a statistical value rises above a threshold, a log is produced and a trap is sent to an
SNMP browser
• Falling threshold - When a statistical value drops below a threshold, an associated log/trap is produced.
• During the time interval, once the falling threshold is crossed, the rising threshold trap/log is produced again.
Figure 7-13 shows how the rising and falling thresholds affect the RMON data collection.
FIGURE 7-13 Thresholds for RMON Statistics
7.5.3 Management Logs for RMON (Ethernet-Based) Thresholds
The following log examples show the management logs produced when the set thresholds (in this case, ether-
StatsBroadcastPkts for a falling value of 10 and a rising value of 100) are crossed. Refer to Figure 7-13 to under-
stand how these thresholds work.
• Management log produced when rising threshold occurs:
RMON003 2004-06-16 13:27:07 6071 INFO
Location : ETH:6.0
Description: etherStatsBroadcastPkts Rising Alert
Type : Absolute
Threshold : 100
Value : 0
Rising
(200)
Falling
(100)
1
1
2
2
3
3
4
4
5
5
6
Rising threshold 200 crossed,
log/trap generated
,,
No logs/traps generated
5
Falling threshold 100 crossed,
log/trap generated
6
Since falling threshold cr
at
, rising log/trap g
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