Tail of SNMP Trap Log
Tail of SNMP Trap Log report reveals the n most recent SNMP trap notifications recorded (also known as the "tail") in the SNMP trap log. This report is useful for quick access to recent trap notifications which can be indicators of significant activities happening on your network.
- . Date and time of event.
- . Device hostname, IP address, or custom label.
- . Reflects Trap Type value in SNMP Trap Protocol Data Unit (PDU). For example: coldStart(0), linkDown(2), authenticationFailure(4), and where n>5 indicates an enterprise specific trap type.
- . SNMP PDU data fields.
: SNMP Trap listener must be enabled and either a SNMP passive monitor must be associated with a monitored device or unsolicited SNMP traps accepted. For more information, see Enabling the SNMP Trap Listener.
Generate a report
. 
Choose one or more host devices you want Tail of SNMP Trap Log measurements for.
Use the Select Device dialog for one of the following:
Control
|
Purpose
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Device 
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Browse and choose a single device.
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Single Interface 
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Choose an interface on a device.
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Device Group 
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Choose an existing group of one or more devices. You can also create custom or dynamic groups.
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: You can organize devices into custom or dynamic groups. For more information, see Grouping Devices.
. (
,
) Choose times for the Tail of SNMP Trap Log. (For recently observed measurements, select from the Date Range drop down list.)
Choose time constraints for data view
Control
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Purpose
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Date Range
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Choose or define an overall date range.
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Business hours
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- Focus on specific days of the week and periods within each day.
- Reveal trends that are sensitive to business hours, time zones, and other periodic attributes in the observed data.
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. 
Sort and remove columns, group rows based on specific column values, and remove unwanted information from the table.
Filter and pick by column
Click a report heading 
and use the following from the drop down list:
Control
|
Purpose
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Sort. 
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Sort column in ascending or descending order.
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Columns. 
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Pick the columns you want to view. Click a check box to display the column. Clear the check box to hide it.
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Group by this field.
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Group table into collapsible rows wherever the current column contains identical data ("field") values.
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Filters.
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Provide a keyword to view only rows that contain the keyword for this column.
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.
Fine tune report presentation and range of values displayed using the Report Settings dialog (optional).
Specify threshold and top n:
Control
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Purpose
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Show Top n Items
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Limit items to the samples with the highest (or lowest) utilization.
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Threshold Type
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Switch between minimum or maximum mode for cutoff values for the ranked list.
- At or Over. Show peak usage period. (Utilization percentage equal to or greater than Threshold.)
- At or Under. Show usage periods where resources are unused or possibly down. (Utilization percentage equal to or less than Threshold.)
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Threshold (percent)
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Baseline value used to trim ranked device list based on peak or subpeak capacity when returning the Top n.
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Chart and visualize data over time (single device )
Charting and visualization is available when you select a single device.
Control
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Purpose
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Display Options
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Present data as a chart, a table grid, or both.
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Chart Type
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- Gauge charts. Available when you select a Date Range of .
- Time series. Available when you select a Date Range interval (, for example).
- Line/Area. Scatter graph that connects adjacent measurements with straight lines.
- Spline/Area Spline. Choose a graph with a smoothed appearance where adjacent samples exhibit a gradual slope.
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Chart Options
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- Legend, Grid Lines, Range Selector. Include legend, grid lines, and range selector for readability.
- Trend Lines. Present data with a smoothed average to show trend.
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: Trend lines represent a moving average that can be compared with line and area graphs to reveal peak and sub peak intervals, periods of burstiness, latency, and interruption.
: This report only returns Tail of SNMP Trap Log metrics for devices that already have the appropriate WMI or SNMP credentials. For more information, see Using Credentials.
Share, export, and save as PDF
Most generated Tail of SNMP Trap Log report data can be printed, shared, and exported when selecting (
) from the Dashboard Options (
) menu. After the report has been expanded, select export (
) to access the following options:
Choose Device.