Reading Monitor graphs

Definitions

• Graph Period - The links at the top-right of every graph page select the full period (width) of the graph.
  
  

• Data Resolution Period - When a Graph Period is selected, the Data Resolution Period (scale) of the graph is automatically changed. This shows the measurement interval within the Graph Period. The Data Resolution Period is always displayed at the top-left of the graph page. This Period is the time between each graph point on the x-axis of the graph.
  
  

Sub-graph labels

Many graphs include several sub-graphs and two types of sub-graphs – data rates and drops – for specific parameters. If not obvious from the graph types, labels below the graph will include one of two labels:

• Packets/Sec for data rate sub-graphs.
• Packets/5-Minute Period for drop graphs. See the Graphs showing drops below for details on how these are displayed.

Sub-graph labels are color-matched to the sub-graphs long the bottom edge of the graph. You may hide specific sub-graph displays from the graph by clicking the label. All sub-graphs and labels will default-on if you leave that page.

Graphs that contain many subgraph labels will display “pagination” information to the right of all labels.

Monitor Graph Data Resolution

All Monitor graphs calculate the MAXIMUM data rate (pps, bps, connections, etc.) over a 5-minute period and depending on the graph Period (upper-right 1-hour, 8-hour, 1-day, etc.) selection, display:

• For 1-hour, 8-hour and 1-day selections, the MAXIMUM data rate per 5-minute period.
• For all other Period selections, the graph shows the MAXIMUM of the 5-minute MAXIMUM rates across the Period Selected. For example, for the:
  • 1-week Period, the graph shows the MAXIMUM rate from the highest of the 12 x 5-minute MAXIMUM rates across a 1-hour period.
  • 1-month Period, the graph shows the MAXIMUM from the highest of the 36 x 5-minute MAXIMUM rates across a 3-hour period.

Special Traffic Graphs

One-hour Graph Periods for:

• Dashboard > Interfaces (aggregate Interface traffic)
• FortiView > SPP > View > SPP Traffic Chart
• Monitor > Interfaces

Use a 30-second Data Resolution Period to provide better granularity. All other Graph Periods follow the information above.

Graphs showing drops

Drop graphs display the highest number of dropped packets for any 5-minute interval within the Data Resolution Period displayed at the top-left of the graph.

For 1-hour, 8-hour and 1-day Periods, the Data Resolution Period is 5-minutes and the drop graph shows the maximum drops per-5-minute interval.

For Periods longer than 1-day, drops are not aggregated - only the maximum 5-minute drop count for any interval over each Data Resolution Period is displayed. For example, for a 1-week Graph Period (top-right of the page), the Data Resolution Period (top-left) is 1-hour and the drop graphs will show the maximum number of drops seen for any of the 12 x 5-minute intervals in that hour. The drops are not accumulated for the entire hour. The same is true for longer Periods.

Graphs Y-Axis

To display both large flood drops and smaller anomaly drops, on the same graph, set the Y-axis view to 'Logarithmic' at the top-right of the page.

Graph Refresh

Graphs on the Dashboard > Status page auto-refresh every 30 seconds.

All other graphs do not auto-refresh. There is a circular arrow icon at the top-right of every page to manually refresh.