Graph Accumulator Properties
Use the Graph Accumulator Properties dialog box
to create a graph item that represents the sum (or difference) of
two or more other graph items.
For example, you may be graphing a router
interface to measure the traffic into (ifInOctets) and out of
(ifOutOctets) the interface. You could use the Accumulator
properties to create a graph item that represents the sum of
ifInOctets and ifOutOctets. This graph item would show you the full
bandwidth on the interface.
- Use the box to add (or subtract) two or more
graph items. The current graph items are shown in the Legend below
the graph. The first item is number 1, the second is number 2, and
In the box, click the plus (+) button. The
Item list appears and shows the current graph items. Select an item
and click . Then, click the
plus or minus button again to add or subtract a second item. You
can add or subtract more items in the same way.
- Set any of the following options:
- . When selected, graphs the reported values of an
SNMP object rather than graphing the
change between the last reported value and the current value (which
is the default method). When graphing a counter, such as
ifOutOctets, the reported values will continuously increase, so if
you selected ,
the graph will continue to "stair-step" up the scale. Counters are
best graphed using the default method, which uses the change in
value. Absolute values are appropriate for SNMP objects that have
integer values, such as the number of FTP users on an FTP
- . When selected, the graph scale
for the SNMP object is determined by the graphing utility. This is
a relative scale that is calculated to make the graph fit into the
vertical scale. If you turn off this option, the option becomes active and you can
enter a value to scale the graph.
When is cleared (not
checked), you can enter a fixed value in this text box to determine
the scale of the graph. You may want to try different values in
this box until you find a scale that is useful.
- . When selected, it multiplies the value reported for
the SNMP object by 8 to approximate the count in bits. This option
can be used with SNMP objects that are counters, for example if you
want to know the baud rate while monitoring a T1 router port, you
want (ifOutOctets * 8) to give you a value close to the real baud
- . When selected, it calculates the average change
per second in the values reported for the SNMP object, and then
graphs the result. To calculate this average, it takes the
difference between the latest reported value and the previously
reported value, then divides by the number of seconds between
reported values. This is useful when the graph is different than one second. You
cannot use this option with the option.
- . When selected, it clears the values for the
selected SNMP object when you exit the dialog box. You can clear
the values for all SNMP objects on the graph, from the
menu, by selecting
- . Sets the width of the line that represents the
selected SNMP object on the graph. Select a width from the list
Sets the color of the line that represents the selected SNMP object
on the graph. Select a color from the list box.
- Click to add the item to the graph. This new
graph item represents the combination of one or more graph items.
In the Legend, the Object field for the item will show the list
numbers of the graph items. For example, if the new item represents
the sum of the first two items in the Legend, the Object field will
show "+1+2" for the new item.