Users Guide

Monitoring Network Availability | Performance Monitoring
388 OMNM 6.5.3 User Guide
How To:
Create an SNMP Interface Monitor
To set up a typical performance monitor, follow these steps:
1 In the Resource Monitors portlet, and create a new monitor by right-clicking and selecting
New .
2 Select the type of monitor from the submenu—for this example, an SNMP Interfaces
monitor.
NOTE:
Some devices have ports rather than interfaces. This monitor works for them too, even though it is an
“interface” monitor.
3 In the General screen, enter a polling interval (5 minutes is the default). For this example,
check
Retain polled data and accept the remaining defaults for checkboxes and the retention
policy.
4 Select an entity to monitor by clicking the Add button in the top portion of the Monitor
Options
screen. For an interface monitor, select Interface as the Type at the top of the screen.
You can also filter the list of interfaces that appear further by selecting
Interface Type as ge
(gigabit ethernet), for example.
NOTE:
Notice that you can add refinements like filtering on Administrative State and IP Address to the filter.
5
Select interfaces (Ctrl+click to add more than one), then click Add Selection then Done to
confirm your entity. Hover your cursor over a line describing an interface to have a more
complete description appear as a popup.
6 Click Browse to display the MIB Browser. For the sake of this example, we elect to monitor
ifInErrors (in RFC Standard MIBs, RFC1213-MIB > Nodes > mib-2 > interfaces > ifTable
> ifEntry > ifInErrors).
7 In the Thresholds screen, configure thresholds by first clicking Add.
8 Click Add above the threshold levels list for each threshold you want to add.
9 In the threshold editor, enter a name (Examples: Low, Medium, Overload ), an upper and
lower boundary, (0 - 10, 10 - 100, 100+), a severity (
Informational, Warning, Critical ) and
color (BLUE, YELLOW, RED). In this case, no string matching is necessary. When the data
crosses thresholds, the monitor reacts.
Attributes available depend on the type of monitor you are creating. Notice that you can also
check to make crossing this threshold emit a notification (an alarm that would appear on the
Alarm panel). You can also configure the type of calculation, and so on. You can even alter
existing thresholds by selecting one then clicking
Edit to the right of the selected threshold.
10 Click Apply for each threshold interval you configure, then Apply for the entire threshold
configuration.
If a threshold’s counter is an SNMP Counter32 (a 32-bit counter) monitoring can exceed its
capacity with a fully utilized gigabit interface in a relatively short period of time. The defaults
configured in this monitor account for this, but if you know that this is an issue, you can
probably configure the monitor to account for it too.