Examples of Time-Based Threshold Monitoring
There are two alternatives for configuring these example thresholds in NNMi:
- Just provide a few settings (Configure Time-Based Threshold Monitoring for Node Groups and Configure Time-Based Threshold Monitoring for Interface Groups).
- Use the Custom Poller configuration and polling policies to create the required logic (Create Custom Polling Configurations).
Several Time-Based Threshold Settings examples are presented. These examples are not intended to be recommendations. Consider all aspects of your network environment and set performance thresholds that are meaningful in your environment.
Example 1: Monitor CPU Utilization for an Important Node
You want to know when the CPU Utilization is above 75% for 20 out of 30 minutes. A High Threshold situation occurs when the CPU Utilization exceeds 75% for 20 out of 30 minutes and returns to normal when the Utilization drops below 70%.
High Value: 75%
High Value Rearm: 70%
High Duration: 20 minutes
High Duration Window: 30 minute
Polling Interval: 5 minutes
Example 2: Monitor Important Interfaces for Interface Input Utilization
You want to know when the Bandwidth Utilization is above 90% for 30 out of 30 minutes. A High Threshold situation occurs when the bandwidth utilization exceeds 90% for 30 out of 30 minutes and returns to normal when the utilization drops below 80%.
High Value: 90%
High Value Rearm: 80%
High Duration: 30 minutes
High Duration Window: 30 minutes
Polling Interval: 5 minutes
Example 3: Monitor Using Rearm Values
You want to reduce the frequency of interface State changes when the polled value is close to the threshold.
The first example shows the Performance Polling results with High Value Rearm set to 80% (same percentage as the threshold).
High Value: 80%
High Value Rearm: 80%
High Duration: 10 minutes
High Duration Window: 15 minutes
Polling Interval: 5 minutes
The second example shows the same set of Performance Polling results with High Value Rearm set to 50%.
High Value: 80%
High Value Rearm: 50%
High Duration: 10 minutes
High Duration Window: 15 minutes
Polling Interval: 5 minutes
Example 4: Monitor Important Interfaces for Interface Errors
You want to know when the Interface Errors are above 10% for 15 out of 20 minutes. A High Threshold situation occurs when the interface errors exceed 10% for 15 out of 20 minutes and returns to normal when the interface errors drops below 5%.
High Value: 10%
High Value Rearm: 5%
High Duration: 15 minutes
High Duration Window: 20 minutes
Polling Interval: 5 minutes
Example 5: Monitor Important Interfaces for Interface Discards
You want to know when the Interface Discards are above 10% for 30 out of 45 minutes. A High Threshold situation occurs when the interface discards exceed 10% for 30 out of 45 minutes and returns to nomral when the interface discards drop below 5%.
High Value: 10%
High Value Rearm: 5 %
High Duration: 30 minutes
High Duration Window: 45 minutes
Polling Interval: 5 minutes
