Related Documentation
Monitoring RPM Probes
The RPM information includes the round-trip time, jitter, and standard deviation values for each configured RPM test on the device. To view these RPM properties, select Troubleshoot>RPM>View RPM in the J-Web user interface, or in configuration mode enter the show command:
In addition to the RPM statistics for each RPM test, the J-Web user interface displays the round-trip times and cumulative jitter graphically. Figure 1 shows sample graphs for an RPM test.
Figure 1: Sample RPM Graphs
In Figure 1, the round-trip time and jitter values are plotted as a function of the system time. Large spikes in round-trip time or jitter indicate a slower outbound (egress) or inbound (ingress) time for the probe sent at that particular time.
Table 1 summarizes key output fields in RPM displays.
Table 1: Summary of Key RPM Output Fields
Field | Values | Additional Information |
|---|---|---|
| Currently Running Tests | ||
Graph | Click the Graph link to display the graph (if it is not already displayed) or to update the graph for a particular test. | |
Owner | Configured owner name of the RPM test. | – |
Test Name | Configured name of the RPM test. | – |
Probe Type | Type of RPM probe configured for the specified test:
| – |
Target Address | IP address or URL of the remote server that is being probed by the RPM test. | – |
Source Address | Explicitly configured source address that is included in the probe packet headers. | If no source address is configured, the RPM probe packets use the outgoing interface as the source address, and the Source Address field is empty. |
Minimum RTT | Shortest round-trip time from the Juniper Networks device to the remote server, as measured over the course of the test. | – |
Maximum RTT | Longest round-trip time from the Juniper Networks device to the remote server, as measured over the course of the test. | – |
Average RTT | Average round-trip time from the Juniper Networks device to the remote server, as measured over the course of the test. | – |
Standard Deviation RTT | Standard deviation of round-trip times from the Juniper Networks device to the remote server, as measured over the course of the test. | – |
Probes Sent | Total number of probes sent over the course of the test. | – |
Loss Percentage | Percentage of probes sent for which a response was not received. | – |
| Round-Trip Time for a Probe | ||
Samples | Total number of probes used for the data set. | The Juniper Networks device maintains records of the most recent 50 probes for each configured test. These 50 probes are used to generate RPM statistics for a particular test. |
Earliest Sample | System time when the first probe in the sample was received. | – |
Latest Sample | System time when the last probe in the sample was received. | – |
Mean Value | Average round-trip time for the 50-probe sample. | – |
Standard Deviation | Standard deviation of the round-trip times for the 50-probe sample. | – |
Lowest Value | Shortest round-trip time from the device to the remote server, as measured over the 50-probe sample. | – |
Time of Lowest Sample | System time when the lowest value in the 50-probe sample was received. | – |
Highest Value | Longest round-trip time from the Juniper Networks device to the remote server, as measured over the 50-probe sample. | – |
Time of Highest Sample | System time when the highest value in the 50-probe sample was received. | – |
| Cumulative Jitter for a Probe | ||
Samples | Total number of probes used for the data set. | The Juniper Networks device maintains records of the most recent 50 probes for each configured test. These 50 probes are used to generate RPM statistics for a particular test. |
Earliest Sample | System time when the first probe in the sample was received. | – |
Latest Sample | System time when the last probe in the sample was received. | – |
Mean Value | Average jitter for the 50-probe sample. | – |
Standard Deviation | Standard deviation of the jitter values for the 50-probe sample. | – |
Lowest Value | Smallest jitter value, as measured over the 50-probe sample. | – |
Time of Lowest Sample | System time when the lowest value in the 50-probe sample was received. | – |
Highest Value | Highest jitter value, as measured over the 50-probe sample. | – |
Time of Highest Sample | System time when the highest jitter value in the 50-probe sample was received. | – |
