How to get the link utilization information of an entire topology

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viknes indiran

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Jun 12, 2022, 8:56:54 PMJun 12
to sFlow-RT
Good day,

Is there any way to get the link utilization metric information of all of links in an topology?

Thanks.

Peter Phaal

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Jun 12, 2022, 11:04:04 PMJun 12
to sFlow-RT
There are a number of options in the REST API depending on how you want to use the data:
http://localhost:8008/dump/ALL/ifinutilzation,ifoututilization/json

You can also query the data from an embedded JavaScript program using equivalant functions, https://sflow-rt.com/reference.php#script

viknes indiran

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Jun 13, 2022, 3:43:41 AMJun 13
to sFlow-RT
Hi Peter,

I used the first option and I got this output.

 {
  "metricValue": 8.064403220161009E-6,
  "agent": "127.0.0.1",
  "metricName": "ifoututilization",
  "dataSource": "130",
  "lastUpdate": 14817
 },
 {
  "metricValue": 7.1E-6,
  "agent": "127.0.0.1",
  "metricName": "ifoututilization",
  "dataSource": "132",
  "lastUpdate": 6816
 },
 {
  "metricValue": 0,
  "agent": "127.0.0.1",
  "metricName": "ifoututilization",
  "dataSource": "147",
  "lastUpdate": 9817
 },
 {
  "metricValue": 7.1E-6,
  "agent": "127.0.0.1",
  "metricName": "ifoututilization",
  "dataSource": "129",
  "lastUpdate": 817
 }

My aim is to get the link utilization metrics and the switch links associated with it. For example:

metricValue: 0.12
switchLink: s1-s2

metricValue: 0.14
switchLink: s2-s3

How to get an output similar to this example? 

Thank you.  

Peter Phaal

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Jun 13, 2022, 10:21:39 AMJun 13
to viknes indiran, sFlow-RT
It sounds like you are using Mininet? 

If you install the Mininet Dashboard, https://blog.sflow.com/2016/05/mininet-dashboard.html, then you can query to top interfaces through the dashboard REST API. It would be easy to modify the dashboard application script, sflow-rt/app/mininet-dashboard/scripts/metrics.js, and add a query to report on all interfaces.

FYI The utilization values reported by sFlow don't mean much on Mininet since the virtual interfaces don't have a speed so Open vSwitch reports a default 10G for the ports. You can compute meaningful utilization numbers if you set link bandwidths, get the bits per second traffic rates on the port, and divide by the configured bandwidth (10Mbits/s in the examples in the Mininet Dashboard article).

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