Utilization reports are showing more than 100% in graphs

Products

• CA Performance Management - Usage and Administration
• DX NetOps

Issue/Introduction

We are seeing utilization on interfaces above 100% in dashboard views.

Environment

Release : 20.2

Component : IM Reporting / Admin / Configuration

Cause

We report the speed that we get back from the SNMP MIB when we poll it.

If the speed is too low, the utilization calculations will be wrong.

Resolution

In this example, the device I am using does not have a speed mismatch.

1. Make sure that the device is using the correct vendor cert (high speed interface vs interface)
2. Check the displayed speed in the device details:

..

..

Open a shell to the DC that is polling this device and run:

snmpwalk -v 2c -c comm-string IP-address mib-2.interfaces

And in the results we see:

IF-MIB::ifDescr.9 = STRING: FastEthernet0/0.729

IF-MIB::ifSpeed.9 = Gauge32: 100000000

 

So the interface 0.729 is index 9, and the speed for index 9 is 100mbs (100000000)

So we have shown that the mib and the NetOps Portal view match.

 

What did you find?

If the mib is presenting the wrong information, we will use the wrong information.