What is Last Changed on Interface Configuration sub view

Products

• CA Spectrum

Issue/Introduction

How the "Last Changed" field in Interface component details, under Interface Configuration sub view is obtained.

Environment

Release : 20.2

Component : Spectrum Core / SpectroSERVER

Cause

The Last Changed depends on ifLastChange and sysUpTime attribute.

sysUpTimeInstance    1.3.6.1.2.1.1.3.0
ifLastChange    1.3.6.1.2.1.2.2.1.9.<interface_index>

The ifLastChange contains the value of sysUpTime at the time the interface entered its current operational state. 
If the current state was entered prior to the last re-initialization of the local network management subsystem, then this object contains a zero value. 
In that case, the Last Changed should have the same value as sysUpTime.
Otherwise, it should have the difference between the two attributes.

Resolution

Let's take next example:

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The first image show the value for this interface ifLastChange is 3511. This value is on TimeTicks

A timetick is a hundredth of a second, i.e. <num_seconds>/100.

So 3511 timeticks correspond to 3511/100 = 35 seconds.

As you can see from the second image, the System Up Time is 198 days + 22:40:07.

On the other hand the Last Change field value is 198 days + 22:39:32

That is exactly 35 seconds or 3511 timeticks after the System boot up,