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Transcript for this video

Mini Maxwell has a special automation feature that allows you to sequentially step through impairment settings.

In this Flash video, we will emulate increasing packet loss rate, a very common occurrence on real-world networks. We will examine the effects on our device in the face of this very common network occurrence.

We want to learn how our device will behave when packet loss increases.

In our automation directory, we will double-click on the file named “mmauto.ods.” Or, from the command line, we will type “ooffice mmauto.ods &”

We will enable macros with a “Medium” security setting.

We will enter the hostname or IP address of our Mini Maxwell device and press the enter key.

Then, we will click on the “validate address” button. It should come back as green after a few seconds.

The automation feature begins by telling the Mini Maxwell to establish a baseline setting of impairment values.

Then, the automation feature begins to cycle through a sequence of program steps.

Each step defines a set of impairment values and a period of time before moving onto the next step.

When all steps are done, the automation feature will begin a new cycle with the first step.

Now let’s see how this is done.

We will start at a baseline value.

We can put different impairments for different types of traffic in different bands.

But to keep this simple, we will only use band 5.

We will slowly increase packet delay over a 60 second period.

We will do this over four intervals.

Then we will return to the initial set of impairments in step 1.

At the bottom of the screen, we will click on the “baseline” tab.

The baseline settings define our beginning conditions.

Now what we want to do is have the packet loss or drop rate increase as a series of steps, each lasting 15 seconds for a total of 60 seconds.

The baseline default is no impairments.

Now we will click on the “step 1” tab at the bottom of the screen.

We will begin each cycle with step 1.

Step 1 will include no impairments.

We want this step to persist for 15 seconds.

In order to do this, we give the post-step wait a value of 15.

Then check “enable this step.”

Now we will click on the “step 2” tab at the bottom of the screen.

We want this step to persist for 15 seconds. In order to do this, we give the post-step wait a value of 15.

We will check “enable this step” and enter 5% in the drop impairment for both LAN A to B and LAN B to A, so that 5% of all traffic in both directions will be dropped.

Now we click on the “step 3” tab at the bottom of the screen.

Again, this condition will persist for 15 seconds.

We enable this step and re-enter 10% in the drop impairment for both LAN A to B and LAN B to A, so that 10% of all traffic in both directions will be dropped.

Now we will click on the “step 4” tab at the bottom of the screen.

Again, this condition will persist for 15 seconds.

We enable this step and re-enter 15% in the drop impairment for both LAN A to B and LAN B to A, so that 15% of all traffic in both directions will be dropped.

We have now set up four steps, each lasting 15 seconds for a total of 60 seconds.

When the fourth step is completed, the automation will return to step 1.

We have now created these four steps with increasing drop-rate. Now we will go to the control tab and start the emulation.

We begin our network emulation by clicking on “start.”

Note the right-hand column shows the status which is running, the number of cycles completed, the current step number that is running, and the total elapsed time.

All these values will be increasing.

The cycle repeats every 60 seconds.

You can watch the progress of the emulation by viewing it from the Mini Maxwell web page.

Go to the bands and impairments and click on “refresh.”

Here you can see the drop percentage changing according to the step of the emulation. You must continue to click on refresh to see the change.

To stop the emulation, simply click on the stop button. Mini Maxwell will stop after it finishes the current step. You can save your configuration and step-up by saving the spreadsheet with a new filename.

By using the Mini Maxwell remote spreadsheet, you can drive Mini Maxwell through a series of impairments over a period of time.

This is very useful for observing the behavior of your device under changeable network conditions.


 

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