wiki:PathControllerDemo

Path Controller

As an example experiment, we have set up a Path Controller tool. Click on the link or goto http://geminiportal.uky.emulab.net/path_controller . Accept the self-signed certificate.

Logging On

Log on using the information on your handout.

The tool consist of a web interface that connects to the slice's nodes and allows you to change the routing paths and generate traffic between selected nodes. The interface has desktop-like windows that can be moved around and resized as you please.

Topology Window

The first window we will examine contains the slice's topology.

Each circle represents a node in the network. The lines represent links. Note that the global node (GN) does not have links, it acts in the background. Left click and drag a node to rearrange them. For this tutorial arrange them so they match the geminiportal layout like so:

As you rearrange the nodes, note the window directly below the topology window. This is the information (Info) window.

Info Window

This window has some brief information about the node or link that the cursor is currently over. This case has information about VM-1. The icon represents a virtual machine. The hostname is pcvm63-2.uky.emulab.net.

This next case is for lan1. The icon represents a link. The ids are displayed for the two end points, along with each interface's ip address.

Create Traffic

Traffic Generator

The window with the button is the Traffic Generator. Click the button to add a Traffic Generator.

The Traffic Generator has a traffic source (Src) node and destination (Dst) node, both of which must be set. The File Size defaults to 500MB and can be anything from 1 to 1000MB. To set the Src or Dst, left click on the desired node. Once the node is highlighted, click on the or to set your choice. Set the traffic from Src VM-1 to Dst VM-4.

Start the traffic by clicking the button. The button color will pulse and the text will change to Transferring while the transfer is in progress.

View Default Traffic (lan1) on Gemini Portal

Switch to Gemini Portal tab in the browser. Left click on the link line that connects VM-1 to VM-4. This brings up the Graph Control for lan1. Check the checkbox for linkoctets.

The interface traffic graphs for both ends of the lan1 will be added to the left side of the page. Mouseover the graph to enlarge for a better view. Since we started a transfer using the Traffic Generator, we see a burst of traffic on these graphs. The green bars represent incoming traffic. The blue lines represent outgoing traffic.

Add Custom Route (lan3, lan5, lan4)

Switch back to the Path Controller tab in your browser.

Traffic Path

The Traffic Path window allows you to add custom routes to the slice.

The button adds a new path based on the links that are selected in the topology window. The button will reset the slice back to its default routes.

As we saw earlier, the default route between VM-1 and VM-4 follows the direct route via lan1. Now we will alter that route. Set the path from VM-1 to VM-4 to follow links lan3, lan5, lan4. Do this by left clicking on the links while holding the shift key. Once the three links are selected, click the button. The results should look like this:

Start traffic between VM-1 and VM-4 by pressing the button.

View Custom Path on lan4 in Gemini Portal

Switch to Gemini Portal tab in the browser. Click on the link connecting VM-3 to VM-4. Check the linkoctets checkbox to add the traffic graphs for lan4 to the left side of the window.

Since we added the custom route through lan4 we now see the traffic crossing lan4 instead of lan1.

Add Custom Route (lan3, lan0)

Switch back to the Path Controller tab in your browser.

Set the File size to 1000MB. Start traffic by pressing the .

Now add another path (in addition to the existing path) between VM-1 and VM-4 that follows links lan3 and lan0.

View Custom Path Switch from lan4 to lan0

Switch to the Gemini Portal tab in the browser.

Looking at the graphs for lan4 and lan0, you will see the traffic start on lan4. After the path was added through lan3, lan4, you will see the traffic drop off lan4 and move to lan0.

Details of lan4 and lan0 traffic graphs showing the switch of traffic.

Reset All Custom Paths

Switch back to the Path Controller tab in your browser.

Click the by each path to remove them. Or, click the to remove all the paths in one step.

As an exercise left to you, check that traffic will once again default to lan1.

Last modified 7 years ago Last modified on 10/21/12 22:26:02

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