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View Global Node: View and control detailed information available on the Global Node (GN)

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The goal of this exercise is to introduce you to what the GENI Desktop and GEMINI refer to as that Global Node (GN). The GN is an extra node (VM) that is automatically added to your slice when you select the GEMINI extensions in Flack (or manually add the GEMINI extensions into an RSPEC). The purpose of the GN is to be the collection point for all instrumentation and measurement data collected by the slivers. Since slivers may be in different aggregates, there is one GN per aggregate. Each GN only collects data from slivers in its aggregate. This localizes communication, thereby minimizing interference of the I&M data collection mechanism with the running experiment. It also provides a centralized location(s) where users can go to find detailed information coming from the slivers in an aggregate.

In this exercise you will use the GENI Desktop to connect to the GN an view additional live graphs and tables not directly available via the GEMINI graphs view used in the previous exercise. You will also be shown how to view detailed packet captures using wireshark. Lastly, you will learn to X-based applications, and configure the data collection.

Access a Global Node

In order to access global node information, click the launcher icon and select the Global Node items from the launcher menu . This will create a button that will allow you to see or configure global nodes.

A topology may have multiple Global Nodes (GNs), one per aggregate. Although the GNs appear in the logical and geographic views of the topology, it is not immediately obvious which slivers (nodes) are managed by each of the GNs. Consequently, to find the GN for any particular node in the topology, one can select the desired sliver (node) and then click on the live view button.

Viewing packet traces

To view packet traffic traces,

Access X-based Applications

say something

Configure and Manage the GN(s)

talk about configuration

Exercise Tasks

  1. Task 1: Bring up a window to view the GN.
  2. Task 2: Find the routing table for VM-1.
  3. Task 3: Bring up wireshark and capture all packets flowing between VM-0 and VM-2.

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