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Understanding the AM API using Named Data Networking
4 Wait for resources to be ready
You can tell whether your nodes are ready by using a script built on omni
called readyToLogin
.
-
Please use the command:
readyToLogin -a AM_NICKNAME LabOne
where (as before) AM_NICKNAME and LabOne are your aggregate manager nickname and your slice name (both found on your worksheet).
- If it reports that the sliver is not yet ready (for example, it might say that the status is "changing"), then wait a minute
or two and try again. Once everything is complete, readyToLogin
will give output that should look something like this:
... rschr's geni_status is: ready (am_status:ready) User example logs in to rschr using: ssh -p 32768 -i /Users/example/.ssh/geni_key_portal example@pc1.utah.geniracks.net User example logs in to collar using: ssh -p 32769 -i /Users/example/.ssh/geni_key_portal example@pc1.utah.geniracks.net ...
5 Trying out the NDN application
In this experiment, you will be able to see the NDN in-network caching in action. Our experiment consists of the following nodes:
- A data source node, called
Custodian
that holds data in the namespace /nytimes - A internet router node, called
Internet
that forwards Interest and Data packets to and from the custodian. - A university hub node, called
University
that forwards Interest and Data packets to and from the university nodes. - A principal investigator node, called
PI
and a experimenter node, calledExperimenter
that will issue Interest requests.
Download the scripts and Python codes to your computer and extract it.
Or alternatively,
$ wget http://192.1.242.151/files/ndn-tutorial.gz $ tar -xvf ndn-tutorial.gz
In the ndn-tutorial-config.sh configuration file, edit the fields according to your GENI username, SSH key, GENI Aggregate name, pc and port numbers. Keep the quotes format unchanged, otherwise the script may not run.
Run copy-scripts.sh, this will automatically transfer the necessary files to the nodes in our topology.
Login into the node Custodian and start the NDN Forwarding Daemon (NFD),
$ nfd-start
wait until the shell prompt returns (~ a few seconds). The NFD is now up and running.
5.1 Run the NDN application on the same node
$ python producer.py -n /nytimes
On another terminal, run
$ python consumer.py -u /nytimes/science
5.2 Run the NDN application on the entire topology
5.3 (Optional) Visualize experiment data flows
To use the GENI Desktop to visualize the data flows in your network, continue with the instructions here.