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Troubleshooting and Debugging

Installation Issues

Thrift Interface Connection Issue

There is a known issue with the behavioral-model Thrift interface (p4lang/behavioral-model#1367) that prevents the controller from connecting to the switches. Until this is fixed upstream, you must apply a patch to the behavioral-model repository during the p4-guide build installation process.

To apply the fix, navigate to the cloned behavioral-model directory (typically in your home folder or where the script downloads it), apply the patch, and recompile it:

cd ~/behavioral-model
curl -L https://github.com/p4lang/behavioral-model/pull/1367.patch | git apply
make
sudo make install
cd -

General Troubleshooting

  • Interfaces/namespaces already exist or Mininet refuses to start:
    • Run make stop
  • Logs/pcaps contain old data:
    • Run make clean
  • Unexpected behavior after changing P4 or pipeline configuration:
    • Run make clean-all
    • Run make run

Further Debugging

To debug the execution of the Mininet network, controller, and test execution, you can inspect the logs in the logs/ directory. You can control the log level by modifying the LOG_LEVEL variable in the Makefile. The available log levels are DEBUG, INFO, WARNING, ERROR, and CRITICAL.

Controller Logs

The controller will log its output to logs/controller.log. The controller will start a thread to control each switch in the Mininet network, and each thread will log its output to logs/c_<switch_id>.log.

Switch Logs

Additionally, each switch will log its output to logs/<switch_id>.log (Bmv2 output).

Table Population Logs

Finally, the populate_<switch_id>_tables.log files will contain the output of the convert_RF_and_populate_tables.py, and populate_forwarding_tables.py script for each switch. Here you will be able to find out whether the switch is running an inference model or not, and whether the tables were populated correctly.