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Replacement attempts are globally rate limited to one per 7*2^8 seconds to limit the rate of DNS requests for public servers like pool.ntp.org. If multiple sources are repeatedly attempting replacement (at their polling intervals), one source can be getting all attempts for periods of time. Use a randomly generated interval to randomize the order of source replacements without changing the average rate.
This is a collection of simulation tests using the clknetsim simulator (supported on Linux only). https://github.com/mlichvar/clknetsim The CLKNETSIM_PATH environment variable should point to the directory where clknetsim was downloaded and compiled. If the variable is not set, the tests will look for clknetsim in ./clknetsim in the current directory. The tests are written in bash and they can be run directly. The ./run script runs all tests.