  Ethernet has become the next standard for automotive and industrial
automation networks. Standard extensions such as IEEE 802.1Q Time-Sensitive
Networking (TSN) have been proven to meet the real-time and robustness
requirements of these environments. Augmenting the TSN switching by
Software-Defined Networking functions promises additional benefits: A
programming option for TSN devices can add much value to the resilience,
security, and adaptivity of the environment. Network simulation allows to model
highly complex networks before assembly and is an essential process for the
design and validation of future networks. Still, a simulation environment that
supports programmable real-time networks is missing. This paper fills the gap
by sharing our simulation model for Software-Defined Networking for
Communication over Real-Time Ethernet (SDN4CoRE) and present initial results in
modeling programmable real-time networks. In a case study, we show that
SDN4CoRE can simulate complex programmable real-time networks and allows for
testing and verifying the programming of real-time devices.
