At the most elementary level, you can look at the BYNET as a switched fabric that loosely couples all the SMP nodes in a multinode system, but the BYNET has capabilities that range far beyond those of a simple system bus.
The BYNET has high-speed logic that provides bi-directional broadcast, multicast, and point-to-point communication and merge functions.
A multinode system has at least two BYNETs. This creates a fault-tolerant environment and enhances interprocessor communication. Load-balancing software optimizes transmission of messages over the BYNETs. If one BYNET fails, the second can handle the traffic.