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The BYNET gets its name from the Banyan tree. The Banyan tree has the ability to continually plant new roots to grow forever. Likewise, the BYNET scales as the Teradata system grows in size.

All communication between PEs and AMPs is done via the BYNET.
When the PE dispatches the steps for the AMPs to perform, they are dispatched onto the BYNET.The messages are routed to the appropriate AMP(s).
Each AMP or PE can use one BYNET to retrieve communication and simultaneously accept messages using the other BYNET. Both BYNETs can be used to send a message or to receive a message!

TeradataWiki-Teradata BYNET

The BYNET has several unique features:

Scalable: As you add more nodes to the system, the overall network bandwidth scales linearly. This linear scalability means you can increase system size without performance penalty -- and sometimes even increase performance.

High performance: An MPP system typically has two BYNET networks (BYNET 0 and BYNET 1). Because both networks in a system are active, the system benefits from having full use of the aggregate bandwidth of both the networks.

Fault tolerant: Each network has multiple connection paths. If the BYNET detects an unusable path in either network, it will automatically reconfigure that network so all messages avoid the unusable path. Additionally, in the rare case that BYNET 0 cannot be reconfigured, hardware on BYNET 0 is disabled and messages are re-routed to BYNET 1.

Load balanced: Traffic is automatically and dynamically distributed between both BYNETs.

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