As Industrial Ethernet becomes more prevalent, there is a greater need for strategies that improve communication. Port Trunking (called Link Aggregation in the IEEE 802.3 specification) allows two or more physical links to be grouped with the resulting arrangement behaving as a single logical link, commonly known as a trunk.
All devices connected by a trunk must operate in full-duplex mode and at the same data rate. Adding more parts (links) in a trunk must operate in full-duplex mode and at the same data rate.
Trunks have been designed to be backward compatible with those devices which cannot participate in trunking "because of their inherent capabilities, management configuration, or the capabilities of the devices to which they attach."
If some method of path redundancy is in place, trunking gives the redundancy a very fast recovery time-typically under one second and very often just several milliseconds. When a link in a redundant trunk is lost, the remaining links immediately take over to keep the communication intact.
The implementation of trunking does not require any changes to the IEEE 802.3 frame format. Also, there is no requirement to modify existing higher-level protocols or application software.
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