Ethernet Automatic Protection Switching (EAPS) is used to create a fault tolerant topology by configuring a primary and secondary path for each VLAN.
It was invented by Extreme Networks. The idea is to provide highly available Ethernet switched rings (commonly used in Metro Ethernet). Other implementations include Ethernet Protection Switching Ring (EPSR) by Allied Telesis, "Rapid Ring Protection Protocol" by Huawei/H3C, "ZTE Ethernet Smart Ring" (ZESR) by ZTE.
Read more about Ethernet Automatic Protection Switching: Operation, EAPS V2
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