BFD, it’s used for millisecond failure detection and typically combined with BGP sessions (tcp based) to ensure seamless failover without packet drops.
Reminds me of an extremely similar case with a long distance microwave link at a mobile telecom provider in Australia that I worked for. They relied quite heavily on microwave link chains and this particular one was in northern Queensland where fixed lines were hard to find and no local engineers were locally present/aware of the changing environment.
Every week day + Saturday, from 7-3 the link would keep cutting out intermittently. Then work fine and the rest of the day and on Sunday… a crane, building a new residential building would operate during those hours right in the middle of the microwave path. Many weeks of theories and time wasted until someone had a chance to visit. :)
BFD, it’s used for millisecond failure detection and typically combined with BGP sessions (tcp based) to ensure seamless failover without packet drops.