[Comment removed by author]
That puts Hákarl over pineapple.
Probably a correct move.
Would someone mind explaining in laymen terms what exactly BFD does? I saw the wiki article… still not sure I really understand what is going on.
One use case is peering.
You have a router which connects to a switch, and your peers connect their routers to the same switch.
If any of your peers go down, you want to notice quickly (in the order of miliseconds) and adjust your routing table accordingly, so that traffic is routed only through peers which are alive and packet loss is minimized to a very very low degree.
A quick enough indicator is interface link state provided by network hardware.
This can be used for peers attached with a direct cross-over-cable Ethernet connection.
However, if you’re plugged into a switch the switch port will keep your link state up and you cannot see your peer’s link state on a different switch port going down.
BFD solves this by tracking link state between two interfaces independently of an underlying link state indicator.