How are you configuring BFD timers?

[jason+nanog at lixfeld.ca (Jason Lixfeld)]

Hey,

For those running BFD on your land-based point-to-point links, Iâ??m interested in hearing about what factors you consider when deciding how to configure your timers and multiplier.

On paper, BFD between two devices over a local or metro dark fibre or wave seems pretty trivial:  Assuming your gear can a) support echo mode b) hardware offloads echo processing c) automatically treats echos as vital and puts them into the appropriate high priority queue, then setting the timers down to their lowest possible values (3ms on some of the gear that Iâ??ve seen) and some low multiplier seems more than reasonable.  But?