[c-nsp] BGP neighbor fall-over vs BFD

[John Neiberger]

I was just reading a bit about next-hop tracking and neighbor fall-over and
now I'm a little confused about what fall-over actually does. The docs say
that it enables fast peering session deactivation, but I can't tell what
that really means. The wording in the docs makes it sound a lot like BFD,
but not exactly. In fact, fall-over can be used with BFD.

Can someone shed some light on this? What is fall-over really doing and
when might it be useful?

Thanks,
John