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

[Bruce Pinsky]

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John Neiberger wrote:
> 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?
> 

fall-over basically tears down the peering session as soon as reachability
to the peering address is lost.  It is event-driven rather than timer based
session deactivation.  The issue with the feature is that there is no
delay/dampening method and so a momentary loss of reachability can result
in the peer(s) being torn down.


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bep

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