> > "Timer intervals configured, Hello 333 msec, Dead 1, Wait
> > 1, Retransmit 5"
>
> So what you're talking about is the "OSPF Support for Fast
> Hellos" feature from Cisco:
>
> http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fasthelo.html
>
>
> This feature combines the Hello Interval and Dead Interval,
> along with some enhancements that make it behave like BFD in
> a way.
>
> AFAICT, it's only supported in IOS (and perhaps, IOS XE).
> You can tweak both the Hello and Dead Interval timers in IOS
> XR, but they lack of the enhancements to enable fast
> detection.
>
> For IOS XR, yes, BFD is your best bet.
this holds true for any platform, fast hellos just don't scale.. so
please use BFD if you need to detect neighbour failures quickly.
oli
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