[c-nsp] necessity of nowadays

[Nick Hilliard]

Saku Ytti wrote:
> I couldn't agree more, as long as you have hardware liveliness
> detection and unidirectional link detection like you have on Ethernet,
> UDLD will just decrease your availability not increase. As it's
> control-plane feature and on timely transport of BPDU.
> Ethernet has RFI or remote-fault-indicator, it can assert when it sees
> line down, then on unidirectional link far end will get this RFI and
> go down also.

completely valid.  Except on wireless networks where the mtbf is
hilariously awful and UDLD will probably increase reliability by taking
flakey links out of service.

Nick