Re: [rrg] Let me see if I can summarize my concern with Locator Liveness

[David Meyer <[e-mail]>]

> Dave is correct though that this assumes an engineering tradeoff;
> but surely we don't have to design for the worst case as if it
> was the typical case?

	I agree with that. The concern (at least to me) is that
	if you don't somehow assess whether a locator is
	reachable, these schemes have the potential to latch on a
	"down locator" (initially, or after a failure), and that
	can cause a persistent failure. That failure is a new
	failure mode for the Internet.  

	I'm also guessing that the procedure used to asses
	locator liveness can use hints to avoid the asymptotic
	bound (at least I would hope so). The "Possible
	Optimizations" section of the draft outlines a few of
	these. 

	I'll just note here that I'm not the only one concerned
	with this property of loc/id split; draft-ietf-shim6-failure-detection
	is designed to address exactly this concern. 

	Dave
 

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