Scott,
> As an endpoint, you are interested in reachability of specific
> endpoints. You don't care if a whole prefix is reachable, if the
> particular endpoint isn't reachable within that prefix. So if you
> delegate liveness monitoring to an agent, you are asking it to monitor
> specific locators.
The e2e principle seems to make it clear that, ultimately, liveness is
the endpoint's responsibility, but that is usually interpreted as a
statement about what the transport layer or above should do. And they
already do it, 100% independently of what we do in layer 3 and below.
I think that limiting layer 3 liveness detection to the prefix level
(except presumably in the case of Mobile IP) is a perfectly good
engineering compromise, unless we're planning to repudiate [Saltzer].
Brian
[Saltzer] End-To-End Arguments in System Design, J.H. Saltzer,
D.P.Reed, D.D.Clark, ACM TOCS, Vol 2, Number 4, November 1984, pp
277-288.
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