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Re: failure detection
On Thu, 18 Aug 2005, marcelo bagnulo braun wrote:
so far this is exactly what is contained in Iljitsch draft, Jari's
draft and this is the basic concesous we have so far as i
understand it.
Well, unless I'm reading the wrong draft (the one Iljitsch did the
presentation on at IETF?), my understanding of the draft is that
it explores the various possible solutions and discusses some the
considerations, but does not draw a conclusion.
So yes, I'm rehashing things in that draft, but I'm trying to focus
the discussion by discounting some of the possible solutions (or at
least relegating them to "implementation discretionary" and
concentrate on specifics ;).
Is my understanding correct?
At this point, what we are discussing is how this monitoring
mechanism should look like
Ok, good.
and how this ULP feedback should look like
I would discount this from consideration, other than to ensure any
mechanism allows an implementation to make use of local positive
feedback for optimising things.
- You can't mandate a shim6 implementation /must/ send probes
regularly, to allow other side to use for reachability detection
not sure what you mean here....
You can't have one side expect to get regular 'pings' in order to
determine reachability, otherwise local-positive-feedback to suppress
probes/keepalives/pings/whatever-you-call-them would not be possible.
if you are saying that ULP feedback could result in avoiding shim probing,
then i agree and this is exactly what we have been cosnidering
Great.
We have also agreed that failure detection need to be unidirection,
the discussion now is whether the proposed mechanisms are actually
unidirectional or whether they have an underlying bidirectional
assumption
Unidirectional would, I guess, require that all the information
needed to setup a shim is available in one message.
regards,
--
Paul Jakma paul@clubi.ie paul@jakma.org Key ID: 64A2FF6A
Fortune:
Faith is under the left nipple.
-- Martin Luther