Stephen,
Lets rephrase the question so that it's agnostic on the map/route issue:
2a. What's the maximum acceptable time in which one EID may be
inaccessible to another during change propagation due to a path
failure?
A second or two at most, ideally, because folks are going to try to run
VoIP over this system. The good news is that it's not "zero" or "50ms"
like it would have been a decade ago, as cell phones have conditioned
people to expect occasional audio loss they wouldn't have accepted when
accustomed to the general high reliability of the wireline PSTN.
All the work on MPLS and IP-based fast reroute shows that the best way
to deal quickly with link failures is to recover *locally*. Path failure
should be solved by the routing system and not affect the mapping
system. Let's not overload the mapping system...
Olivier
--
http://inl.info.ucl.ac.be , UCLouvain, Belgium
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