Re: network controls are necessary

[Bill Sommerfeld <sommerfeld@orchard.arlington.ma.us>]

> 1) The address pair does not work because there really is no connectivity 
> over that path.  In that case, presumably routing will catch up pretty 
> quickly.  

I'm curious about something like that can be made to happen..

That seems to require either that alternate paths with alternate
locators have to silently cover for each other..  (which appears to
have the layer-9 probloems of geographic addressing), or that
information about failure of (for instance) an individual link to a
site will "pretty quickly" propagate all the way across the network,
which seems hard to scale up..

Maybe we have different ideas about what "pretty quickly" means.

Maybe a site could withdraw the identifier->locator mapping when a
link is known to have lost connectivity, but that clearly limits
what can be done to cache identifier-locator mappings..

					- Bill