Steven,
If the cache is within your domain the below sentence does not apply as
you are not validating your IGP routes to bootstrap a router's
reachability to a cache.
If the cache would be outside of your domain this sentence would apply
as you would require to accept and install some set of essentially "NOT
FOUND" routes to reach the cache.
Therefor if authors of draft-ietf-sidr-rpki-rtr-XX are really serious
about recommending to keep the cache locally within each domian the
below sentence you are quoting should be fixed or removed.
Rgs,
R.
Let me call attention to this sentence, too:
It also SHOULD be
topologically close so that a minimum of validated routing data
are needed to bootstrap a router's access to a cache.
That is, there are other, quite important, reasons to keep the cache
very close to the router(s) it serves.
--Steve Bellovin, https://www.cs.columbia.edu/~smb
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