Please see attached review.










I am the assigned Gen-ART reviewer for this draft. For background on
Gen-ART, please see the FAQ at
<http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.

Please resolve these comments along with any other Last Call comments
you may receive.

Document: draft-ietf-sidr-roa-validation-10.txt
Reviewer: Brian Carpenter
Review Date: 2011-04-09
IETF LC End Date: 2011-04-18
IESG Telechat date: 

Summary:  Almost ready
--------

Minor issues:
-------------

> 3.  Applying Validation Outcomes to Route Selection
...
>      "valid" is to be preferred over
>      "unknown", which is to be preferred over
>      "invalid".
...
>   It is a matter of local routing policy as to the actions to be
>   undertaken by a routing entity in processing those routes with
>   "unknown" validity states.

That seems to leave open the possibility that an aggregated route (which
is by definition "unknown") would be rejected. Assuming that the various
separate routes that were aggregated together never reached this particular
router, the result would be a black hole. At the least, it seems that this
should be mentioned, even if it is an intentional possibility.

> 5.  Route Validation Lifetime
>
>   The "lifetime" of a validation outcome refers to the time period
>   during which the original validation outcome can be still applied.
>   The implicit assumption here is that when the validation lifetime
>   expires the routing object should be re-tested for validity.

OK, but shouldn't a previously "valid" route be downgraded to
"unknown" after the lifetime expires and until the validity has
been re-tested?

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