I have a coupe of questions.
Question 1:
It seems this draft proposes Changes to the BGP Decision Process (Section 3).
It is not clear that the decision process behavior described in this ID can be
implemented
by manipulation of the existing policy knobs.
What is described seems to be an addition to the decision process, not just
policy tricks.
I am wondering if that is acceptable?
Question 2:
The I-D is proposing to explicitly work with
"validation state" 0 (valid), 1 (not found), and 2 (invalid)
in the BGP Decision Process.
One thing I am not clear about the proposal is how can this proposed
order of actions work?
a. Validation step: "When comparing a pair of routes for a BGP destination,
the route
with the lowest "validation state" value is preferred."
b. "the validation step MUST
be performed prior to any of the steps defined in the decision
process of [RFC4271]."
As I see, at first the decision process has to select from available paths
the candidates for best path (including policy considerations, etc.);
it then makes an ordered list of the candidates; then it can apply the rule of
"the lowest "validation state" value is preferred."
Seems to me that it is not possible the other way round that the I-D seems to
require (MUST)?
Sriram
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