On Fri, 18 Feb 2011, Russ White wrote:
and because AS-Sets are opaque when it comes to security semantics
(which asn in the set is responsible for what part of the aggregate?)
they are excluded from the discussion, and on the road to deprecation.
The point wasn't to say, "can each of these be solved," it was to say,
"the AS Path wasn't designed to bear the weight you're putting on it."
I could go on giving examples, but to state, "BGP's semantic is that the
AS Path represents the path through which the update has traveled," is
simply untrue.
eh... but it is. one more time around the mulberry bush?
It's not. The AS Path is to prove the path is loop free. It was never
intended to prove where the update went in the network.
The AS_PATH has always been intended to represent the ASs that propagated
the update.
The AS_PATH can be used to detect loops ONLY because it does represent the
ASs that propagated the update.
--Sandy
:-)
Russ
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