Specifically with regard to the presentation on Measurement Data on AS_SET
and AGGREGATOR: Implications for {Prefix, Origin} Validation Algorithms:

When an AS_SET is present in a BGP Update, it isn't required that it is the
right-most segment type.  While this is certainly the most typical scenario
and supported by most implementations, it's not mandated by the spec.  

See RFC 4271, Sec F.6.

I somewhat suspect that as RPKI becomes more widely deployed that there will
be somewhat greater motivation to support more complex aggregation.
(Or at least as much pressure customers announcing 0.07% of the internet's
prefixes are willing to assert with their pocket books.)

John S. seemed to have slightly different thoughts and he will probably
follow-up.

-- Jeff
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