Sriram, Kotikalapudi (Fed) wrote on 19/07/2022 22:24:
Question: Operationally, is an AS_SET ever used in the*middle*
between AS_SEQUENCEs? Or, should one simply give zero credence to
it?
tl;dr: epsilon levels of credence.
in the context of EBGP connectivity, on the internet, having an AS_SET
in the middle of a sequence means that whoever is responsible for
leaking that is exposing far more about their internal sausage factory
than I ever want to know. There could possibly be valid reasons, but
it's far more likely that this is the outcome of temporary or simply
poor quality routing policies.
ASPA somewhat assumes a naive/simplistic routing policy. Having AS_SET
support of this style means that it's entertaining a far greater level
of complexity than ASPA's target network might operate. There are echoes
of the DNS camel here.
Nick
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