nested prefixes in Internet

Niels Bakker niels=nanog at
Mon Nov 21 12:01:33 UTC 2016

* vas at (Victor Sudakov) [Sun 20 Nov 2016, 03:07 CET]:
>I have reports that in case (2), some operators (e.g. Rostelecom) 
>don't accept the /24 or even /23 prefix on the grounds that it is 
>part of a larger /19 route already present in the routing table.
>Could they have a reason not to accept these more specific prefixes 
>other than a whim?

If you announce a prefix you must deliver traffic sent to addresses 
covered by it.  You don't go announcing to your peers either.

If a customer takes a /24 and announces it elsewhere, a transit 
provider runs the risk of accepting inbound traffic without having 
the possibility to bill their customer for it if it accepts more 
specifics from e.g. a peer.

	-- Niels.

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