Even if a longer prefix like a /24 is announced, chances of people accepting it is slim. Especially, as you say, if the RIR allocation is something larger than /24
And I have a feeling acceptance /24 route announcements of anything other than legacy classful space, infrastructure space like the root servers is going to be patchy at best. 2008/12/19 Darryl Dunkin <ddun...@netos.net>: > > If you are allocated a /22, announce the /22. Do not announce anything longer > unless you have a requirement to (such as a different origin AS). If you are > further allocating a subset of that to a downstream, then a /24 out of that > is acceptable as the origin will be different. >