* Clement Cavadore:
- Am I allowed to announce a prefix more specific than my LIR's /32 (originated from my ASN, not the LIR's one) ?
This is really the LIR's call because it's within their prefix. There are no other rules regarding prefix announcements.
- If I can announce a more specific prefix, do I have to announce a couple of /48s, or may I announce a single /47, originated from my AS ? If I can announce the /47, I assume the LIR has to create a route: object ?
Not necessarily. For IPv4, there are some folks who use RIR data to create filters, so having such an object would be beneficial. I don't know about the state of IPv6 filtering. A lot of operators likely discard anything longer than /32 in the RIR allocation space.
- Is there any recommendations I'd need to know for such a situation (except becoming LIR, which is not possible for us at the moment) ?
ARIN offers IPv6 PI space, perhaps you can get a /48 prefix which is supposed to be globally routable from them.