As well all of a advertised block must me advertised
only from a single asn.
This is where this will start to get tricky.
No that's not quite true. Though it's not common practice there's nothing
that prevents you from announcing de-aggregated prefixes from other ASNs.
--
Antonio Querubin
e-mail: tony(a)lavanauts.org
xmpp: antonioquerubin(a)gmail.com