Based on vague wording what are the rules when using local-as or no-export.
For example, do not propagate the AS outside of this AS. Both would work right.
local-as = local as only
no-export = do not sent to any as.
It depends. If you aren't doing BGP confederations, then both options would work. If you are using BGP confederations, local-as prevents the routes from traversing the sub ASes. No-export allows the routes to go between sub-ASes in the confederation, but not to any other ASes outside of the confederration.