[FROG] bgpd as0 rfc7607 compliance

Seems to be finding plenty of these AGGREGATOR attribute is BGP_AS_ZERO(0) However, rfc7607 specifies error handling as per rfc7606 which suggests most frequently the withdrawn treatment bgpd appears to instead proceed for ebgp peers and notify for ibgp sessions, I am curious as to how either of these are correct and would appreciate any advice on the matter. Frustratingly, I haven't figured out any good way to log which prefix update are triggering this. Best, Joe