set protocols ospf external-preference 175 # if you are trying not to override BGP default route - corner case
set protocols ospf export default-originate
set protocols ospf reference-bandwidth 40g

set protocols ospf3 external-preference 175 # if you are trying not to override BGP default route - corner case
set protocols ospf3 export default-originate
set protocols ospf3 reference-bandwidth 40g

set policy-options policy-statement default-originate term 1 from family inet
set policy-options policy-statement default-originate term 1 from route-filter 0.0.0.0/0 exact
set policy-options policy-statement default-originate term 1 then accept