In OSPF External Routes , when the router choose based on
(the lowest area ID)
or based on (the Non-backbone area vs. backbone area vs. inter-area)
or based on the (lowest total cost to the ASBR/Forwarding address)
or based on the (lowest seed metric)
or based on (the formula in RFC 1583 which is X+Y)?
and does all these variations are done in RFC2328 ONLY ? or its done in both RFC 1583 and RFC 2328 ? and does these variations are done to the O E
s ONLY ? or both to O Es and O N
s