RFC 2328, "OSPF Version 2", April 1998Source of RFC: ospf (rtg)
Errata ID: 5684
Reported By: jonathan natale
Date Reported: 2019-04-04
Rejected by: Alvaro Retana
Date Rejected: 2019-06-28
Section 9.4 says:
These two alternatives (~=">=1 BDRs" vs. ~="no BDRs") seem (to me at least, maybe I missed the point) to have the same outcome (~="highest becomes BDR")--please clarify it: If one or more of these routers have declared themselves Backup Designated Router[alternative1] (i.e., they are currently listing themselves as Backup Designated Router, but not as Designated Router, in their Hello Packets) the one having highest Router Priority is declared to be Backup Designated Router. In case of a tie, the one having the highest Router ID is chosen. If no routers have declared themselves Backup Designated Router[alternative2], Moy Standards Track [Page 75] RFC 2328 OSPF Version 2 April 1998 choose the router having highest Router Priority, (again excluding those routers who have declared themselves Designated Router), and again use the Router ID to break ties.
It should say:
It is unclear to me if a BDR should get preempted (I know the BDR should not).
The confusion was cleared on the WG list.