About OSPF DR/BDR Routers.
If a link like the one on the top left corner goes down, the router will let the DR and BDR know by generating a Link-state Update Message and sending it using the multicast address 184.108.40.206 and then the DR will forward this information to other routers using the multicast address 220.127.116.11. Since DROTHER routers (the bottom routers) only have a two-way neighbor state with eachother, they wouldn't try to forward any LSUs to their two-way neighbors to let them know what happened, thus eliminating unecessary congestion.
However, would they try to generate and forward a LSU to the BDR router? Since they have a full adjacency with it.
Thank you in advance.