Hi ,
I need an help to configure network correcly, I divided my ospf network to areas and now I cant summarize the ip blocks with ospf area ranges. I divided one area to 4 different area due to too much router were at one area, these four diffirent area using the ranges 172.17.41.0/24 and 172.17.42.0/24 mixed. how can I summarize them on router B and decrease route table on backbone routers. I try to show with simple diagram at below, Thanks everyone to all helps.