I really get stuck on some OSPF issue in LAB 21. One Task is to configure the Ethernet between R1 and R2 in OSPF area 0. But how does this Area 0 connect to the other Area 0 on R5R6R7? GRE Tunnel from R2 to R5? I cannot find a solution in the final config.
Why is the Serial0/1/0 of R5 and the Serial of R6 in OSPF 0? To accomplish the taks that if the Ethernet of R5 or R6 fails we still have full connectivity? But this is done via redistribution, isnt it? I dont get it....can someone clarify that? How have you done these task?
