OSPF Frame-relay

OSPF Frame-relay detail solution guide: 1. Since you have been told to configure OSPF and restricted to do “ip ospf network” command for area 0 and area 24 but not in Area 356, you can define the command for Area 356. Configuration: Router ospf 1 Rotuer-id 1.1.1.1 Network 1.1.1.1 0.0.0.0 area 0 Network 10.12.3.1 0.0.0.0 are 0 Neighbor 10.12.3.2 (In NBMA default mode, you have to assign neighborship statically) Neighbor 10.12.3.3(In NBMA default mode, you have to assign neighborship statically) End Follow the same configuration for other routers in Area 0 , Area 24 and Area 356. In Area 356, you have slightly complex configuratin. Just follow the cofiguration as shown below: Task 3: On R2 and R3: Interface s0/0 Ip ospf priority 0 (This enforces the routers not to participate any DR/BDR election.) On R3, Interface s0/1 (Interface might be different) Ip ospf network point-to-multipoint Ip ospf hello-interval 10 On R5 & R6 Interface s0/0 Ip ospf network point-to-point Ip ospf hello-interval 10 Since the Hello interval for the multipoint network would be 30 second and 10 second for the point-to-point network , it should be matched to get neighbors up. So, you have to configure either side to match hello interval. (Its not good practice to decrease the hello interval of NBMA network, rather we can increase it on other end.) In the step 4, you are asked to make all the network reachable from R4. So, you have to know about how next-hop is treated in Frame-relay network. As soon as R2 gives the 4.4.4.4/32 network to R1, R3 learns the same prefix via R1 but next hop is unchanged. So, in this point we need to take care of “show frame-relay map” which doesn’t show 10.12.3.3 on R2’s mapping table. Therefore, you have to give the command as mentioned below: On R2: Interface s0/0 Frame-relay map ip 10.12.3.3 201 On R3: Interface s0/0 Frame-relay map ip 10.12.3.2 301 End Show frame-relay map Now, you should have two DLCI-IP mapping on each router. Finally, try the steps whether or not you are done with this lab  1. Show ip route ospf 2. Ping 6.6.6.6 source loopback0 3. Traceroute 6.6.6.6 Do the same from R4 to R5’s loopback as well: Good luck 