CCNA lab 9
Single-area OSPFv2
Three routers in a triangle: set router IDs, form OSPF adjacencies, make LAN ports passive and advertise a default route.
About 30 minutes 5 devices 7 tasksIntermediate
Scenario
R1, R2 and R3 are connected in a triangle and every interface is addressed and up. R2 is the internet edge: it already has a default route towards the internet (Loopback1, 203.0.113.2, stands in for it). Run OSPF process 1 in area 0 on all three routers so every network is reachable, with fixed router IDs, no OSPF hellos sent towards the PCs, and R2 advertising its default route to the others.
Your tasks
- Run OSPF process 1 on each router with router IDs 1.1.1.1 (R1), 2.2.2.2 (R2) and 3.3.3.3 (R3).
- All three router-to-router links form FULL OSPF adjacencies in area 0.
- Advertise both PC LANs, but stop OSPF hellos on R1 Gi0/2 and R3 Gi0/2.
- R2 advertises its default route into OSPF; R1 and R3 learn it.
- R1 reaches PC3's LAN directly over the R1–R3 link (lowest cost), not through R2.
- PC1 can ping PC3.
- PC1 can ping the internet address 203.0.113.2.
The lab checks the result, not the exact commands. For example, a ping task passes only when the ping really succeeds through the network you built.