STEP 20 — Configure OSPF (Single Area FIRST)

We start simple: Area 0 everywhere
(CCNP multi-area comes later)

---

🔹 STEP 20.1 — OSPF on HO-R1

enable
configure terminal
router ospf 1
network 10.10.10.0 0.0.0.255 area 0
network 10.255.255.0 0.0.0.3 area 0
end
write memory

---

🔹 STEP 20.2 — OSPF on BR-R2

enable
configure terminal
router ospf 1
network 10.20.10.0 0.0.0.255 area 0
network 10.255.255.0 0.0.0.3 area 0
end
write memory