Lab 6: Deploy a Single-Area OSPF Network

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Lesson format7 sections1 code block1 practice itemUpdated Oct 2, 2026

bash

R1(config)# router ospf 1
R1(config-router)# router-id 10.255.255.1
R1(config-router)# auto-cost reference-bandwidth 10000
R1(config-router)# passive-interface default
R1(config-router)# no passive-interface gi0/0
R1(config-router)# no passive-interface gi0/1
R1(config-router)# exit

R1(config)# interface gi0/0
R1(config-if)# ip ospf 1 area 0
R1(config-if)# exit
R1(config)# interface gi0/1
R1(config-if)# ip ospf 1 area 0
R1(config-if)# exit

Lab 6 replaces the static routes from Lab 5 with OSPF. Remove all the static routes, then configure OSPF on all three routers. The topology rediscovers itself dynamically. Verify by shutting an interface — OSPF reconverges automatically. That's the value dynamic routing delivers.

#Configuration Steps#link

Remove all static routes with `no ip route ...` on all routers
Configure loopback interfaces on each router for stable Router IDs
Set explicit Router IDs matching the loopback addresses
Set reference bandwidth to 10000 (10 Gbps) on all routers — must match
Enable OSPF on transit interfaces with `ip ospf 1 area 0`
Make user-facing interfaces passive — no OSPF neighbors should form there
Verify: `show ip ospf neighbor` should show FULL
Verify: `show ip route ospf` should show remote LANs

Remove static routes. Configure OSPF with Router IDs, reference bandwidth, and passive interfaces on user-facing ports. Verify adjacencies with `show ip ospf neighbor`. Verify routes with `show ip route ospf`. Test by disconnecting a transit link — OSPF should reconverge and traffic should flow over the remaining path within 30 seconds.

★ 20 XPmedium

challenge BLOCK (★ 20 XP)

You notice R1 and R3 both show metrics of 2 to reach each other's LANs, but R3's routes to R2's loopback show metric 3. What does this mean?

Select your proof vectors above

callout

OSPF replaces static routing with dynamic. Adjacencies form, routes propagate, and topology changes converge automatically. Next lab adds DHCP, NAT, and NTP services.

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{
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Laboratory sanity code

Isolate active probes on matched virtual networks and keep execution streams sandboxed.

R1(config)# router ospf 1

R1(config-router)# router-id 10.255.255.1

R1(config-router)# auto-cost reference-bandwidth 10000

R1(config-router)# passive-interface default

R1(config-router)# no passive-interface gi0/0

R1(config-router)# no passive-interface gi0/1

R1(config-router)# exit

R1(config)# interface gi0/0

R1(config-if)# ip ospf 1 area 0

R1(config-if)# exit

R1(config)# interface gi0/1

R1(config-if)# ip ospf 1 area 0

R1(config-if)# exit