Lab Simulation 63 Please use the "Tasks" and "Topology" tabs to complete this lablet. Topology Tasks Configure OSPF routing for the network by completing the following tasks. Task 1 - Configure OSPF o

Submitted by femi9· Mar 5, 2026IP Connectivity - Configure and verify single-area OSPFv2, including router ID, DR/BDR election, and neighbor adjacencies (Cisco CCNA Exam Domain 3.0)

Question

Lab Simulation 63 Please use the "Tasks" and "Topology" tabs to complete this lablet. Topology Tasks Configure OSPF routing for the network by completing the following tasks. Task 1

Configure OSPF on R1:
use process ID 30
use E0/0 IP as the router ID

Task 2

Establish neighbor adjacencies with R2 and R3 by enabling OSPF directly on the relevant

interfaces.

Ensure R1 always become the DR.

Answer:

Task 1: Basic OSPF Configuration

Process ID 30
Router-ID = E0/0 IP address (10.0.12.1)

R1# conf t interface e0/0 ip ospf 30 area 0 interface e0/1 ip ospf 30 area 0 router ospf 30 router-id 10.0.12.1 OSPF uses the manually set router-ID (10.0.12.1 from E0/0). Enabling OSPF on E0/0 and E0/1 allows R1 to form adjacencies with R2 and R3. Task 2: Interface Configuration and DR Priority To make R1 always the DR, set its OSPF interface priority highest (e.g., 255) on both links. interface e0/0 ip ospf priority 255 interface e0/1 ip ospf priority 255 On R2 and R3, interfaces connected to R1 must be placed into OSPF area 0 with lower priority, typically default (1) or set to 0 if needed. R2# conf t interface e0/0 ip ospf 30 area 0 ip ospf priority 1 ! default is fine interface e0/1 ip ospf 30 area 0 R3# conf t interface e0/0 ip ospf 30 area 0 interface e0/1 ip ospf 30 area 0 OSPF elects the DR based on interface priority. With R1 set to 255, it always wins the DR election on all multiaccess segments in Area 0.

Explanation

The correct solution configures OSPF process ID 30 on R1 with a manually defined router-ID matching the E0/0 IP address (10.0.12.1), ensuring a stable and predictable router identity. OSPF is enabled directly on interfaces E0/0 and E0/1 using the 'ip ospf 30 area 0' interface-level command, which is the modern preferred method over the legacy 'network' statement approach. Setting the OSPF interface priority to 255 on both R1 interfaces guarantees R1 wins the DR election on all connected segments, since the router with the highest priority always becomes the DR (a priority of 0 makes a router ineligible).

Topics

#OSPF Configuration#DR/BDR Election#Router ID#Interface-level OSPF

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