Lab 6.2.4 Part A: Configuring and Verifying Point-to-Point OSPF
Step 1: Connect the equipment
- Connect the Fa0/0 interface of each router to the Fa0/1 interface of each switch using a straightthrough cable.
- Connect each host to the Fa0/2 switch port of each switch using a straight-through cable.
- Connect serial cables from each router to the other router as shown in the topology.
Step 2: Perform basic configurations on the routers
- Connect a PC to the console port of the router to perform configurations using a terminal emulation program.
- On all routers, configure the hostname, passwords, and message-of-the-day banner and disable DNS lookups according to the addressing table and topology diagram.
Step 3: Configure the router interfaces
Step 4: Verify IP addressing and interfaces
- Use the show ip interface brief or the show protocols command to verify that the IP addressing is correct and that the interfaces are active.
- After all interfaces are verified, be sure to save the running configuration to the NVRAM of the router.
Step 5: Configure Ethernet interfaces of PC1, PC2, and PC3
- Configure the Ethernet interfaces of PC1, PC2, and PC3 with the IP addresses and default gateways from the addressing table.
- Test the PC configuration by pinging the default gateway from each PC.
Step 6: Configure OSPF on Router 1
- Configure OSPF on the R1 router. Enter a process ID of 1 for the process-IDparameter. R1(config)#router ospf 1
- Configure the network statement for the LAN. When you are in the Router OSPF configuration submode, configure the LAN 172.16.1.16/28 to be included in the OSPF updates that are sent out of R1. Use an area ID of 0 for the OSPF area-id parameter. Zero will be used for the OSPF area ID in all network statements in this topology.
R1(config-router)#network 172.16.1.16 0.0.0.15 area 0
- Configure the router to advertise the 192.168.10.0/30 network attached to the Serial 0/0/0 interface.
R1(config-router)#network 192.168.10.0 0.0.0.3 area 0
- Configure the router to advertise the 192.168.10.4/30 network attached to the Serial 0/0/1 interface. R1(config-router)#network 192.168.10.4 0.0.0.3 area 0
- Return to privileged EXEC mode and save the configuration.
Step 7: Configure OSPF on the R2 router
- Enable OSPF routing on the R2 router using the router ospf command. Use a process ID of 1.
R2(config)#router ospf 1
b. Configure the router to advertise the LAN network 10.10.10.0/24 in the OSPF updates.
R2(config-router)#network 10.10.10.0 0.0.0.255 area 0
Step 8: Configure OSPF on the R3 router
Configure OSPF on the R3 router using the router ospf and network commands. Use a process ID of 1. Configure the router to advertise the three directly connected networks. When you are finished, return to privileged EXEC mode.
Step 9: Configure OSPF router IDs
- The OSPF router ID is used to uniquely identify the router in the OSPF routing domain. A router ID is an IP address. Cisco routers derive the router ID in one of three ways, and with the following precedence:
- Examine the current router IDs in the topology.
- The router ID can also be seen in the output of the show ip protocols, show ip ospf, and show ip ospf interfaces commands.
Step 10: Verify OSPF operation
- On the R1 router, use the show ip ospf neighbor command to view the information about the
- On the R1 router, use the show ip protocols command to view information about the routing protocol operation.
Step 11: Examine OSPF routes in the routing tables
View the routing table on the R1 router. OSPF routes are denoted in the routing table with an O.
Step 12: Configure OSPF cost
- Use the show ip route command on the R1 router to view the OSPF cost to reach the 10.10.10.0/24 network.
- Use the show interfaces serial0/0/0 command on the R1 router to view the bandwidth of the Serial 0/0/0 interface.
Step 13: Reflection
What are some advantages of using OSPF as a routing protocol?Jawaban : supports VLSM and CIDR, uses cost metrics to choose the best path, and each router has a complete picture of the entire network.