2.7.1 Packet Tracer – Single-Area OSPFv2 Configuration Answers

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Packet Tracer – Single-Area OSPFv2 Configuration (Answers Version)

Answers Note: Red font color or gray highlights indicate text that appears in the instructor copy only.

Addressing Table

Objectives

Implement single-area OSPFv2 in both point-to-point and broadcast multiaccess networks.

Background

You are helping a network engineer test an OSPF set up by building the network in the lab where you work. You have interconnected the devices and configured the interfaces and have connectivity within the local LANs. Your job is to complete the OSPF configuration according to the requirements left by the engineer.

Use the information provided and the list of requirements to configure the test network. When the task has been successfully completed, all hosts should be able to ping the internet server.

Instructions

Configure the network to meet the requirements.

Requirements

Use process ID 10 for OSPF activation on all routers.

• Activate OSPF using network statements and inverse masks on the routers in the Headquarters network.
• Activate OSPF by configuring the interfaces of the network devices in the Data Service network, where required.
• Configure router IDs on the multiaccess network routers as follows:

o         BC-1: 6.6.6.6

o         BC-2: 5.5.5.5

o         BC-3: 4.4.4.4

• Configure OSPF so that routing updates are not sent into networks where they are not required.
• Configure router BC-1 with the highest OSPF interface priority so that it will always be the designated router of the multiaccess network.
• Configure a default route to the ISP cloud using the exit interface command argument.
• Automatically distribute the default route to all routers in the network.
• Configure the OSPF routers so that the Gigabit Ethernet interface cost will be 10 and the Fast Ethernet cost will be 100.
• Configure the OSPF cost value of P2P-1 interface Serial0/1/1 to 50.
• Configure the hello and dead timer values on the interfaces that connect P2P-1 and BC-1 to be twice the default values.

End of document

Answer Configurations

P2P-1

enable

configure terminal

interface Serial0/1/1

 ip ospf cost 50

interface Serial0/2/0

 ip ospf hello-interval 20

 ip ospf dead-interval 80

router ospf 10

auto-cost reference-bandwidth 1000

 network 10.0.0.0 0.0.0.3 area 0

 network 10.0.0.8 0.0.0.3 area 0

 network 10.0.0.12 0.0.0.3 area 0

end

P2P-2

enable

configure terminal

router ospf 10

 log-adjacency-changes

 passive-interface GigabitEthernet0/0/0

 passive-interface GigabitEthernet0/0/1

 auto-cost reference-bandwidth 1000

 network 10.0.0.0 0.0.0.3 area 0

 network 10.0.0.4 0.0.0.3 area 0

 network 192.168.1.0 0.0.0.255 area 0

 network 192.168.2.0 0.0.0.255 area 0

end

P2P-3

enable

configure terminal

!

router ospf 10

 log-adjacency-changes

 passive-interface GigabitEthernet0/0/0

 auto-cost reference-bandwidth 1000

 network 10.0.0.4 0.0.0.3 area 0

 network 10.0.0.8 0.0.0.3 area 0

 network 192.168.3.0 0.0.0.15 area 0

end

BC-1

enable

configure terminal

interface GigabitEthernet0/0/0

 ip ospf priority 255

 ip ospf 10 area 0

interface Serial0/1/0

 ip ospf hello-interval 20

 ip ospf dead-interval 80

 ip ospf 10 area 0

router ospf 10

 router-id 6.6.6.6

 passive-interface Serial0/1/1

 auto-cost reference-bandwidth 1000

 default-information originate

ip route 0.0.0.0 0.0.0.0 Serial0/1/1

end

BC-2

enable

configure terminal

interface GigabitEthernet0/0/0

ip ospf 10 area 0

interface GigabitEthernet0/0/1

ip ospf 10 area 0

router ospf 10

 router-id 5.5.5.5

 passive-interface GigabitEthernet0/0/0

 auto-cost reference-bandwidth 1000

end

BC-3

enable

configure terminal

interface GigabitEthernet0/0/0

ip ospf 10 area 0

interface GigabitEthernet0/0/1

ip ospf 10 area 0

router ospf 10

 router-id 4.4.4.4

 passive-interface GigabitEthernet0/0/0

 auto-cost reference-bandwidth 1000

end

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