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

2.7.1 Packet Tracer – Single-Area OSPFv2 Configuration (Instructor Version)

Instructor 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.
[tabs]
[tab title=”P2P-1″]

P2P-1(config)#router ospf 10
P2P-1(config-router)#network 10.0.0.0 0.0.0.3 area 0
P2P-1(config-router)#network 10.0.0.8 0.0.0.3 area 0
P2P-1(config-router)#network 10.0.0.12 0.0.0.3 area 0

[/tab]
[tab title=”P2P-2″]

P2P-2(config)#router ospf 10
P2P-2(config-router)#network 10.0.0.0 0.0.0.3 area 0
P2P-2(config-router)#network 10.0.0.4 0.0.0.3 area 0
P2P-2(config-router)#network 192.168.1.0 0.0.0.255 area 0
P2P-2(config-router)#network 192.168.2.0 0.0.0.255 area 0

[/tab]
[tab title=”P2P-3″]

P2P-3(config)#router ospf 10
P2P-3(config-router)#network 10.0.0.4 0.0.0.3 area 0
P2P-3(config-router)#network 10.0.0.8 0.0.0.3 area 0
P2P-3(config-router)#network 192.168.3.0 0.0.0.15 area 0

[/tab]
[/tabs]

• Activate OSPF by configuring the interfaces of the network devices in the Data Service network, where required.
[tabs]
[tab title=”BC-1″]

BC-1(config)#interface GigabitEthernet0/0/0
BC-1(config-if)#ip ospf 10 area 0

BC-1(config-if)#interface Serial0/1/0
BC-1(config-if)#ip ospf 10 area 0

[/tab]
[tab title=”BC-2″]

BC-2(config)#interface GigabitEthernet0/0/0
BC-2(config-if)#ip ospf 10 area 0

BC-2(config-if)#interface GigabitEthernet0/0/1
BC-2(config-if)#ip ospf 10 area 0

[/tab]
[tab title=”BC-3″]

BC-3(config)#interface GigabitEthernet0/0/0
BC-3(config-if)#ip ospf 10 area 0

BC-3(config-if)#interface GigabitEthernet0/0/1
BC-3(config-if)#ip ospf 10 area 0

[/tab]
[/tabs]
• Configure router IDs on the multiaccess network routers as follows:

• BC-1: 6.6.6.6
• BC-2: 5.5.5.5
• BC-3: 4.4.4.4

[tabs]
[tab title=”BC-1″]

BC-1(config)#router ospf 10
BC-1(config-router)#router-id 6.6.6.6

[/tab]
[tab title=”BC-2″]

BC-2(config)#router ospf 10
BC-2(config-router)#router-id 5.5.5.5

[/tab]
[tab title=”BC-3″]

BC-3(config)#router ospf 10
BC-3(config-router)#router-id 4.4.4.4

[/tab]
[/tabs]
• Configure OSPF so that routing updates are not sent into networks where they are not required.
[tabs]
[tab title=”P2P-2″]

P2P-2(config)#router ospf 10
P2P-2(config-router)#passive-interface GigabitEthernet0/0/0
P2P-2(config-router)#passive-interface GigabitEthernet0/0/1

[/tab]
[tab title=”P2P-3″]

P2P-3(config)#router ospf 10
P2P-3(config-router)#passive-interface GigabitEthernet0/0/0

[/tab]
[tab title=”BC-1″]

BC-1(config)#router ospf 10
BC-1(config-router)#passive-interface Serial0/1/1

[/tab]
[tab title=”BC-2″]

BC-2(config)#router ospf 10
BC-2(config-router)#passive-interface GigabitEthernet0/0/0

[/tab]
[tab title=”BC-3″]

BC-3(config)#router ospf 10
BC-3(config-router)#passive-interface GigabitEthernet0/0/0

[/tab]
[/tabs]
• Configure router BC-1 with the highest OSPF interface priority so that it will always be the designated router of the multiaccess network.

BC-1(config)#interface GigabitEthernet0/0/0
BC-1(config-if)#ip ospf priority 255

• Configure a default route to the ISP cloud using the exit interface command argument.

BC-1(config)#ip route 0.0.0.0 0.0.0.0 Serial0/1/1

• Automatically distribute the default route to all routers in the network.

BC-1(config)#router ospf 10
BC-1(config-router)#default-information originate

• Configure the OSPF routers so that the Gigabit Ethernet interface cost will be 10 and the Fast Ethernet cost will be 100.
[tabs]
[tab title=”P2P-1″]

P2P-1(config)#router ospf 10
P2P-1(config-router)#auto-cost reference-bandwidth 1000

[/tab]
[tab title=”P2P-2″]

P2P-2(config)#router ospf 10
P2P-2(config-router)#auto-cost reference-bandwidth 1000

[/tab]
[tab title=”P2P-3″]

P2P-3(config)#router ospf 10
P2P-3(config-router)#auto-cost reference-bandwidth 1000

[/tab]
[tab title=”BC-1″]

BC-1(config)#router ospf 10
BC-1(config-router)#auto-cost reference-bandwidth 1000

[/tab]
[tab title=”BC-2″]

BC-2(config)#router ospf 10
BC-2(config-router)#auto-cost reference-bandwidth 1000

[/tab]
[tab title=”BC-3″]

BC-3(config)#router ospf 10
BC-3(config-router)#auto-cost reference-bandwidth 1000

[/tab]
[/tabs]
• Configure the OSPF cost value of P2P-1 interface Serial0/1/1 to 50.

P2P-1(config)#interface Serial0/1/1
P2P-1(config-if)#ip ospf cost 50

• Configure the hello and dead timer values on the interfaces that connect P2P-1 and BC-1 to be twice the default values.
[tabs]
[tab title=”P2P-1″]

P2P-1(config)#interface Serial0/2/0
P2P-1(config-if)#ip ospf hello-interval 20
P2P-1(config-if)#ip ospf dead-interval 80

[/tab]
[tab title=”BC-1″]

BC-1(config)#interface Serial0/1/0
BC-1(config-if)#ip ospf hello-interval 20
BC-1(config-if)#ip ospf dead-interval 80

[/tab]
[/tabs]

Answers 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

Download Packet Tracer Completed File

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