Week 5-- OSPFv2 Configurations

1) Subnet the network, given the IP = 192.168.10.0 /24

LAN 1 = 30 Hosts

/27 =255.255.255.224

27 26 = 1, 21 = 2 subnets

Block size = 256 224 = 32

192.168.10.64 /27 (.65 to .94) LAN 1

192.168.10.96 /27

192.168.10.128 /27

192.168.10.160 /27

LAN 2 = 60 Hosts

/26 = 255.255.255.192

26 24 = 2, 22 = 4 subnets

Block size = 256 192 = 64

192.168.10.0 /26 (.1 to .62) LAN 2

192.168.10.64 /26

192.168.10.128 /26

192.168.10.192 /26

LAN 3 = 20 Hosts

/28 = 255.255.255.240

28 27 =1, 21 = 2 subnets

Block size = 256 240 = 16

192.168.10.96 /28 (.97 to .110) LAN 3

192.168.10.112 /28

192.168.10.128 /28

192.168.10.144 /28

LAN 4 = 6 Hosts (OSPF Area 0 BMA network)

/29 = 255.255.255.248

29 28 =1, 21 = 2 subnets

Block size = 256 248 = 8

192.168.10.112 /29 (.113 to .118) LAN 4

192.168.10.120 /29

2) Build the following topology in Packet Tracer

Make sure the G0/0 of the routers are connected in the OSPF BMA 9Broadcast Multiple Access) LAN

3) Fill in the following chart. Assign the last IP addresses to G0/1. Assign the second IP address to the PC. Assign LAN for to the G0/0 interfaces

Interface	IP Address	Subnet Mask	Default Gateway
R1 G0/0	.113	/29	N/A
R1 G0/1	.94	/27	N/A
R2 G0/0	.114	/29	N/A
R2 G0/1	.62	/26	N/A
R3 G0/0	.115	/29	N/A
R3 G0/1	.110	/28	N/A
PC-1	.65	/27	.94
PC-2	.1	/26	.62
PC-3	.97	/28	.110

4) Configure the end devices according to the chart above

5) Configure the hostname, disable the DNS lookup and the interfaces according to the chart above

6) On R1 configure OSPF using the following:

a. Use process ID =10

b. Router-id = 1.1.1.1

c. Use wild card in the configuration

d. Block the OSPF updates (LSAs) from the LAN interface G0/1

Router ospf 10

Router-id 1.1.1.1

Network 192.168.10.64 0.0.0.31 area 0

Network 192.168.10.112 0.0.0.7 area 0

Passive-interface g0/1

7) On R2 configure OSPF using the following:

a. Use process ID =10

b. Router-id = 2.2.2.2

c. Use the G0/1 interface and quad 0s for the wild card in the configuration

d. Block the OSPF updates (LSAs) from the LAN interface G0/1

Router ospf 10

Router-id 2.2.2.2

Network 192.168.10.62 0.0.0.0 area 0

Network 192.168.10.114 0.0.0.0 area 0

Passive-interface g0/1

8) On R3 configure OSPF using the following:

a. Use process ID =10

b. Router-id = 3.3.3.3

c. Configure the OSPF to an interface

Router ospf 10

Router-id 3.3.3.3

Int g0/0

Ip ospf 10 area 0

Int g0/1

Ip ospf 10 area 0

9) Verify 3 routers ospf priorities and state. Type the command:

Sh ip ospf neighor all 3 routers priority = 1. R1= DROthers, R2 = BDR and R3 = DR.

10) Configure R1 to be the DR, and R2 to be the BDR. Make sure R3 does not participate in DR/BDR. Configure the hello-interval = 5 and dead-interval = 20

R1

Int g0/0

Ip ospf priority 255

Ip ospf hello-interval 5

Ip ospf dead-interval 20

R2

Int g0/0

Ip ospf hello-interval 5

Ip ospf dead-interval 20

R3

Int g0/0

Ip ospf priority 0

Ip ospf hello-interval 5

Ip ospf dead-interval 20

S1

reload

11) Confirm 3 routers ospf priorities and state. Type the command:

Sh ip ospf neighor all 3 routers priority = 1. R1= DR, R2 = BDR and R3 = DROthers.

12) Confirm 3 routers ospf hello and dead-interval metrics

Sh ip ospf interface g0/0 all 3 routers. Ok

13) On R2, configure a loopback 0 address = 10.10.10.10. Set the default route to loopback 0. Advertise the default route to R1 and r3

Int loopback 0

Ip add 10.10.10.10 255.255.255.255

Ip route 0.0.0.0 0.0.0.0 loopback 0

Router ospf 10

Default-information Originate

14) Verify the rouring entries in the routing table

Show ip route

15) Verify the networks that are advertised by the router

Sh ip protocols

16) Verify connectivity between the PCs