1. The document provides instructions for configuring OSPF routing, filtering LSAs, and summarizing routes between OSPF areas on a network with multiple routers. 2. Tasks include configuring OSPF on each router, filtering routes between areas, redistributing EIGRP routes into OSPF, and using prefix lists and route summarization. 3. The solution shows the OSPF and redistribution configurations needed on each router to implement the requested tasks and filters.

1. Lab 21: OSPF Filtering & Summarization
Task
1. Configure IP Address as per given in topology.
2. Configure OSPF According to the topology and provide Router-ID as Router Name (like 1.1.1.1 for
R1).
3. Communicate OSPF Area 100 to OSPF Area 0.
4. Make sure R1 not received R12 loopback. Do possible Configuration.
5. Make sure OSPF Area 40 using Totally Stub for LSA Filtering.
6. Make sure R12 not received R10 loopback. Use prefix list for this task.
7. Area 10 not received R7 loopback. Use filter list to complete this task.
8. Make sure R1 Redistribute EIGRP as External type 1.
9. OSPF Area 100 send R12 loopback using manual summarization.
10. Make sure R1 loopback 3 is not advertise in OSPF domain.
Figure 1 Topology

2. Lab 21: OSPF Filtering & Summarization
Solution
 Task 2: Configure OSPF According to the topology and provide Router-ID as Router Name (like
1.1.1.1 for R1).
R1
router ospf 1
router-id 1.1.1.1
network 24.45.99.0 0.0.0.255 area 0
network 25.0.0.0 0.0.0.255 area 0
network 158.52.64.0 0.0.0.255 area 0
R2
router ospf 1
router-id 2.2.2.2
network 15.24.0.0 0.0.0.255 area 10
network 25.0.0.0 0.0.0.255 area 0
network 84.122.34.0 0.0.0.255 area 0
network 99.54.66.0 0.0.0.255 area 0
network 199.50.200.0 0.0.0.255 area 10
R3
router ospf 1
network 25.0.0.0 0.0.0.255 area 0
network 74.175.65.0 0.0.0.255 area 40
network 84.122.34.0 0.0.0.255 area 0
network 158.52.64.0 0.0.0.255 area 0
R4
router ospf 1
router-id 4.4.4.4
network 24.45.99.0 0.0.0.255 area 0
network 25.0.0.0 0.0.0.255 area 0
network 99.54.66.0 0.0.0.255 area 0
network 100.0.0.0 0.0.0.255 area 87

3. Lab 21: OSPF Filtering & Summarization
R5
router ospf 1
router-id 5.5.5.5
network 145.33.54.0 0.0.0.255 area 10
network 199.50.200.0 0.0.0.255 area 10
R6
router ospf 1
router-id 6.6.6.6
network 15.24.0.0 0.0.0.255 area 10
network 33.42.21.0 0.0.0.255 area 10
R7
router ospf 1
router-id 7.7.7.7
network 7.7.1.1 0.0.0.0 area 40
network 7.7.2.1 0.0.0.0 area 40
network 7.7.3.1 0.0.0.0 area 40
network 7.7.4.1 0.0.0.0 area 40
network 74.175.65.0 0.0.0.255 area 40
R8
router ospf 1
router-id 8.8.8.8
area 100 range 12.12.0.0 255.255.248.0
network 100.0.0.0 0.0.0.255 area 87
network 201.114.25.0 0.0.0.255 area 100
R9
router ospf 1
router-id 9.9.9.9
network 9.9.1.1 0.0.0.0 area 10
network 9.9.2.1 0.0.0.0 area 10
network 9.9.3.1 0.0.0.0 area 10
network 9.9.4.1 0.0.0.0 area 10
network 145.33.54.0 0.0.0.255 area 10

4. Lab 21: OSPF Filtering & Summarization
R10
router ospf 1
router-id 10.10.10.10
network 10.10.1.0 0.0.0.255 area 10
network 10.10.2.0 0.0.0.255 area 10
network 10.10.3.0 0.0.0.255 area 10
network 10.10.4.0 0.0.0.255 area 10
network 33.42.21.0 0.0.0.255 area 10
R11
router ospf 1
router-id 11.11.11.11
network 11.11.11.1 0.0.0.0 area 40
network 11.11.12.1 0.0.0.0 area 40
network 11.11.13.1 0.0.0.0 area 40
network 11.11.14.1 0.0.0.0 area 40
network 74.175.65.0 0.0.0.255 area 40
R12
router ospf 1
router-id 12.12.12.12
network 12.12.1.1 0.0.0.0 area 100
network 12.12.2.1 0.0.0.0 area 100
network 12.12.3.1 0.0.0.0 area 100
network 12.12.4.1 0.0.0.0 area 100
network 201.114.25.0 0.0.0.255 area 100
 Task 3: Communicate OSPF Area 100 to OSPF Area 0.
R4
router ospf 1
area 87 virtual-link 8.8.8.8
R8
router ospf 1
area 87 virtual-link 4.4.4.4

5. Lab 21: OSPF Filtering & Summarization
 Task 4: Make sure R1 not received R12 loopback. Do possible Configuration.
R1
access-list 10 deny 12.12.1.0 0.0.0.255
access-list 10 deny 12.12.2.0 0.0.0.255
access-list 10 deny 12.12.3.0 0.0.0.255
access-list 10 deny 12.12.4.0 0.0.0.255
access-list 10 permit any
router ospf 1
distribute-list 10 in FastEthernet0/0
exit
 Task 5: Make sure OSPF Area 40 using Totally Stub for LSA Filtering.
R3
router ospf 1
area 40 stub no-summary
exit
R7
router ospf 1
area 40 stub
exit
R11
router ospf 1
area 40 stub
exit
 Task 6: Make sure R12 not received R10 loopback. Use prefix list for this task.
R12
ip prefix-list R10loop seq 5 deny 10.10.0.0/16 ge 24 le 24
ip prefix-list R10loop seq 10 permit 0.0.0.0/0 le 32
router ospf 1
distribute-list prefix R10loop in FastEthernet0/0
exit

6. Lab 21: OSPF Filtering & Summarization
 Task 7: Area 10 not received R7 loopback. Use filter list to complete this task.
R2
ip prefix-list R7loop seq 5 deny 7.7.0.0/16 ge 24 le 24
ip prefix-list R7loop seq 10 permit 0.0.0.0/0 le 32
router ospf 1
area 10 filter-list prefix R7loop in
exit
 Task 8: Make sure R1 Redistribute Eigrp as External type 1.
R1
router ospf 1
redistribute eigrp 100 metric 1 metric-type 1 subnets
exit
 Task 9: OSPF Area 100 send R12 loopback using manual summarization.
R8
router ospf 1
area 100 range 12.12.0.0 255.255.248.0
exit
 Task 10: Make sure R1 loopback 3 is not advertise in ospf domain.
R1
router ospf 1
summary-address 100.100.3.0 255.255.255.0 not-advertise
exit