Step 2: Configure Routing, Summarization, and Redistribution.

In this step, we will configure EIGRP on R1 and R2, and OSPF on R2 and R3.

1. On R1, create a supernet route summarizing the loopback 48 and 49 networks and configure EIGRP in autonomous system 1.

R1(config)# interface Serial0/0/0

R1(config-if)# ip summary-address eigrp 1 192.168.48.0 255.255.254.0

R1(config-if)# exit

R1(config)# router eigrp 1

R1(config-router)# no auto-summary

R1(config-router)# network 172.16.0.0

R1(config-router)# network 192.168.0.0 0.0.255.255

R1(config-router)#

2. On R3, summarize area 20 routes and configure OSPF for area 0 and area 20.

R3(config)# router ospf 1

R3(config-router)# area 20 range 192.168.8.0 255.255.252.0

R3(config-router)# network 172.16.0.0 0.0.255.255 area 0

R3(config-router)# network 192.168.0.0 0.0.255.255 area 0

R3(config-router)# network 192.168.8.0 0.0.3.255 area 20

R3(config-router)#

3. On R2, configure EIGRP and redistribute the OSPF networks into EIGRP AS 1. Then configure OSPF and redistribute and summarize the EIGRP networks into OSPF.

R2(config)# router eigrp 1

R2(config-router)# no auto-summary

R2(config-router)# network 172.16.0.0

R2(config-router)# redistribute ospf 1 metric 10000 100 255 1 1500

R2(config-router)# exit

R2(config)#

R2(config)# router ospf 1

R2(config-router)# network 172.16.23.0 0.0.0.255 area 0

R2(config-router)# network 172.16.100.0 0.0.0.255 area 10

R2(config-router)# redistribute eigrp 1 subnets

R2(config-router)# summary-address 192.168.48.0 255.255.252.0

R2(config-router)# exit

R2(config)#

Jan 10 10:11:18.863: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.12.1 (Serial0/0/0) is up: new adjacency

R2(config)#

Jan 10 10:11:32.991: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.40.1 on Serial0/0/1 from LOADING to FULL, Loading Done

R2(config)#

4. Verify the EIGRP and OSPF routing table entries on R2.

R2# show ip route eigrp | begin Gateway

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 10 subnets, 2 masks

D 172.16.1.0/24 [90/40640000] via 172.16.12.1, 00:14:57, Serial0/0/0

D 192.168.48.0/23 [90/40640000] via 172.16.12.1, 00:14:57, Serial0/0/0

D 192.168.50.0/24 [90/40640000] via 172.16.12.1, 00:14:57, Serial0/0/0

D 192.168.51.0/24 [90/40640000] via 172.16.12.1, 00:14:57, Serial0/0/0

D 192.168.70.0/24 [90/40640000] via 172.16.12.1, 00:14:57, Serial0/0/0

R2#

R2# show ip route ospf | begin Gateway

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 10 subnets, 2 masks

O 172.16.3.0/24 [110/1563] via 172.16.23.3, 00:15:41, Serial0/0/1

O IA 192.168.8.0/22 [110/1563] via 172.16.23.3, 00:15:41, Serial0/0/1

O 192.168.20.0/24 [110/1563] via 172.16.23.3, 00:15:41, Serial0/0/1

O 192.168.25.0/24 [110/1563] via 172.16.23.3, 00:15:41, Serial0/0/1

O 192.168.30.0/24 [110/1563] via 172.16.23.3, 00:15:41, Serial0/0/1

O 192.168.35.0/24 [110/1563] via 172.16.23.3, 00:15:41, Serial0/0/1

O 192.168.40.0/24 [110/1563] via 172.16.23.3, 00:15:41, Serial0/0/1

O 192.168.48.0/22 is a summary, 00:15:30, Null0

R2#

As expected, R2 knows about the R1 routes including the summarized 192.168.48.0/22 EIGRP route. R2 also knows about the R3 OSPF area 0 routes and the summarized area 20 routes.

5. Verify the EIGRP routing table on R1.

R1# show ip route eigrp | begin Gateway

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks

D 172.16.2.0/24 [90/40640000] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 172.16.3.0/24 [170/40537600] via 172.16.12.2, 00:11:40, Serial0/0/0

D 172.16.23.0/24 [90/41024000] via 172.16.12.2, 00:11:40, Serial0/0/0

D 172.16.100.0/24 [90/40640000] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 192.168.8.0/22 [170/40537600] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 192.168.20.0/24 [170/40537600] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 192.168.25.0/24 [170/40537600] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 192.168.30.0/24 [170/40537600] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 192.168.35.0/24 [170/40537600] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 192.168.40.0/24 [170/40537600] via 172.16.12.2, 00:11:40, Serial0/0/0

D EX 192.168.48.0/22 [170/40537600] via 172.16.12.2, 00:11:38, Serial0/0/0

D 192.168.48.0/23 is a summary, 00:11:40, Null0

R1#

R1 knows about the internal EIGRP routes and the external routes redistributed from the OSPF routing domain by R2. The highlighted entry identifies the OSPF 20 routes which will be filtered using a distribute list and ACL in the next step.

6. Verify the EIGRP routing table on R3.

R3# show ip route ospf | begin Gateway

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks

O E2 172.16.1.0/24 [110/20] via 172.16.23.2, 00:22:43, Serial0/0/1

O E2 172.16.2.0/24 [110/20] via 172.16.23.2, 00:22:52, Serial0/0/1

O E2 172.16.12.0/24 [110/20] via 172.16.23.2, 00:22:52, Serial0/0/1

O IA 172.16.100.0/24 [110/1563] via 172.16.23.2, 00:22:52, Serial0/0/1

O 192.168.8.0/22 is a summary, 00:23:10, Null0

O E2 192.168.48.0/22 [110/20] via 172.16.23.2, 00:22:41, Serial0/0/1

O E2 192.168.70.0/24 [110/20] via 172.16.23.2, 00:22:42, Serial0/0/1

R3#

R3 knows about the internal OSPF routes and the external routes redistributed by R2 from the EIGRP routing domain. The highlighted entries identify the EIGRP routes which will be filtered using a distribute list and prefix list in another step.

7. Verify that you can ping across the serial links when you are finished. Use the following Tcl script to check connectivity.

R3# tclsh

foreach address {

172.16.1.1

192.168.48.1

192.168.49.1

192.168.50.1

192.168.51.1

192.168.70.1

172.16.12.1

172.16.12.2

172.16.2.1

172.16.100.1

172.16.23.2

172.16.23.3

172.16.3.1

192.168.8.1

192.168.9.1

192.168.10.1

192.168.11.1

192.168.20.1

192.168.25.1

192.168.30.1

192.168.35.1

192.168.40.1

} { ping $address }

All pings should be successful. Troubleshoot if necessary.