Step 2: Configure eigrp.

1. Enable EIGRP AS 100 for all interfaces on R1 and R2. For your reference, these are the commands which can be used:

R1(config)# router eigrp 100

R1(config-router)# network 10.0.0.0

R2(config)# router eigrp 100

R2(config-router)# network 10.0.0.0

R2(config-router)# network 192.168.0.0 0.0.255.255

2. Summarize R2’s loopback interfaces in its EIGRP update to R1 using manual summarization.

R2(config)# interface serial 0/0/0

R2(config-if)# ip summary-address eigrp 100 192.168.0.0 255.255.248.0

3. Configure a static route on R2 to R3’s LAN. Configure a default static route on R3 forwarding all traffic to R2.

R2(config)# ip route 10.1.5.0 255.255.255.0 10.4.4.2

R3(config)# ip route 0.0.0.0 0.0.0.0 10.4.4.1

4. Verify that R2 and R3 can ping the other’s LAN intefaces.

R2# ping 10.1.5.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.5.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/28/28 ms

R2#

R3# ping 10.3.3.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.3.3.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/28/28 ms

R3#

5. Verify the EIGRP the neighbor relationship between R1 and R2 with the show ip eigrp neighbors command. Verify that R1 is receiving a summary route for R2’s loopback networks. The output for R2 is as follows.

R2# show ip eigrp neighbors

EIGRP-IPv4 Neighbors for AS(100)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 10.2.2.1 Se0/0/0 12 00:51:26 363 2178 0 9

R2#

6. Examine R1’s routing table with the show ip route eigrp command.

R1# show ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

a - application route

+ - replicated route, % - next hop override

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 6 subnets, 3 masks

C 10.1.1.0/24 is directly connected, GigabitEthernet0/0

L 10.1.1.1/32 is directly connected, GigabitEthernet0/0

C 10.2.2.0/30 is directly connected, Serial0/0/0

L 10.2.2.1/32 is directly connected, Serial0/0/0

D 10.3.3.0/30 [90/2172416] via 10.2.2.2, 00:52:58, Serial0/0/0

D 10.4.4.0/30 [90/2681856] via 10.2.2.2, 00:52:58, Serial0/0/0

D 192.168.0.0/21 [90/2297856] via 10.2.2.2, 00:47:02, Serial0/0/0

R1#

Does R1 have a route to R3’s LAN? Why or why not.

No. R3 is not implementing EIGRP and R1 does not have a route to the 10.1.5.0/24 network.