This lab demonstrates how to configure EIGRP on cisco routers.

Configuration Steps:

Step 1: Configure hostnames and interface IPs on all routers as follows.

**************************R1
enable
configure terminal
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
 ip address 20.20.20.2 255.255.255.254
 no shutdown
!

***************************R2
enable
configure terminal
hostname R2
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
 ip address 20.20.20.0 255.255.255.254
 no shut
!
interface FastEthernet0/1
 ip address 20.20.20.3 255.255.255.254
 no shut
!

**************************R3
enable
configure terminal
hostname R3
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
 ip address 10.10.10.2 255.255.255.254
 no shut
!
interface FastEthernet0/1
 ip address 10.10.10.0 255.255.255.254
 no shu
!

************************R4
enable
configure terminal
hostname R4
!
interface Loopback0
 ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
 ip address 10.10.10.3 255.255.255.254
 no shut
!

***********************R5
enable
configure terminal
hostname R5
!
interface Loopback0
 ip address 5.5.5.5 255.255.255.255
!
interface FastEthernet0/0
 ip address 10.10.10.1 255.255.255.254
 no shut
!

Step 2: Configure EIGRP on all the routers.

**************************R1
!
router eigrp 20
 network 1.1.1.1 0.0.0.0
 network 20.20.20.2 0.0.0.1
 auto-summary
!

*************************R2
!
router eigrp 20
 network 2.2.2.2 0.0.0.0
 network 20.20.20.0 0.0.0.1
 network 20.20.20.2 0.0.0.1
 auto-summary
!

*************************R3
!
router eigrp 20
 network 20.20.20.0 0.0.0.1
 auto-summary
!
router eigrp 10
 network 3.3.3.3 0.0.0.0
 network 10.10.10.0 0.0.0.1
 network 10.10.10.2 0.0.0.1
 auto-summary
!

*************************R4
!
router eigrp 10
 network 4.4.4.4 0.0.0.0
 network 10.10.10.2 0.0.0.1
 auto-summary
!

*************************R5
!
router eigrp 10
 network 5.5.5.5 0.0.0.0
 network 10.10.10.0 0.0.0.1
 auto-summary
!

Step 3: Verify EIGRP adjacency status

Step 4: Verify IP routing table on the routers.

By default, EIGRP routers in different AS does not exchange routes. We need to redistribute routes between the two ASes.

Step 5: Redistribute routes between AS 10 and AS 20 on R3.

*****************************R3
!
router eigrp 20
 redistribute eigrp 10
!
router eigrp 10
 redistribute eigrp 20
!

Step 6. Verify routes are exchanged between AS 10 and AS 20.

It is best practice to configure route policies to control route redistribution. Only advertise routes that meet the conditions instead of advertising all routes.

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