R1#
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Loopback1
ip address 100.100.100.1 255.255.255.255
!
interface Loopback2
ip address 200.200.200.1 255.255.255.255
!
interface Loopback3
ip address 30.30.30.1 255.255.255.255
!
interface Serial0/0
ip address 12.12.12.1 255.255.255.0
!
router eigrp 10
network 1.1.1.1 0.0.0.0
network 12.12.12.1 0.0.0.0
no auto-summary
!
router ospf 1
log-adjacency-changes
network 30.30.30.1 0.0.0.0 area 0
!
router rip
version 2
network 200.200.200.0
R2#
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 23.23.23.2 255.255.255.0
!
interface Serial0/0
ip address 12.12.12.2 255.255.255.0
!
router eigrp 10
network 2.2.2.2 0.0.0.0
network 12.12.12.2 0.0.0.0
network 23.23.23.2 0.0.0.0
no auto-summary
R3#
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Loopback1
ip address 10.0.0.1 255.255.255.255
!
interface Loopback2
ip address 10.0.0.2 255.255.255.255
!
interface Loopback3
ip address 10.0.0.3 255.255.255.255
!
interface Loopback4
ip address 10.0.0.4 255.255.255.255
!
interface Loopback5
ip address 10.0.0.5 255.255.255.255
!
interface Loopback6
ip address 10.0.0.6 255.255.255.255
!
interface Loopback7
ip address 10.0.0.7 255.255.255.255
!
interface FastEthernet0/0
ip address 23.23.23.3 255.255.255.0
!
router eigrp 10
network 3.3.3.3 0.0.0.0
network 10.0.0.1 0.0.0.0
network 10.0.0.2 0.0.0.0
network 10.0.0.3 0.0.0.0
network 10.0.0.4 0.0.0.0
network 10.0.0.5 0.0.0.0
network 10.0.0.6 0.0.0.0
network 10.0.0.7 0.0.0.0
network 23.23.23.3 0.0.0.0
no auto-summary
In EIGRP, authentication only using MD5
R1(config-router)#key chain EIGRP
R1(config-keychain)# key 1
R1(config-keychain-key)# key-string CISCO
R1(config)#int s0/0
R1(config)#ip authenti key-ch eigrp 10 EIGRP
R1(config-if)#ip authen mode eigrp 10 md5
R2(config-router)#key chain EIGRP
R2(config-keychain)# key 1
R2(config-keychain-key)# key-string CISCO
R2(config)#int s0/0
R2(config)#ip authenti key-ch eigrp 10 EIGRP
R2(config-if)#ip authen mode eigrp 10 md5
Check debug EIGRP packet to see authentication
R1(config-if)#do de eigrp packe
EIGRP Packets debugging is on
(UPDATE, REQUEST, QUERY, REPLY, HELLO, IPXSAP, PROBE, ACK, STUB, SIAQUERY, SIAREPLY)
*Mar 1 00:50:10.691: EIGRP: received packet with MD5 authentication, key id = 1
*Mar 1 00:50:10.695: EIGRP: Received HELLO on Serial0/0 nbr 12.12.12.2
*Mar 1 00:50:10.695: AS 10, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
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