3.11 Configure, verify, and troubleshoot EIGRP for IPv4 (excluding authentication, filtering, manual summarization, redistribution, stub)

Screenshot_2018-04-08_17-17-37.png

For the above topology the configuration is rather simple. In order for the routers to form neighbor relationships they must have the same EIGRP process id:

R1 config:

interface FastEthernet0/0
 ip address 10.1.1.1 255.255.255.0
 duplex half
!
interface GigabitEthernet4/0
 ip address 10.0.0.1 255.255.255.0
 negotiation auto
!
router eigrp 1
 network 10.0.0.0 0.0.0.255
 network 10.1.1.0 0.0.0.255
 auto-summary
!

R2 config:

interface GigabitEthernet4/0
 ip address 10.0.0.2 255.255.255.0
 negotiation auto
!
interface GigabitEthernet5/0
 ip address 10.2.2.2 255.255.255.0
 negotiation auto
!
interface GigabitEthernet6/0
 no ip address
 shutdown
 negotiation auto
!
router eigrp 1
 network 10.0.0.0 0.0.0.255
 network 10.2.2.0 0.0.0.255
 auto-summary
!

R3 config:

interface FastEthernet0/0
 ip address 10.1.1.3 255.255.255.0
 duplex half
!
interface GigabitEthernet4/0
 ip address 10.2.2.3 255.255.255.0
 negotiation auto
!
router eigrp 1
 network 10.1.1.0 0.0.0.255
 network 10.2.2.0 0.0.0.255
 auto-summary
!

Troubleshooting EIGRP is rather simple use the following commands:

R1#show ip eigrp neighbors 
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
 (sec) (ms) Cnt Num
1 10.1.1.3 Fa0/0 12 00:00:34 37 222 0 10
0 10.0.0.2 Gi4/0 14 00:04:59 15 300 0 8
R1#show ip eigrp ? 
 <1-65535> Autonomous System
 accounting IP-EIGRP Accounting
 interfaces IP-EIGRP interfaces
 neighbors IP-EIGRP neighbors
 topology IP-EIGRP Topology Table
 traffic IP-EIGRP Traffic Statistics
 vrf Select a VPN Routing/Forwarding instance

R1#show ip eigrp interfaces 
IP-EIGRP interfaces for process 1
 Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Gi4/0 1 0/0 15 0/1 50 0
Fa0/0 1 0/0 37 0/1 50 0
R1#show ip eigrp topology 
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
 r - reply Status, s - sia Status

P 10.2.2.0/24, 1 successors, FD is 3072
 via 10.0.0.2 (3072/2816), GigabitEthernet4/0
 via 10.1.1.3 (28416/2816), FastEthernet0/0
P 10.1.1.0/24, 1 successors, FD is 28160
 via Connected, FastEthernet0/0
P 10.0.0.0/24, 1 successors, FD is 2816
 via Connected, GigabitEthernet4/0
R1#show ip route 
Codes: 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

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 3 subnets
D 10.2.2.0 [90/3072] via 10.0.0.2, 00:00:41, GigabitEthernet4/0
C 10.1.1.0 is directly connected, FastEthernet0/0
C 10.0.0.0 is directly connected, GigabitEthernet4/0

Missing routes in the routing table may indicate a failed relationship or missing “network” commands in the EIGRP configuration.

The debug commands are helpful for troubleshooting neighbor relationships:

 
R3#debug ip eigrp                    
IP-EIGRP Route Events debugging is on
R3#debug ip eigrp nei
R3#debug ip eigrp neighbor 1 10.1.1.1
IP Neighbor target enabled on AS 1 for 10.1.1.1
IP-EIGRP Neighbor Target Events debugging is on

R3#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R3(config)#int g4/0
R3(config-if)#shutdown
*Apr  8 17:42:34.219: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.2.2.2 (GigabitEthernet4/0) is down: interface down
*Apr  8 17:42:34.223: IP-EIGRP(Default-IP-Routing-Table:1): route installed for 10.0.0.0  ()
*Apr  8 17:42:34.247: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.2.0/24 - not in IP routing table
*Apr  8 17:42:34.247: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.2.2.0/24 metric 4294967295 - 0 4294967295
*Apr  8 17:42:34.283: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming REPLY packet
*Apr  8 17:42:34.283: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.2.2.0/24 M 28672 - 25600 3072 SM 3072 - 2560 512
*Apr  8 17:42:34.287: IP-EIGRP(Default-IP-Routing-Table:1): route installed for 10.2.2.0  ()
R3(config-if)#no shutdown
*Apr  8 17:42:36.163: %LINK-5-CHANGED: Interface GigabitEthernet4/0, changed state to administratively down
*Apr  8 17:42:36.327: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.2.0/24 - do advertise out FastEthernet0/0
*Apr  8 17:42:36.327: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.2.2.0/24 metric 4294967295 - 25600 4294967295
*Apr  8 17:42:36.387: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming REPLY packet
*Apr  8 17:42:36.387: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.2.2.0/24 M 28672 - 25600 3072 SM 3072 - 2560 512
*Apr  8 17:42:36.387: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.2.0/24 routing table not updated thru 10.1.1.1
*Apr  8 17:42:36.403: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.2.0/24 - do advertise out FastEthernet0/0
*Apr  8 17:42:36.403: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.2.2.0/24 metric 2816 - 2560 256
*Apr  8 17:42:37.159: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.2.2.2 (GigabitEthernet4/0) is up: new adjacency
*Apr  8 17:42:37.179: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.1.0/24 - do advertise out GigabitEthernet4/0
*Apr  8 17:42:37.179: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.1.0/24 metric 28160 - 25600 2560
*Apr  8 17:42:37.183: IP-EIGRP(Default-IP-Routing-Table:1): 10.0.0.0/24 - do advertise out GigabitEthernet4/0
*Apr  8 17:42:37.183: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.0.0.0/24 metric 28416 - 25600 2816
*Apr  8 17:42:37.183: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.2.0/24 - do advertise out GigabitEthernet4/0
*Apr  8 17:42:38.267: %LINK-3-UPDOWN: Interface GigabitEthernet4/0, changed state to up
*Apr  8 17:42:42.011: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet
*Apr  8 17:42:42.215: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet
*Apr  8 17:42:42.215: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.0.0.0/24 M 3072 - 2560 512 SM 2816 - 2560 256
*Apr  8 17:42:42.219: IP-EIGRP(Default-IP-Routing-Table:1): route installed for 10.0.0.0  ()
*Apr  8 17:42:42.219: IP-EIGRP(Default-IP-Routing-Table:1): route installed for 10.0.0.0  ()
*Apr  8 17:42:42.219: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.1.0/24 M 28672 - 25600 3072 SM 28416 - 25600 2816
*Apr  8 17:42:42.219: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.1.0/24 routing table not updated thru 10.2.2.2
*Apr  8 17:42:42.219: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.1.0/24 - do advertise out GigabitEthernet4/0
*Apr  8 17:42:42.219: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.1.0/24 metric 28160 - 25600 2560
*Apr  8 17:42:42.219: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.2.0/24 - do advertise out GigabitEthernet4/0
*Apr  8 17:42:42.227: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet
*Apr  8 17:42:42.227: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.0.0.0/24 M 3072 - 2560 512 SM 2816 - 2560 256
*Apr  8 17:42:42.227: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.1.0/24 M 28672 - 25600 3072 SM 28416 - 25600 2816
*Apr  8 17:42:42.231: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.0.0.0/24 metric 3072 - 2560 512
*Apr  8 17:42:42.235: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet
*Apr  8 17:42:42.235: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.1.0/24 M 4294967295 - 25600 4294967295 SM 4294967295 - 25600 4294967295
*Apr  8 17:42:42.235: IP-EIGRP(Default-IP-Routing-Table:1): 10.0.0.0/24 - do advertise out FastEthernet0/0
*Apr  8 17:42:42.239: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.0.0.0/24 metric 3072 - 2560 512
*Apr  8 17:42:42.247: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.1.0/24 #- do advertise out GigabitEthernet4/0
*Apr  8 17:42:42.247: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.1.0/24 metric 28160 - 25600 2560
*Apr  8 17:42:42.247: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.2.0/24 - do advertise out GigabitEthernet4/0

 

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