1：配置地址(略)，並配置EIGRP
R1(config)#routereigrp 100
R1(config-router)#noauto-summary
R1(config-router)#net192.168.12.0
R1(config-router)#net10.0.0.0
R2(config)#routereigrp 100
R2(config-router)#noauto-summary
R2(config-router)#net192.168.12.0
R2(config-router)#net192.168.23.0
R2(config-router)#net172.16.0.0
R3(config)#routereigrp 200
R3(config-router)#noauto-summary
R3(config-router)#net192.168.23.0
R3(config-router)#net192.168.0.0
R3(config-router)#net192.168.1.0
2：鄰居關係的建立條件—相同的AS號
R2#show ip eigrp neighbors
IP-EIGRPneighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.12.1 Fa0/0 13 00:01:18 154 924 0 3
以上顯示說明：配置不同AS號的EIGRP路由器不能建立鄰居關係。
R3(config)#norouter eigrp 200
R3(config)#routereigrp 100
R3(config-router)#noauto-summary
R3(config-router)#net192.168.23.0
R3(config-router)#net192.168.1.0
R3(config-router)#net192.168.0.0
R2#show ip eigrp neighbors
IP-EIGRPneighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.23.2 Se1/1 13 00:00:56 167 1002 0 6
0 192.168.12.1 Fa0/0 11 00:05:08 146 876 0 3
3：鄰居關係的建立條件—相同的K值
R3(config)#routerei 100
R3(config-router)#metricweights 0 1 1 1 1 1
R2#show ip protocols
RoutingProtocol is "eigrp 100"
Outgoing update filter list for allinterfaces is not set
Incoming update filter list for allinterfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incomingupdates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
（以下省略部分輸出）
R3(config-router)#
*Jan19 13:02:26.071: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.23.1(Serial1/0) is down: metric changed
R3(config-router)#
*Jan19 13:02:30.447: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.23.1(Serial1/0) is down: K-value mismatch
R2#
*Jan19 13:02:43.263: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.23.2(Serial1/1) is down: K-value mismatch
R2#
*Jan19 13:02:48.015: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.23.2(Serial1/1) is down: K-value mismatch
以上顯示說明：EIGRP路由器配置不同的K值，不能建立鄰居關係
R3(config)#routerei 100
R3(config-router)#metricweights 0 1 0 1 0 0
R3(config-router)#
*Jan19 13:04:09.495: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.23.1(Serial1/0) is up: new adjacency
R2#
*Jan19 13:04:09.091: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.23.2(Serial1/1) is up: new adjacency
4：鄰居關係建立的條件—鄰居接口的地址掩碼相互包含
R2(config)#interfa0/0
R2(config-if)#shutdown
R2(config-if)#ipadd 192.168.12.2 255.255.255.252
R2(config-if)#noshutdown
R2(config-if)#
*Jan19 13:07:13.099: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.1(FastEthernet0/0) is up: new adjacency
R3(config)#inters1/0
R3(config-if)#shutdown
R3(config-if)#ipadd 192.168.23.2 255.255.255.252
R3(config-if)#noshutdown
R3(config-if)#
*Jan19 13:08:32.215: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.23.1(Serial1/0) is up: new adjacency
R1(config-router)#interfa0/0
R1(config-if)#shutdown
R1(config-if)#ipadd 192.168.12.4255.255.255.0
R1(config-if)#noshutdown
R1(config-if)#
*Jan19 13:10:20.563: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is up: new adjacency
R1(config-if)#
*Jan19 13:11:40.191: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is down: retry limit exceeded
R1(config-if)#
*Jan19 13:11:43.151: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2 (FastEthernet0/0)is up: newadjacency
R2(config-if)#
*Jan19 13:10:16.131: IP-EIGRP(Default-IP-Routing-Table:100): Neighbor 192.168.12.4 not on commonsubnet for FastEthernet0/0
R2(config-if)#
*Jan19 13:10:29.763: IP-EIGRP(Default-IP-Routing-Table:100): Neighbor 192.168.12.4 not on commonsubnet for FastEthernet0/0
以上顯示說明：在EIGRP建立鄰居關係，無論是點到點網絡還是廣播網絡，只要和鄰居接口的地址掩碼相互包含即可，這一點要注意區別OSPF的現象。
R1(config-router)#interfa0/0
R1(config-if)#ipadd 192.168.12.1 255.255.255.0
R1(config-if)#
*Jan19 13:13:47.659: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is down: address changed
R1(config-if)#
*Jan19 13:13:50.131: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2 (FastEthernet0/0)is up: newadjacency
5：鄰居關係建立的條件—鄰居接口的計時器不一定要相同，但要匹配
R1(config)#interfa0/0
R1(config-if)#shutdown
R1(config-if)#iphello-interval ei 100 1
R1(config-if)#iphold-time ei 100 3
R1(config-if)#noshutdown
R1(config-if)#
*Jan19 13:22:00.447: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is up: new adjacency
以上顯示說明：在適當的計時器下，鄰居計時器不同，也能夠建立鄰居關係。
R1(config)#interfa0/0
R1(config-if)#shutdown
R1(config-if)#iphello-interval ei 100 1
R1(config-if)#iphold-time ei 100 15
R2(config)#interfa0/0
R2(config-if)#iphello-interval ei 100 5
R2(config-if)#iphold-time ei 100 3
R1(config)#interfa0/0
R1(config-if)#noshutdown
R1(config-if)#
*Jan19 13:27:29.247: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is up: new adjacency
R1(config-if)#
*Jan19 13:27:33.231: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is down: holding time expired
*Jan19 13:27:33.883: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is up: new adjacency
R1(config-if)#
*Jan19 13:27:37.235: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is down: holding time expired
R1(config-if)#
*Jan19 13:27:38.323: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.2(FastEthernet0/0) is up: new adjacency
R2(config-if)#
*Jan19 13:27:28.723: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.1(FastEthernet0/0) is up: new adjacency
R2(config-if)#
*Jan19 13:27:32.811: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.1(FastEthernet0/0) is down: Interface Goodbye received
*Jan19 13:27:33.455: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.1 (FastEthernet0/0)is up: newadjacency
R2(config-if)#
*Jan19 13:27:36.863: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.1(FastEthernet0/0) is down: Interface Goodbye received
*Jan19 13:27:37.823: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.1(FastEthernet0/0) is up: new adjacency
R2(config-if)#
*Jan19 13:27:41.979: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.12.1(FastEthernet0/0) is down: Interface Goodbye received
以上顯示說明：鄰居計時器不同，鄰居關係也可能有問題。