CCNA--LAB-3：配置EIGRP路由协议
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拓补如上：
R1:
Router>en Router#conf t Router(config)#hostname R1 R1(config)#interface f0/0 R1(config-if)#ip address 192.168.1.254 255.255.255.0 R1(config-if)#no sh R1(config-if)#int f0/1 R1(config-if)#ip address 12.1.1.1 255.255.255.0 R1(config-if)#no sh R1(config-if)#exit R1(config)#router eigrp 100 --进入并启用EIGRP配置,自治系统号100（两台自治系统号需一样，不然不能建立邻居关系） R1(config-router)#no auto-summary --不要自动汇总 R1(config-router)#network 12.1.1.0 0.0.0.255 --宣告直连网段，反掩码 R1(config-router)#network 192.168.1.0 0.0.0.255 R1(config-router)#end R1#
查看路由表：
R1#show ip route Codes: C - connected, S - static, I - IGRP, 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, E - EGP i - IS-IS, 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
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0 D 192.168.2.0/24 [90/30720] via 12.1.1.2, 00:01:36, FastEthernet0/1
注：D 192.168.2.0/24 [90/30720] via 12.1.1.2, 00:01:36, FastEthernet0/1
D表示通过EIGRP学习到的， [90/30720]表示管理距离/度量值
R2:
Router>en Router#conf t Router(config)#hostname R2 R2(config)#interface f0/0 R2(config-if)#ip address 192.168.2.254 255.255.255.0 R2(config-if)#no sh R2(config-if)#int f0/1 R2(config-if)#ip address 12.1.1.2 255.255.255.0 R2(config-if)#no sh R2(config-if)#exit R2(config)#router eigrp 100 R2(config-router)#no auto-summary R2(config-router)#network 12.1.1.0 0.0.0.255 R2(config-router)#network 192.168.2.0 0.0.0.255 R2(config-router)#end R2# 查看路由表： R2#show ip route Codes: C - connected, S - static, I - IGRP, 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, E - EGP i - IS-IS, 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
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, FastEthernet0/1 D 192.168.1.0/24 [90/30720] via 12.1.1.1, 00:02:20, FastEthernet0/1 C 192.168.2.0/24 is directly connected, FastEthernet0/0 R2#
验证在PC0上拼PC1：
PC>ping 192.168.2.1
Pinging 192.168.2.1 with 32 bytes of data:
Reply from 192.168.2.1: bytes=32 time=40ms TTL=126
Reply from 192.168.2.1: bytes=32 time=33ms TTL=126 Reply from 192.168.2.1: bytes=32 time=27ms TTL=126 Reply from 192.168.2.1: bytes=32 time=23ms TTL=126
Ping statistics for 192.168.2.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 23ms, Maximum = 40ms, Average = 30ms
PC>
总结：
Eigrp 的弥散更新算法
1:记录从邻居处收到的路由。 2:100%无环路。 3:如果最好路由不可用且存在次好路由，它将会把次好路由变成最好路由。 4:如果最好路由不可用且不存在次好路由，它将会向邻居发送查询信息。 保证路由100%无环路的机理：AD
EIGRP优点：它的收敛速度极快，而且支持非等价负载均衡，支持认证。
缺点：没有区域的概念，不适于大型网络，眀是CISCO私有协议。
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