一、目的
1．完成路由器基本参数配置；
2．在cisco1上创建4个环回口;在cisco3上创建1个环回口；
3．所有路由器参与EIGRP，AS号为100。
二、拓扑
三、步骤
1.启动EIGRP进程
cisco1(config)#router eigrp 100
cisco1(config-router)#network 192.168.12.0
cisco1(config-router)#network 172.16.0.0
cisco1(config-router)#network 172.16.1.0
cisco1(config-router)#network 172.16.2.0
cisco1(config-router)#network 172.16.3.0
cisco2(config)#router eigrp 100
cisco2(config-router)#network 192.168.12.0
cisco2(config-router)#network 192.168.23.0
cisco3(config)#router eigrp 100
cisco3(config-router)#network 192.168.23.0
cisco3(config-router)#network 10.0.0.0
2.查看cisco2的路由表
cisco2#show ip route
Gateway of last resort is not set
D 172.16.0.0/16 [90/2297856] via 192.168.12.1, 00:01:11, Serial0
D 10.0.0.0/8 [90/2297856] via 192.168.23.3, 00:01:11, Serial1
C 192.168.12.0/24 is directly connected, Serial0
C 192.168.23.0/24 is directly connected, Serial1
【EIGRP的代号为D，来源与它的核心算法：DUAL 。EIGRP的自治系统内部管理距离值为90。度量值的计算参数为：带宽，延迟，可靠，负载，MTU。但是默认情况下只有带宽和延迟】
3．查看cisco2上运行的动态路由选择协议
cisco2#show ip protocols
Routing Protocol is "eigrp 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
【 计算EIGRP度量值默认的参数是：K1(带宽)，K3（延迟）】
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 100
Automatic network summarization is in effect
Automatic address summarization:
192.168.23.0/24 for Serial0
192.168.12.0/24 for Serial1
Maximum path: 4
Routing for Networks:
192.168.12.0
192.168.23.0
Routing Information Sources:
Gateway Distance Last Update
192.168.12.1 90 00:03:53
192.168.23.3 90 00:03:53
Distance: internal 90 external 170
注： 在cisco2上宣告的两个网段
4．查看EIGRP的邻居表
cisco2#show ip eigrp neighbors
IP-EIGRP neighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 192.168.23.3 Se1 12 00:23:42 24 200 0 4
0 192.168.12.1 Se0 11 00:26:44 688 4128 0 3
注：H代表建立EIGRP邻居关系的先后顺序。EIGRP的HELLO时间为5秒，HOLD时间为15秒。
5．观察EIGRP的报文更新地址
cisco3#debug ip packet
IP packet debugging is on
cisco3#
01:18:51: IP: s=192.168.23.3 (local), d=224.0.0.10 (Serial1), len 60, sending broad/multicast
01:18:52: IP: s=10.0.0.1 (local), d=224.0.0.10 (Loopback0), len 60, sending broad/multicast
01:18:52: IP: s=10.0.0.1 (Loopback0), d=224.0.0.10, len 60, rcvd 2
01:18:53: IP: s=192.168.23.2 (Serial1), d=224.0.0.10, len 60, rcvd 2
【 EIGRP使用组播地址224.0.0.10来参与EIGRP进程】
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