本实验主要演示show ip eigrp topoTogy、show ip eigrp traffic、debug ip eigrp和debug eigrp packet等命令的用法和输出结果。 监测清单6-2记录了实验的全过程，随后有对相应内容的讲解。
监测清单6-2 使用EIGRP常用的监测和诊断命令
R1# R1#sh ip eigrp ? interfaces IP-EIGRP mterfaces neighbors IP-BIGRP neighbors topology IP-EIGRP Topology Table traffic IP-EIGRP Traffic Statistics R1#sh ip eigrp topology IP-EIGRP Topology Table for AS(100)/ID(10.1.1.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 10..1.1.O/24, 1 sUCcessors, FD is 128256 via Connected, Loopback0 P 201.1.12.0/30, 1 successors, FD is 1792000 via Coimected, Serial0 P 201,1.13.0/30, 1 successors.FD is 1792000 via Connected, Serial 1 P 200.1.1.0/24, 2 successors, 3FT>is 1817600 via 201,1.13,2 (181760028160), Serial1 via 201.1.12.2 (1817600/281101, Serial0 R1#sh ip eigrp traffic IP-EIGRP Traffic Statistics for PRocess 100 Hellos sent/received:2469/2341 Updates :seBT/received:8/8 Queries seBt/received: 0/0 Replies seat/received: 0/0 Acks sent/received: 4/4 Input queue high water mark 2, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0 R1#conft Enter configuration commands, one per line. End with CNTL/Z. R1(config)#logg console R1(config)#^Z 01:44:12: %SYS-5-CONFIG_1: Configured from console by console R1#debug ip eigrp IP-EIGRP Route Events debugging is on R1# R1#conft Enter configuration commands, one per line. End with CNTL/Z. R1(config)#int si R1(config-if)#shut R1(config-if)#^Z R1# 01:47:45:IP-EIGRP: 201.1.13.0/30 -do advertise out Serial0 01:47:45: IP"EIGRP: Int 201,1,13.0/30 metric 4294967295-04294967295 01:47:45: IP-EIGRP: Processiag incoming REPLY packet 01:47:45: IP-EIGRP: Int 201.1,13.0/30 M 2329600-1280000 1049600 SM 1817600 - 1280000537600 01:47:45: IP-EIGRP: 201.1.13.0/30 routing table not updated 01:47:45: IP-EIGRP: Int 201.1.13.0/30 metric 2329600- 1280000 1049600 R1# 01:47:47: %LINK-5-CHANGED: Interface Seriall, changed state to administratively down R1# R1#imdebug all All possible debugging has been turned off R1#debug eigrp packet EIGRP Packets debugging is on (UPSTATE, REQUEST, QUBRY, REPLY, HELLO, IPXSAP, PROBE, ACK, STUB, SIAQUERY,SIAREPLY) R1# 01:48:17: EIGRP: Sending HELLO onLoopback0 01:48:17: AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQun/rely 0/0 01:48:17: EIGRP: Received HELLO on LoopbackO nbr 10.1.1.1 01:48:17: AS 100, Flags 0x0, Seq O/OidbQ 0/0 01:48:17: EIGRP: Packet from ourselves ignored R1# 01:48:19: Sending HELLO on Serial0 01:48:19: AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 R1# 01:48:20: EIGRP: Received HELLO on nbr 201.1.12.2 01:48:20: AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0 R1#undebug all R1# R1#sh ip route D 200.L 1.0/24[90/1817600} via 201.1.12.2, 01:02:29, Serial0 (1)show ip eigrp命令下有4个子命令，即interfaces、neighbors、topology和traffic，分别查看EIGRP协议的接口、邻居。拓扑和流量等信息。本实验中重点考察topology和traffic。两个子命令。 (2)show ip eigrp topology命令列出从EIGRP协议所获取的所有路由信息。 实验中给出了在R1路由器上使用此命令的结果，其中前3项(10.1.1.0/24、201.1.12.0/30和201.1.13.0/30)是直连接口上的网段。最后1项(200.1.1.0/24)有2个路由信息源，即R2和R3的IP地址。 show ip eigrp topology命令给出所有EIGRP路由信息，但并不是说所有这些信息都进入路由表而被路由器所使用，只有最佳的路由才被使用。最佳的路由就是度量值最小的路由。 (3)show ip eigrp traffic命令显示了EIGRP协议所产生和使用的各种信息包的发送和接收情况，其中主要有Hello、Update(更新)、Query(查询)。Reply(应答)、ACK(确认)几种包的类型。缺省情况下Hello包每5s钟发送1次，所以它的收发数最多;在一个稳定运行的网络中，其他各种包都较少。 (4)debu ip eigrp监测IP EIGRP路由事件信息。为了查看路由变化的情况，我们手工把R1路由器的S1接口关闭，查看输出的Debug信息。监测表明有关201.1.13.0/30网段的路由信息己经出现变化。 (5)debug eigrp packet命令主要监测EIGRP使用的各种信息包的收发情况，实验记录中主要是Hello包的信息。 (6)最后我们看到，关闭了S1接口后，R1路由器的路由表中只有通过201.1.12.2到达200.1.1.0/24网段这一条路由。
