EIGRP 实验目的 实验原理 实验设备 可以非均衡负载平衡, 后继路由及可行后继路由, 支持 VLSM, 可以手工汇总, 以及与 IGRP 的兼容性 以上这些特点使得 EIGRP 可以使用在一些大规模的网络中, 而相对的配置比较简单

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1 EIGRP 实验目的 1 掌握 EIGRP 的基本配置及如何验证 EIGRP 的配置 ; 2 了解 EIGRP 对 VLSM 的支持, 学会如何配置 EIGRP 的手工汇总 ; 3 了解 EIGRP 与 IGRP 的自动重分布 ; 4 学会如何配置 EIGRP 的带宽利用率 ; 5 学会如何配置 EIGRP 的负载均衡 ; 6 学会如何配置 EIGRP 的基本参数 ; 实验原理 EIGRP 是 ISO 专有的路由协议, 它是 IGRP 的增强版本, 它同样使用距离向量技术, 并且作了一些有助于协议汇聚和操作效率的改进 EIGRP 有一些与链路状态协议相似的特性 它的主要特点有 : 无回路路由表, 快速汇聚, 减少带宽的使用, 使用综合度量 ( 默认情况下是带宽和延迟 ), 可以非均衡负载平衡, 后继路由及可行后继路由, 支持 VLSM, 可以手工汇总, 以及与 IGRP 的兼容性 以上这些特点使得 EIGRP 可以使用在一些大规模的网络中, 而相对的配置比较简单 EIGRP 不会使用超过一条链路声明的带宽的 50%. 在 isco 路由器上允许使用 bandwidth 命令来改变链路的默认设置 这对于串行链路通常是很有必要的, 因为默认带宽是 1.544Mb/s 如果链路的实际带宽是 56Kb/s, 就很容易发现 EIGRP 使得链路变得饱和 另外,EIGRP 还允许手工配置带宽的利用率 (bandwidth-percent), 当在网络中 bandwidth 命令不能反映链路的真实速率时, 使用该命令可以使用更多的带宽, 使得配置更加灵活 EIGRP 自动在具有相等开销的链路上负载均衡 使用 variance 命令可以在不等度量路径上实现负载均衡 EIGRP 的度量计算使用以下的公式 : metric = [( K1 bandwidth + ( K 2 bandwidth) /(256 load) + ( K3 delay)] [ K5/( reliability + K 4)] 默认值是 K1= 1, K2= 0, K3= 1, K4= 0, K5= 0. (K5,K4 为 0 时, 后一项不起作用 ) 即 metr ic = bandwidth + delay bandwidth for eigrp = ( / bandwidth) 256 另外, delay for eigrp = ( delay /10) 256 我们可以通过改变各个系数的值来改变 EIGRP 的度量计算 实验设备 带有两个串行口的路由器一台, 带有一个串行口的路由器两台 ;

2 用于配置路由器的主机三台 ; 串行线 交叉线若干 ; 实验内容 实验一 二采用如下的实验拓扑 : 图一 实验一 EIGRP 的基本配置参照图一配置好主机和路由器各个端口的 IP 地址 : Router A F0= /24 S0= /24 S1=shutdown L0= /24 L1= /24 Router B F0=shutdown S0= /24 S1= /24 Router F0= S0=shutdown S1= /24 L0= /24 L1= /24 Host A IP = /24 GW= Host B IP = /24 GW= 然后, 在每一台路由器上启用 EIGRP, 注意自治系统号要统一 可能需要用到的配置命令格式为 : Router(config)# router eigrp autonomous-system-number Router(config-router)# network network-number Router(config-if)# bandwidth kilobits Router(config-router)# eigrp log-neighbor-changes 然后, 在每一台路由器上使用 show ip route 观察路由表的情况, 用 show ip protocol 来观察是否正确的公告定义的网络 使用 show ip eigrp neighbors 来观察路由器发现的邻居 ; 使用 show ip eigrp topology 来观察 EIGRP 的拓扑表 ; 使用 show ip eigrp interfaces [interface-type interface-number] [as-number] 显示 EIGRP 的端口信息, 使用 show ip eigrp neighbors [interface-type as-number static] 显示 EIGRP 发现的邻居的信息 各个路由器的配置以及输出信息如下 :

3 Router A: show running-config show ip route show ip protocols show ip eigrp neighbors show ip eigrp interfaces show ip eigrp topology Router B: show running-config show ip route show ip protocols show ip eigrp neighbors show ip eigrp interfaces show ip eigrp topology Router : show running-config show ip route show ip protocols show ip eigrp neighbors show ip eigrp interfaces show ip eigrp topology RouterA#sh run Building configuration... urrent configuration: version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption hostname RouterA ip subnet-zero interface Loopback0 ip address no ip directed-broadcast interface Loopback1 ip address no ip directed-broadcast interface Ethernet0 ip address no ip directed-broadcast interface Serial0 bandwidth 64 ip address no ip directed-broadcast no fair-queue

4 router eigrp 75 network network eigrp log-neighbor-changes ip classless line con 0 exec-timeout 0 0 transport input none line vty 0 4 end RouterA#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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, * - candidate default U - per-user static route, o - OR /8 is variably subnetted, 4 subnets, 2 masks /24 is directly connected, Loopback /24 is directly connected, Serial /24 is directly connected, Loopback /8 is a summary, 00:10:01, Null /8 is variably subnetted, 2 subnets, 2 masks /8 is a summary, 00:09:55, Null /24 is directly connected, Ethernet0 RouterA#show ip protocols Routing Protocol is "eigrp 75" Outgoing update filter list for all interfaces is Incoming update filter list for all interfaces is efault networks flagged in outgoing updates efault networks accepted from incoming updates EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 EIGRP maximum hopcount 100 EIGRP maximum metric variance 1

5 Redistributing: eigrp 75 Automatic network summarization is in effect Automatic address summarization: /8 for Loopback0, Loopback1, Serial0 Summarizing with metric /8 for Ethernet0 Summarizing with metric Routing for Networks: Routing Information Sources: Gateway istance Last Update (this router) 5 00:11: :11:14 istance: internal 90 external 170 RouterA#sh ip eigrp neighbors IP-EIGRP neighbors for process 75 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) nt Num Se :18: RouterA#show ip eigrp interfaces IP-EIGRP interfaces for process 75 Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Lo0 0 0/0 0 0/ Lo1 0 0/0 0 0/ Se0 1 0/0 0 10/ RouterA#sh ip eigrp topology IP-EIGRP Topology Table for process 75 odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply status P /24, 1 successors, F is via onnected, Loopback0 P /24, 1 successors, F is via onnected, Serial0 P /24, 1 successors, F is via onnected, Loopback1 P /8, 1 successors, F is via Summary (128256/0), Null0

6 P /8, 1 successors, F is via Summary (281600/0), Null0 P /24, 1 successors, F is via onnected, Ethernet0 Et0 0 0/0 0 0/ RouterB#sh run Building configuration... urrent configuration : 891 bytes version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption hostname RouterB memory-size iomem 15 ip subnet-zero ip audit notify log ip audit po max-events 100 ip ssh time-out 120 ip ssh authentication-retries 3 crypto mib ipsec flowmib history tunnel size 200 crypto mib ipsec flowmib history failure size 200 interface BRI0 no ip address shutdown interface FastEthernet0 no ip address shutdown speed auto interface Serial0 bandwidth 64

7 ip address no fair-queue clockrate interface Serial1 bandwidth 64 ip address router eigrp 75 network network auto-summary eigrp log-neighbor-changes ip classless no ip http server ip pim bidir-enable line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 no scheduler allocate end RouterB#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route /8 is variably subnetted, 4 subnets, 2 masks /24 [90/ ] via , 00:02:15, Serial /24 is directly connected, Serial /24 [90/ ] via , 00:02:15, Serial /8 is a summary, 00:02:13, Null /8 is variably subnetted, 5 subnets, 2 masks /24 [90/ ] via , 00:02:11, Serial /24 is directly connected, Serial0

8 /24 [90/ ] via , 00:02:12, Serial /24 [90/ ] via , 00:02:12, Serial /8 is a summary, 00:02:14, Null0 RouterB#sh ip protocols Routing Protocol is "eigrp 75" Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set efault networks flagged in outgoing updates efault networks accepted from incoming updates EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 EIGRP maximum hopcount 100 EIGRP maximum metric variance 1 Redistributing: eigrp 75 Automatic network summarization is in effect Automatic address summarization: /8 for Serial0 Summarizing with metric /8 for Serial1 Summarizing with metric Maximum path: 4 Routing for Networks: Routing Information Sources: Gateway istance Last Update :25:55 (this router) 90 00:25:55 Gateway istance Last Update :26:02 istance: internal 90 external 170 RouterB#sh ip eigrp neighbors IP-EIGRP neighbors for process 75 H Address Interface Hold Uptime SRTT RTO Q Seq Type (sec) (ms) nt Num Se :03: Se :03: RouterB#sh ip eigrp interfaces IP-EIGRP interfaces for process 75 Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Se2 1 0/ / Se0 1 0/ /

9 RouterB#sh ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via ( /128256), Serial0 P /24, 1 successors, F is via ( /128256), Serial2 P /24, 1 successors, F is via onnected, Serial0 P /24, 1 successors, F is via onnected, Serial2 P /24, 1 successors, F is via ( /28160), Serial0 P /24, 1 successors, F is via ( /128256), Serial2 P /24, 1 successors, F is via ( /128256), Serial0 P /8, 1 successors, F is via Summary ( /0), Null0 P /8, 1 successors, F is via Summary ( /0), Null0 odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status via ( /28160), Serial2 Router#sh run Building configuration... urrent configuration : 677 bytes version 12.2 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption hostname "Router" ip subnet-zero

10 interface Loopback0 ip address interface Loopback1 ip address interface Ethernet0 ip address interface Ethernet1 no ip address shutdown interface Serial0 bandwidth 64 ip address clockrate no fair-queue interface Serial1 no ip address shutdown router eigrp 75 network auto-summary ip classless ip http server no cdp run line con 0 line aux 0 line vty 0 4 end Router#sh ip route odes: - connected, S - static, R - RIP, M - mobile, B - BGP

11 - 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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - OR P - periodic downloaded static route /8 [90/ ] via , 00:46:37, Serial /24 is subnetted, 4 subnets is directly connected, Loopback is directly connected, Serial is directly connected, Ethernet is directly connected, Loopback1 Router#show ip protocols Routing Protocol is "eigrp 75" Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set efault networks flagged in outgoing updates efault networks accepted from incoming updates EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 EIGRP maximum hopcount 100 EIGRP maximum metric variance 1 Redistributing: eigrp 75 Automatic network summarization is in effect Maximum path: 4 Routing for Networks: Routing Information Sources: Gateway istance Last Update :40:15 istance: internal 90 external 170 Router#show ip eigrp neighbors IP-EIGRP neighbors for process 75 H Address Interface Hold Uptime SRTT RTO Q Seq Type (sec) (ms) nt Num Se :48: Router#show ip eigrp interfaces IP-EIGRP interfaces for process 75 Xmit Queue Mean Pacing Time Multicast Pending Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes Et0 0 0/0 0 0/ Se0 1 0/ /

12 Lo0 0 0/0 0 0/ Lo1 0 0/0 0 0/ Router#show ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via onnected, Loopback0 P /24, 1 successors, F is via onnected, Serial0 P /24, 1 successors, F is via onnected, Ethernet0 P /24, 1 successors, F is via onnected, Loopback1 P /8, 1 successors, F is via ( / ), Serial0 问题 1: 从 Router 是否可以 ping 通 Router A 的 Loopback0( )? 问题 2: 从 Router 是否可以 ping 通 Router A 的 F0 口 ( )? 实验二 EIGRP 的接口汇总 (Interface Summarization) 在每个路由器上取消自动汇总, 命令如下 : Router(config-router)# no auto-summary 取消自动汇总后,Router 上的输出信息 : RouterB(config-router)#no auto-summary RouterB(config-router)# 00:55:26: %UAL-5-NBRHANGE: IP-EIGRP 75: Neighbor (Serial2) is down: summary configured 00:55:26: %UAL-5-NBRHANGE: IP-EIGRP 75: Neighbor (Serial0) is down: summary configured 1700B(config-router)# 00:55:30: %UAL-5-NBRHANGE: IP-EIGRP 75: Neighbor (Serial0) is up: new adjacency 00:55:30: %UAL-5-NBRHANGE: IP-EIGRP 75: Neighbor (Serial2) is up: new adjacency 然后, 在每个路由器上使用 show ip route, 可以发现 Router 有了到 的路由 取消自动汇总后, 各个路由器的路由表如下 : RouterA#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

13 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, * - candidate default U - per-user static route, o - OR /24 is subnetted, 3 subnets is directly connected, Loopback is directly connected, Serial is directly connected, Loopback /24 is subnetted, 5 subnets [90/ ] via , 00:03:33, Serial [90/ ] via , 00:03:33, Serial [90/ ] via , 00:03:33, Serial [90/ ] via , 00:03:33, Serial is directly connected, Ethernet0 RouterB#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route /24 is subnetted, 3 subnets [90/ ] via , 00:04:33, Serial is directly connected, Serial [90/ ] via , 00:04:33, Serial /24 is subnetted, 5 subnets [90/ ] via , 00:04:49, Serial is directly connected, Serial [90/ ] via , 00:04:49, Serial [90/ ] via , 00:04:49, Serial [90/ ] via , 00:04:34, Serial0 Router#sh ip route odes: - connected, S - static, R - RIP, M - mobile, B - BGP - 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

14 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 - OR P - periodic downloaded static route /24 is subnetted, 3 subnets [90/ ] via , 00:05:03, Serial [90/ ] via , 00:05:18, Serial [90/ ] via , 00:05:03, Serial /24 is subnetted, 5 subnets is directly connected, Loopback is directly connected, Serial is directly connected, Ethernet is directly connected, Loopback [90/ ] via , 00:05:04, Serial0 然而, 这样配置的话, 每个路由器的路由表的开销很大 我们可以使用 EIGRP 的接口汇总来减少路由表的数目 具体命令如下 : Router(config-if)# ip summary-address eigrp autonomous-system-number ip-address mask administrative-distance 住在 Router B, 我们进行如下配置 : interface Serial0 ip address ip summary-address eigrp interface Serial1 ip address ip summary-address eigrp 然后, 使用 show ip route 来观察路由表的变化 RouterA#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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, * - candidate default U - per-user static route, o - OR /8 is variably subnetted, 4 subnets, 2 masks /24 is directly connected, Loopback0

15 /24 is directly connected, Serial /24 is directly connected, Loopback /8 is a summary, 00:24:58, Null /8 is variably subnetted, 2 subnets, 2 masks /16 [90/ ] via , 00:00:05, Serial /24 is directly connected, Ethernet0 RouterB#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route /8 is variably subnetted, 4 subnets, 2 masks /24 [90/ ] via , 00:00:54, Serial /24 is directly connected, Serial /24 [90/ ] via , 00:00:54, Serial /8 is a summary, 00:28:26, Null /8 is variably subnetted, 6 subnets, 2 masks /24 [90/ ] via , 00:01:21, Serial /16 is a summary, 00:15:23, Null /24 is directly connected, Serial /24 [90/ ] via , 00:01:23, Serial /24 [90/ ] via , 00:01:23, Serial /24 [90/ ] via , 00:00:55, Serial0 Router#sh ip route odes: - connected, S - static, R - RIP, M - mobile, B - BGP - 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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - OR P - periodic downloaded static route /8 [90/ ] via , 00:01:53, Serial /24 is subnetted, 5 subnets is directly connected, Loopback is directly connected, Serial is directly connected, Ethernet0

16 is directly connected, Loopback [90/ ] via , 00:01:24, Serial0 问题 3:Host A,B 之间是否可以互相 ping 通? 学员可以尝试对 Router A 进行路由汇总, 并用 show ip router 查看汇总结果 实验三 IGRP/EIGRP 的自动重分布 (Redistribution) 在相同的 AS 号的情况下,IGRP 会自动重分布进去 EIGRP 由于 IGRP 不支持无类别域间路由 (IR), 所以路由器的端口 IP 地址要做一些改变 将 Router A 和 Router B 的 F0 口都 shutdown, 我们暂时不需用到两台主机, 只是观察路由器上路由表的情况 图二参照图二配置好主机和路由器各个端口的 IP 地址 然后, 在 RouterA 上启用 IGRP, 在 Router 上启用 EIGRP, 在 RouterB 上同时启用 IGRP 和 EIGRP 注意自治系统号要统一 可能需要用到的配置命令格式为 : Router(config)# router eigrp autonomous-system-number Router(config)# router igrp autonomous-system-number Router(config-router)# network network-number Router(config-if)# bandwidth kilobits 在 RouterA 和 上使用 show ip route 和 show ip eigrp traffic, 记录你的发现 RouterA#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route

17 I I /24 is subnetted, 1 subnets is directly connected, Serial /8 [100/82125] via , 00:01:02, Serial /8 [100/82625] via , 00:01:02, Serial /24 is subnetted, 1 subnets is directly connected, Loopback0 RouterA#sh ip eigrp traffic ( 空 ) Router#sh ip route odes: - connected, S - static, R - RIP, M - mobile, B - BGP - 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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - OR P - periodic downloaded static route /24 is subnetted, 1 subnets EX [170/ ] via , 00:02:52, Serial /8 is variably subnetted, 2 subnets, 2 masks /24 is directly connected, Serial /8 is a summary, 00:04:06, Null /8 is variably subnetted, 2 subnets, 2 masks /24 is directly connected, Loopback /8 is a summary, 00:04:06, Null0 EX /8 [170/ ] via , 00:01:07, Serial0 Router#sh ip eigrp traffic IP-EIGRP Traffic Statistics for process 75 Hellos sent/received: 225/210 Updates sent/received: 4/3 Queries sent/received: 0/0 Replies sent/received: 0/0 Acks sent/received: 2/3 Input queue high water mark 1, 0 drops SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0 实验四 五 六采用如下的实验拓扑

18 EIGRP /30 64Kbps 2.2 实验四 EIGRP 的带宽控制 S0 Router A 2.1 S0 Router B S /24 F0 F 图三 F / /30 128Kbps S1 2.6 Router 按照拓扑图所示设置主机及路由器端口的 IP 地址及线路带宽, 对各个网段启用 EIGRP 由于使用了非主类网, 记得将自动汇总禁止 配置好各个路由器, 然后使用 show ip route 来观察路由表, 看看网络是否能够正常运作 ( 在主机上使用 ping,tracert 命令 ) 如 Router B 为例, 设置如下 : interface Serial0 bandwidth 64 ip address interface Serial1 bandwidth 128 ip address router eigrp 75 network network no auto-summary 如此类推, 配置好各个路由器, 然后使用 show ip route 来观察路由表, 看看网络是否能够正常运作 ( 在主机上使用 ping,tracert 命令 ) 在各个路由器上使用 show ip eigrp topology,show ip route,show interfaces 观察配置的结果 Router A: show ip eigrp topology show ip route show interfaces Router B: show ip eigrp topology show ip route show interfaces Router : show ip eigrp topology show ip route show interfaces

19 RouterA#sh ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via ( / ), Ethernet0 via ( /28160), Serial0 P /30, 1 successors, F is via onnected, Serial0 P /24, 1 successors, F is via onnected, Ethernet0 P /30, 1 successors, F is via ( / ), Ethernet0 via ( / ), Serial0 RouterA#sh ip route odes: - connected, S - static, R - RIP, M - mobile, B - BGP - 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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - OR P - periodic downloaded static route /24 [90/ ] via , 00:02:38, Ethernet /30 is subnetted, 2 subnets is directly connected, Serial [90/ ] via , 00:02:40, Ethernet /24 is directly connected, Ethernet0 RouterA#sh int s0 Serial0 is up, line protocol is up Hardware is H64570 Internet address is /30 MTU 1500 bytes, BW 64 Kbit, LY usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HL, loopback not set Keepalive set (10 sec) Last input 00:00:01, output 00:00:01, output hang never Last clearing of "show interface" counters 00:23:31 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 79 Queueing strategy: fifo Output queue: 0/40 (size/max)

20 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 125 packets input, 8975 bytes, 0 no buffer Received 43 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored, 0 abort 124 packets output, 7156 bytes, 0 underruns 0 output errors, 0 collisions, 10 interface resets 0 output buffer failures, 0 output buffers swapped out 2 carrier transitions =up SR=up TR=up RTS=up TS=up RouterA#sh int e0 Ethernet0 is up, line protocol is up Hardware is Lance, address is 00e0.1e60.82b6 (bia 00e0.1e60.82b6) Internet address is /24 MTU 1500 bytes, BW Kbit, LY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:02, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 82 packets input, 7602 bytes, 0 no buffer Received 77 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored 0 input packets with dribble condition detected 361 packets output, bytes, 0 underruns 117 output errors, 0 collisions, 5 interface resets 0 babbles, 0 late collision, 0 deferred 117 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out RouterB#show ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via onnected, FastEthernet0 P /30, 1 successors, F is

21 via onnected, Serial1 P /24, 1 successors, F is via ( /281600), Serial0 via ( /281600), Serial1 P /30, 1 successors, F is via onnected, Serial0 RouterB#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route /24 is directly connected, FastEthernet /30 is subnetted, 2 subnets is directly connected, Serial is directly connected, Serial /24 [90/ ] via , 00:08:45, Serial0 RouterB#sh int f0 FastEthernet0 is up, line protocol is up Hardware is PQUI_FE, address is 0006.d7ee.39b6 (bia 0006.d7ee.39b6) Internet address is /24 MTU 1500 bytes, BW Kbit, LY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:05:00, output 00:00:01, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 122 packets input, bytes Received 122 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored 0 watchdog 0 input packets with dribble condition detected 399 packets output, bytes, 0 underruns

22 37 output errors, 0 collisions, 4 interface resets 0 babbles, 0 late collision, 0 deferred 37 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out RouterB#sh int s0 Serial0 is up, line protocol is up Hardware is PowerQUI Serial Internet address is /30 MTU 1500 bytes, BW 64 Kbit, LY usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HL, loopback not set Keepalive set (10 sec) Last input 00:00:03, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 54 Queueing strategy: weighted fair Output queue: 0/1000/64/54 (size/max total/threshold/drops) onversations 0/2/32 (active/max active/max total) Reserved onversations 0/0 (allocated/max allocated) Available Bandwidth 48 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 230 packets input, bytes, 0 no buffer Received 69 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored, 0 abort 250 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 3 interface resets 0 output buffer failures, 0 output buffers swapped out 12 carrier transitions =up SR=up TR=up RTS=up TS=up RouterB#sh int s1 Serial1 is up, line protocol is up Hardware is PowerQUI Serial Internet address is /30 MTU 1500 bytes, BW 128 Kbit, LY usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HL, loopback not set Keepalive set (10 sec) Last input 00:00:03, output 00:00:00, output hang never Last clearing of "show interface" counters 00:28:57 Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec

23 5 minute output rate 0 bits/sec, 0 packets/sec 209 packets input, bytes, 0 no buffer Received 76 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored, 0 abort 222 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 4 interface resets 0 output buffer failures, 0 output buffers swapped out 1 carrier transitions =up SR=up TR=up RTS=up TS=up Router#show ip eigrp topology IP-EIGRP Topology Table for process 75 odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply status P /24, 1 successors, F is via ( /28160), Serial0 P /30, 1 successors, F is via ( / ), Ethernet0 via ( / ), Serial0 P /24, 1 successors, F is via onnected, Ethernet0 P /30, 1 successors, F is via onnected, Serial0 Router#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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, * - candidate default U - per-user static route, o - OR /24 [90/ ] via , 00:13:22, Serial /30 is subnetted, 2 subnets [90/ ] via , 00:13:22, Ethernet is directly connected, Serial /24 is directly connected, Ethernet0 Router#sh int e0 Ethernet0 is up, line protocol is up Hardware is QUI Ethernet, address is b2c.e59c (bia b2c.e59c) Internet address is /24 MTU 1500 bytes, BW Kbit, LY 1000 usec, rely 255/255, load 1/255

24 Encapsulation ARPA, loopback not set, keepalive set (10 sec) ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:02, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 194 packets input, bytes, 0 no buffer Received 189 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored, 0 abort 0 input packets with dribble condition detected 318 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Router#sh int s0 Serial0 is up, line protocol is up Hardware is QUI Serial Internet address is /30 MTU 1500 bytes, BW 128 Kbit, LY usec, rely 255/255, load 1/255 Encapsulation HL, loopback not set, keepalive set (10 sec) Last input 00:00:01, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0 (size/max/drops); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) onversations 0/1/256 (active/max active/max total) Reserved onversations 0/0 (allocated/max allocated) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 317 packets input, bytes, 0 no buffer Received 119 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored, 0 abort 303 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 14 interface resets 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions =up SR=up TR=up RTS=up TS=up 接着, 我们在 RouterA 的 S0 和 RouterB 的 S0 上设置 EIGRP 最多使用 64Kbps 链路带宽的 100% 以 Router B 为例 : interface Serial0

25 bandwidth 64 ip address ip bandwidth-percent eigrp interface Serial1 bandwidth 128 ip address 在 Router 上使用 show ip eigrp topology,show ip route,show interfaces 观察配置的结果 Router#sh ip eigrp topology IP-EIGRP Topology Table for process 75 odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply status P /24, 1 successors, F is via ( /28160), Serial0 P /30, 1 successors, F is via ( / ), Ethernet0 via ( / ), Serial0 P /24, 1 successors, F is via onnected, Ethernet0 P /30, 1 successors, F is via onnected, Serial0 Router#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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, * - candidate default U - per-user static route, o - OR /24 [90/ ] via , 00:30:42, Serial /30 is subnetted, 2 subnets [90/ ] via , 00:30:43, Ethernet is directly connected, Serial /24 is directly connected, Ethernet0 Router#sh int s0 Serial0 is up, line protocol is up Hardware is QUI Serial Internet address is /30

26 MTU 1500 bytes, BW 128 Kbit, LY usec, rely 255/255, load 1/255 Encapsulation HL, loopback not set, keepalive set (10 sec) Last input 00:00:00, output 00:00:01, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0 (size/max/drops); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) onversations 0/1/256 (active/max active/max total) Reserved onversations 0/0 (allocated/max allocated) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 698 packets input, bytes, 0 no buffer Received 252 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored, 0 abort 663 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 14 interface resets 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions =up SR=up TR=up RTS=up TS=up Router#sh int e0 Ethernet0 is up, line protocol is up Hardware is QUI Ethernet, address is b2c.e59c (bia b2c.e59c) Internet address is /24 MTU 1500 bytes, BW Kbit, LY 1000 usec, rely 255/255, load 1/255 Encapsulation ARPA, loopback not set, keepalive set (10 sec) ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:01, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 421 packets input, bytes, 0 no buffer Received 411 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 R, 0 frame, 0 overrun, 0 ignored, 0 abort 0 input packets with dribble condition detected 673 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out 体会 EIGRP 的增量更新, 键入 debug eigrp fsm, 接着, 将 Router Fastethernet 口上的网线拔下,

27 观察这时候的 debug 信息 Router#debug eigrp fsm EIGRP FSM Events/Actions debugging is on Router# 00:15:20: UAL: rcvquery: /24 via metric / , R is :15:20: UAL: Find FS for dest /24. F is , R is :15:20: UAL: metric / not found min is :15:20: UAL: est /24 (Split Horizon) not entering active state. 00:15:20: UAL: send REPLY(r1/n1) about /24 to :15:20: UAL: Removing dest /24, nexthop :15:20: UAL: No routes. Flushing dest /24 重新把网线插上 00:15:50: UAL: dest( /24) not active 00:15:50: UAL: rcvupdate: /24 via metric / :15:50: UAL: Find FS for dest /24. F is , R is found 00:15:50: UAL: RT installed /24 via :15:50: UAL: Send update about /24. Reason: metric chg 00:15:50: UAL: Send update about /24. Reason: new if 实验五 EIGRP 的不等成本负载平衡 (Unequal-ost Load Balancing with IGRP) 配置负载均衡, 在 RouterB 中键入如下命令 : RouterB(config)#router eigrp 75 RouterB(config-router)#variance 10 通过 show ip route 命令查看 RouterB 的路由表 启用 variace 命令前的路由表 Router#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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, * - candidate default U - per-user static route, o - OR 注 启用 variace 命令后的路由表 RouterB#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route /24 [90/ ] via , 00:30:42, Serial0

28 /30 is subnetted, 2 subnets [90/ ] via , 00:30:43, Ethernet is directly connected, Serial /24 is directly connected, Ethernet0 如果观察不到以上结果, 可以先保存配置, 然后重启一遍路由器 /24 is directly connected, FastEthernet /30 is subnetted, 2 subnets is directly connected, Serial is directly connected, Serial /24 [90/ ] via , 00:00:08, Serial1 [90/ ] 00:00:08, Serial0 via , 接着, 在 Host 上通过 ping t -r 3 命令验证 variance 命令 :\>ping t -r 3 Pinging with 32 bytes of data: Reply from : bytes=32 time=21ms TTL=253 Route: > > Reply from : bytes=32 time=20ms TTL=253 Route: > > Reply from : bytes=32 time=20ms TTL=253 Route: > > Reply from : bytes=32 time=20ms TTL=253 Route: > > Reply from : bytes=32 time=20ms TTL=253 Route: > > Reply from : bytes=32 time=20ms TTL=253 Route: > > Ping statistics for : Packets: Sent = 6, Received = 6, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 20ms, Maximum = 21ms, Average = 20ms ontrol- ^

29 可见, 没 3 个数据包中, 有两个经 走, 另一个经 走, 证明不等成本负载平衡生效 实验六 EIGRP 的参数修改 修改 hello-interval 和 hold-time 根据 isco 公司关于 EIGRP 的白皮书, 默认情况下, 在高带宽链路上,EIGRP 每 5 秒发送一次 hello 包, 在低带宽多点链路上,EIGRP 每 60 秒发送一次 hello 包 而 hold time 的默认时间是 注 hello 包发送时间的 3 倍 即高带宽链路上的 hold time 是 15 秒, 低带宽链路上的 hold time 是 180 秒 我们可以用 ip hello-interval eigrp 和 ip hold-time eigrp 命令更改 hello 包发送时间和 hold time 在没有更改前, 先用 show ip eigrp neighbor 命令查看一下两个 timer RouterB#sh ip eigrp nei IP-EIGRP neighbors for process 75 H Address Interface Hold Uptime SRTT RTO Q Seq Type (sec) (ms) nt Num Se :17: Se :36: 然后我们在 RouterB 上, 把 hello interval 改成 10 秒,holdtime 改成 30 秒 再在 Router 上用 show ip eigrp neighbor 命令查看 : Router#sh ip eigrp nei IP-EIGRP neighbors for process 75 H Address Interface Hold Uptime SRTT RTO Q Seq Type (sec) (ms) nt Num Fa :05: Se :17: 我们也可以通过 debug eigrp packets 命令查看 : 01:38:55: EIGRP: Received HELLO on FastEthernet0 nbr :38:55: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 peerq un/rely 0/0 01:38:55: EIGRP: Sending HELLO on Serial0 01:38:55: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 01:38:55: EIGRP: Sending HELLO on FastEthernet0 01:38:55: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 01:38:57: EIGRP: Received HELLO on Serial0 nbr :38:57: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 peerq un/rely 0/0 01:38:59: EIGRP: Received HELLO on FastEthernet0 nbr :38:59: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 peerq un/rely 0/0 01:39:00: EIGRP: Sending HELLO on Serial0 01:39:00: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 01:39:00: EIGRP: Sending HELLO on FastEthernet0 01:39:00: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 01:39:04: EIGRP: Received HELLO on FastEthernet0 nbr :39:04: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 peerq un/rely 0/0 01:39:04: EIGRP: Sending HELLO on Serial0 01:39:04: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0

30 01:39:05: EIGRP: Sending HELLO on FastEthernet0 01:39:05: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 01:39:07: EIGRP: Received HELLO on Serial0 nbr :39:07: AS 75, Flags 0x0, Seq 0/0 idbq 0/0 iidbq un/rely 0/0 peerq un/rely 0/0 EIGRP sends hello packets every 5 seconds on high bandwidth links and every 60 seconds on low bandwidth multipoint links. 5-second hello: broadcast media, such as Ethernet, Token Ring, and FI point-to-point serial links, such as PPP or HL leased circuits, Frame Relay point-to-point subinterfaces, and ATM point-to-point subinterfaces high bandwidth (greater than T1) multipoint circuits, such as ISN PRI and Frame Relay 60-second hello: multipoint circuits T1 bandwidth or slower, such as Frame Relay multipoint interfaces, ATM multipoint interfaces, ATM switched virtual circuits, and ISN BRIs The rate at which EIGRP sends hello packets is called the hello interval, and you can adjust it per interface with the ip hello-interval eigrp command. The hold time is the amount of time that a router will consider a neighbor alive without receiving a hello packet. The hold time is typically three times the hello interval, by default, 15 seconds and 180 seconds. You can adjust the hold time with the ip hold-time eigrp command. Note that if you change the hello interval, the hold time is not automatically adjusted to account for this change - you must manually adjust the hold time to reflect the configured hello interval. It is possible for two routers to become EIGRP neighbors even though the hello and hold timers don't match. The hold time is included in the hello packets so each neighbor should stay alive even though the hello interval and hold timers don't match. isco - White Paper: EIGRP 五个 K 值的修改 ( 选做 ) 在 RouterB 上先用 show ip route,show ip eigrp topology, 观察到 网络的度量 分别在 RouterA 和 Router 上改变 eigrp 的参数, 使用如下的命令 : RouterA(config-router)#metric weights 0 K1 K2 K3 K4 K5 再次在 RouterB 上 show ip route, show ip eigrp topology, 观察是否已经修改了 eigrp 的度量 K1=1,K2=0,K3=1,K4=0,K5=0( 默认 ) K1=K2=K3=K4=K5=1 RouterA#sh ip route odes: - connected, S - static, R - RIP, M - mobile, B - BGP - 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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - OR P - periodic downloaded static route RouterA#sh ip route odes: - connected, S - static, R - RIP, M - mobile, B - BGP - 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, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - OR P - periodic downloaded static route /24 [90/ ] via , 00:09:56, Ethernet /30 is subnetted, 2 subnets is directly connected, Serial [90/ ] via , 00:09:56, Ethernet /24 is directly connected, Ethernet /24 [90/80541] via , 00:03:12, Ethernet /30 is subnetted, 2 subnets is directly connected, Serial [90/80531] via , 00:03:12, Ethernet /24 is directly connected, Ethernet0

31 RouterA#sh ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via ( / ), Ethernet0 via ( /28160), Serial0 P /30, 1 successors, F is via onnected, Serial0 P /24, 1 successors, F is via onnected, Ethernet0 P /30, 1 successors, F is via ( / ), Ethernet0 via ( / ), Serial0 RouterB#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route /24 is directly connected, FastEthernet /30 is subnetted, 2 subnets is directly connected, Serial is directly connected, Serial /24 [90/ ] via , 00:11:47, Serial0 [90/ ] via , 00:11:47, Serial1 RouterB#sh ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via onnected, FastEthernet0 P /30, 1 successors, F is via onnected, Serial1 P /24, 1 successors, F is via ( /281600), Serial0 via ( /281600), Serial1 P /30, 1 successors, F is via onnected, Serial0 Router#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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, * - candidate default U - per-user static route, o - OR /24 [90/ ] via , 00:13:37, Serial0 RouterA#sh ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via (80541/80441), Ethernet0 via (158872/110), Serial0 P /30, 1 successors, F is via onnected, Serial0 P /24, 1 successors, F is 1103 via onnected, Ethernet0 P /30, 1 successors, F is via (80531/80431), Ethernet0 via (160862/80431), Serial0 RouterB#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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 - OR P - periodic downloaded static route /24 is directly connected, FastEthernet /30 is subnetted, 2 subnets is directly connected, Serial is directly connected, Serial /24 [90/80531] via , 00:04:28, Serial0 [90/158962] via , 00:04:28, Serial1 RouterB#sh ip eigrp topology IP-EIGRP Topology Table for AS(75)/I( ) odes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P /24, 1 successors, F is via onnected, FastEthernet0 P /30, 1 successors, F is via onnected, Serial1 via (160962/158962), Serial0 P /24, 1 successors, F is via (80531/1103), Serial0 via (158962/1103), Serial1 P /30, 1 successors, F is via onnected, Serial0 via (160962/80531), Serial1 Router#sh ip route odes: - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP - 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, * - candidate default U - per-user static route, o - OR /24 [90/80441] via , 00:06:14, Serial0