CCNP之BSCI实验5:配置EIGRP非等价负载均衡
实验目的：
1. 掌握EIGRP的非等价负载均衡的条件
2. 掌握EIGRP的METRIC值修改方法
3. 掌握EIGRP的AD,FD,FC,SUCCESSOR,FS
实验拓扑:
实验步骤：
1. 按拓扑图配置IP，并用PING检验各个路由器的直连口的互通性
2. 配置EIGRP路由协议。
3. 观察R1到达R3的192.168.1.0/24网络路由
4. 要实现非等价负载均衡的条件：FS的FD<最优路由的FD*Varince
5. 要成为FS，需要满足可以条件：AD<FD
6. 查看R1的拓扑表
r1(config)#int s1/0
r1(config-if)#ip add 172.16.3.2 255.255.255.0
r1(config-if)#encapsulation frame-relay 帧中继封装
r1(config-if)#no sh
r1(config-if)#frame map ip 172.16.3.1 101 broadcast
r1(config-if)#do sh frame-relay map
Serial1/0 (up): ip 172.16.3.1 dlci 101(0x65,0x1850), static,
broadcast,
CISCO, status defined, active
r1(config-if)#
r1(config-if)#
r1(config-if)#exit
r1(config)#int f0/0
r1(config-if)#ip add 172.16.1.1 255.255.255.0
r1(config-if)#no sh
r1(config-if)#
*Mar 1 00:15:13.783: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Mar 1 00:15:14.783: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
r1(config-if)#exit
r1(config)#router eigrp 1
r1(config-router)#no au
r1(config-router)#net 172.16.0.0
r1(config-router)#
*Mar 1 00:17:08.975: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.3.1 (Serial1/0) is up: new adjacency
r1(config-router)#
*Mar 1 00:18:40.103: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.1.2 (FastEthernet0/0) is up: new adjacency
r1(config-router)#do sh ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, 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
172.16.0.0/24 is subnetted, 3 subnets
C 172.16.1.0 is directly connected, FastEthernet0/0
D 172.16.2.0 [90/2172416] via 172.16.1.2, 00:00:13, FastEthernet0/0
C 172.16.3.0 is directly connected, Serial1/0
D 192.168.1.0/24 [90/2297856] via 172.16.3.1, 00:00:13, Serial1/0
r1(config-router)#do sh ip eigrp to all-links 显示EIGRP拓扑表所有条目
IP-EIGRP Topology Table for AS(1)/ID(172.16.3.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 192.168.1.0/24, 1 successors, FD is 2297856, serno 4
via 172.16.3.1 (2297856/128256), Serial1/0
via 172.16.1.2 (2300416/2297856), FastEthernet0/0
P 172.16.1.0/24, 1 successors, FD is 28160, serno 1
via Connected, FastEthernet0/0
P 172.16.2.0/24, 1 successors, FD is 2172416, serno 5
via 172.16.1.2 (2172416/2169856), FastEthernet0/0
via 172.16.3.1 (2681856/2169856), Serial1/0
P 172.16.3.0/24, 1 successors, FD is 2169856, serno 2
via Connected, Serial1/0
r1(config-router)#do sh ip eigrp topology 查看拓扑表，可显示EIGRP的后继和可行后继
IP-EIGRP Topology Table for AS(1)/ID(172.16.3.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 192.168.1.0/24, 1 successors, FD is 2297856
via 172.16.3.1 (2297856/128256), Serial1/0
P 172.16.1.0/24, 1 successors, FD is 28160
via Connected, FastEthernet0/0
P 172.16.2.0/24, 1 successors, FD is 2172416
via 172.16.1.2 (2172416/2169856), FastEthernet0/0
via 172.16.3.1 (2681856/2169856), Serial1/0
P 172.16.3.0/24, 1 successors, FD is 2169856
via Connected, Serial1/0
从上面可以看出：R1到R3的192.168.1.1，没有经过R2路由条目，
sh ip eigrp to all-links和sh ip eigrp topology显示比较，P 192.168.1.0/24, 1 successors, FD is 2297856, serno 4
via 172.16.3.1 (2297856/128256), Serial1/0
via 172.16.1.2 (2300416/2297856), FastEthernet0/0
要成为FS，需要满足可以条件：AD<FD，所以R1—R3没有可行后继。
r1(config-router)#do sh ip eigrp topology 在修竹R2的S1/0的带宽后再查看拓扑表
IP-EIGRP Topology Table for AS(1)/ID(172.16.3.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 192.168.1.0/24, 1 successors, FD is 2294016
via 172.16.1.2 (2294016/2291456), FastEthernet0/0
via 172.16.3.1 (2297856/128256), Serial1/0
可以看出R1—R3的LOO1，R3成为可行后继。
P 172.16.1.0/24, 1 successors, FD is 28160
via Connected, FastEthernet0/0
P 172.16.2.0/24, 1 successors, FD is 2166016
via 172.16.1.2 (2166016/2163456), FastEthernet0/0
P 172.16.3.0/24, 1 successors, FD is 2169856
via Connected, Serial1/0
r1(config-router)#variance 2 实现非等价负载均衡。
r1(config-router)#exit
r1(config)#do sh ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, 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
172.16.0.0/24 is subnetted, 3 subnets
C 172.16.1.0 is directly connected, FastEthernet0/0
D 172.16.2.0 [90/2166016] via 172.16.1.2, 00:00:08, FastEthernet0/0
C 172.16.3.0 is directly connected, Serial1/0
D 192.168.1.0/24 [90/2297856] via 172.16.3.1, 00:00:08, Serial1/0
[90/2294016] via 172.16.1.2, 00:00:08, FastEthernet0/0
r2(config)#
r2(config)#int f0/0
r2(config-if)#ip add 172.16.1.2 255.255.255.0
r2(config-if)#no sh
r2(config-if)#exit
r2(config)#int s
*Mar 1 00:04:56.523: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Mar 1 00:04:57.523: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
r2(config)#int s1/0
r2(config-if)#clo r 64000
r2(config-if)#ip add 172.16.2.2 255.255.255.0
r2(config-if)#no sh
r2(config-if)#exit
r2(config)#router eigrp 1
r2(config-router)#no au
r2(config-router)#net 172.16.0.0
*Mar 1 00:06:00.675: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.2.1 (Serial1/0) is up: new adjacency
*Mar 1 00:06:00.679: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.1.1 (FastEthernet0/0) is up: new adjacency
r2(config-router)#exit
r2(config)#int s1/0
r2(config-if)#bandwidth 1550
r3(config)#int loo 1
r3(config-if)#ip add
*Mar 1 00:02:44.487: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up
r3(config-if)#ip add 192.168.1.1 255.255.255.0
r3(config-if)#exit
r3(config)#int s0/1
r3(config-if)#ip add 172.16.2.1 255.255.255.0
r3(config-if)#no sh
r3(config-if)#exit
r3(config)#
*Mar 1 00:03:41.659: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up
*Mar 1 00:03:42.659: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
r3(config)#int s0/0
r3(config-if)#ip add 172.16.3.1 255.255.255.0
r3(config-if)#no sh
*Mar 1 00:04:08.675: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up
*Mar 1 00:04:09.675: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
r3(config-if)#encapsulation frame-relay
r3(config-if)#
*Mar 1 00:04:59.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
r3(config-if)#frame map ip
*Mar 1 00:05:19.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
r3(config-if)#frame map ip 172.16.3.1 202 broadcast
r3(config-if)#do sh frame-relay map
Serial0/0 (up): ip 172.16.3.1 dlci 202(0xCA,0x30A0), static,
broadcast,
CISCO, status defined, active
r3(config-if)#
r3(config-if)#no frame map ip 172.16.3.1 202 broadcast
r3(config-if)#frame map ip 172.16.3.2 202 broadcast
r3(config-if)#
r3(config-if)#do sh frame map
Serial0/0 (up): ip 172.16.3.2 dlci 202(0xCA,0x30A0), static,
broadcast,
CISCO, status defined, active
r3(config-if)#exit
r3(config)#router eigrp 1
r3(config-router)#no au
r3(config-router)#net 172.16.0.0
r3(config-router)#net 192.168.1.0
r3(config-router)#
*Mar 1 00:17:08.147: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.3.2 (Serial0/0) is up: new adjacency
r3(config-router)#
*Mar 1 00:18:39.391: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.2.2 (Serial0/1) is up: new adjacency
r3(config-router)#do sh ip eigrp topology
IP-EIGRP Topology Table for AS(1)/ID(192.168.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 192.168.1.0/24, 1 successors, FD is 128256
via Connected, Loopback1
P 172.16.1.0/24, 2 successors, FD is 2172416
via 172.16.2.2 (2172416/28160), Serial0/1
via 172.16.3.2 (2172416/28160), Serial0/0
P 172.16.2.0/24, 1 successors, FD is 2169856
via Connected, Serial0/1
via 172.16.3.2 (2684416/2166016), Serial0/0
P 172.16.3.0/24, 1 successors, FD is 2169856
via Connected, Serial0/0
本文转自gauyanm 51CTO博客，原文链接：http://blog.51cto.com/gauyanm/287745，如需转载请自行联系原作者
