EIGRP负载均衡配置
1、 实验目的:
通过本次的实验,我们可以掌握如技能
1) EIGRP等价负载均衡的实现方法。
2) EIGRP非等价负载均衡的实现方法。
3) 修改EIGRP度量值的方法。
4) 可行距离(FD)、通告距离(RD)、以及可行性条件(FC)的深层理解。
2、 实验拓扑图:
3、 实验步骤:
(1) 根据拓扑图,配置各个路由器的接口地址,想必大家都会了,这里就不在详解了。
(2) 配置EIGRP协议,并宣告网络
R1(config)#router eigrp 1
R1(config-router)#no auto-summary
R1(config-router)#net
R1(config-router)#network 192.168.1.0
R1(config-router)#net
R1(config-router)#network 19.168.4.0
R2(config)#router eigrp 1
R2(config-router)#no auto-summary
R2(config-router)#net
R2(config-router)#network 192.168.1.0
R2(config-router)#net
R2(config-router)#network 192.168.2.0
R2(config-router)#network 2.2.2.0 255.255.255.0
R3(config)#router eigrp 1
R3(config-router)#no auto-summary
R3(config-router)#net
R3(config-router)#network 192.168.3.0
R3(config-router)#network 192.168.2.0
R3(config-router)#
R4(config)#router eigrp 1
R4(config-router)#no auto-summary
R4(config-router)#network 192.168.3.0
R4(config-router)#net
R4(config-router)#network 192.168.4.0
R4(config-router)#network 4.4.4.0 255.255.255.0
R4(config-router)#
(3) 实验测试
从路由器R1ping各个路由器结果:
R1#
R1#ping 192.168.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 47/59/62 ms
R1#ping 192.168.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 78/84/94 ms
R1#
R1#
R1#ping 192.168.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 19/28/32 ms
R1#ping 192.168.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 78/87/94 ms
R1#ping 192.168.4.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.4.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 17/27/32 ms
R1#ping 192.168.4.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.4.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/12/16 ms
R1#
以上出现了一串!!!!!表明各个路由器都可以通信了!!!!!!
下面来查看路由表情况
R4#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
2.0.0.0/24 is subnetted, 1 subnets
D 2.2.2.0 [90/21152000] via 192.168.3.1, 00:01:04, Serial2/0
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
D 192.168.1.0/24 [90/21536000] via 192.168.3.1, 00:08:21, Serial2/0
D 192.168.2.0/24 [90/21024000] via 192.168.3.1, 00:08:21, Serial2/0
C 192.168.3.0/24 is directly connected, Serial2/0
C 192.168.4.0/24 is directly connected, FastEthernet0/0
R4#
本实验只关注路由器R2的lookback0,虽然R4到达R2的lookback0有两条路径,但是路由器会将FD最小的放入路由表,选择s2/0接口。那么另外一条是不是可行后继路由呢?我们可以看一下R4的拓扑表:
R4#show ip eigrp top
R4#show ip eigrp topology
IP-EIGRP Topology Table for AS 1
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - Reply status
P 192.168.3.0/24, 1 successors, FD is 20512000
via Connected, Serial2/0
P 192.168.2.0/24, 1 successors, FD is 21024000
via 192.168.3.1 (21024000/20512000), Serial2/0
P 192.168.1.0/24, 1 successors, FD is 21536000
via 192.168.3.1 (21536000/21024000), Serial2/0
P 192.168.4.0/24, 1 successors, FD is 28160
via Connected, FastEthernet0/0
P 2.2.2.0/24, 1 successors, FD is 21152000
via 192.168.3.1 (20642560/20640000), Serial2/0
via 192.168.4.2 (21152000/20640000), FastEthernet0/0
P 4.4.4.0/24, 1 successors, FD is 128256
via Connected, Loopback0
R4#
从上面是输出可以看出,第二条路径的AD是20640000,而最优路由的FD是20642560,AD<FD,满足可行性条件,所以第二条路径在最优路由的可行后继路由。
通过适当的配置,就可以在路由器R4上看到R2的loopback0的路由条目的等价的,从而实现了等价的负载均衡。根据前面讲的EIGRP度量值的计算公式,这两条路径的最小带宽是相同的,只要的他妈的延迟之和相同,就是等价路由。因此在R4上做如下配置:
R4(config)#interface fastEthernet 0/0
R4(config-if)#delay 2000
R4(config-if)#end
在查看一下路由表:
R4#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
2.0.0.0/24 is subnetted, 1 subnets
D 2.2.2.0 [90/21152000] via 192.168.3.1, 00:22:27, Serial2/0
[90/21152000] via 192.168.3.1, 00:22:27, FastEthernet0/0
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
D 192.168.1.0/24 [90/21536000] via 192.168.3.1, 00:29:44, Serial2/0
D 192.168.2.0/24 [90/21024000] via 192.168.3.1, 00:29:44, Serial2/0
C 192.168.3.0/24 is directly connected, Serial2/0
C 192.168.4.0/24 is directly connected, FastEthernet0/0
R4#
由上面可以看出路由条目2.2.2.0确实有两条等价路由,表明EIGRP是支持负载均衡的。
OK,实验到此就结束了!!!!