Redistribute
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Cisco IOS Software, 3700 Software (C3745-ADVIPSERVICESK9-M), Version 12.4(4)T, RELEASE SOFTWARE (fc1)
拓扑结构
如下图所示,R1与R2之间使用静态路由(默认路由),R1与R3之间使用RIP,R1与R4之间使用EIGRP,R1与R5之间使用OSPF。
操作过程如下
一、基本配置
按网络拓扑图设置端口IP,确保相邻端口之间能够相互ping通。
配置略。
二、路由配置
为方便测试,在配置动态路由时,使用no auto-summary命令关闭自动汇总(OSPF默认是不汇总的,也没有no auto-summary命令)。
R1,各端口分别按要求配置不同的路由
R1(config)#ip route 2.2.2.0 255.255.255.0 192.168.2.2
R1(config)#router rip
R1(config-router)#net 192.168.3.0
R1(config-router)#version 2
R1(config-router)#no auto-summary
R1(config-router)#exit
R1(config)#router eigrp 100
R1(config-router)#net 192.168.4.0
R1(config-router)#no auto-summary
R1(config-router)#exit
R1(config)#router ospf 1
R1(config-router)#net 192.168.5.0 0.0.0.255 area 0
R1(config-router)#exit
------------------------------------
R2,配置默认路由
R2(config)#ip route 0.0.0.0 0.0.0.0 192.168.2.1
------------------------------------
R3,配置RIP
R3(config)#router rip
R3(config-router)#net 192.168.3.0
R3(config-router)#net 3.3.3.0
R3(config-router)#version 2
R3(config-router)#no auto-summary
R3(config-router)#exit
------------------------------------
R4,配置EIGRP
R4(config)#router eigrp 100
R4(config-router)#net 192.168.4.0
*Mar 1 00:17:48.019: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.4.1 (FastEthernet1/4) is up: new adjacency
R4(config-router)#net 4.4.4.0
R4(config-router)#no auto-summary
*Mar 1 01:08:34.239: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 192.168.4.1 (FastEthernet1/4) is resync: summary configured
R4(config-router)#exit
------------------------------------
R5,配置OSPF
R5(config)#router ospf 1
R5(config-router)#net 192.168.5.0 0.0.0.255 area 0
*Mar 1 00:19:05.547: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.5.1 on FastEthernet1/5 from LOADING to FULL, Loading Done
R5(config-router)#net 5.5.5.0 0.0.0.255 area 0
R5(config-router)#exit
------------------------------------
配置好路由后,因为R1处于网络边界,且同时运行了不同的路由协议,所在R1可以学习到整个网络的完整路由。show ip route命令查看R1路由,如下:
R1#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
2.0.0.0/24 is subnetted, 1 subnets
S 2.2.2.0 [1/0] via 192.168.2.2
3.0.0.0/24 is subnetted, 1 subnets
R 3.3.3.0 [120/1] via 192.168.3.3, 00:00:28, FastEthernet1/3
4.0.0.0/24 is subnetted, 1 subnets
D 4.4.4.0 [90/156160] via 192.168.4.4, 00:02:16, FastEthernet1/4
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/2] via 192.168.5.5, 01:09:20, FastEthernet1/5
C 192.168.4.0/24 is directly connected, FastEthernet1/4
C 192.168.5.0/24 is directly connected, FastEthernet1/5
C 192.168.2.0/24 is directly connected, FastEthernet1/2
C 192.168.3.0/24 is directly connected, FastEthernet1/3
------------------------------------
R2、R3、R4、R5之间,由于路由协议的不相同,当前情况下是相互看不到的。需要在R1上进行重分发。
三、配置重分发
重分发的配置是在边界路由器,即R1上设置的。
1、静态路由与RIP的重分发
R1(config)#router rip
R1(config-router)#redistribute connected !把直连路由分布到路由协议中
R1(config-router)#redistribute static !将静态路由重分发到RIP中
------------------------------------
配置结束后,在R2仍然只能看默认路由,但R3上已经可以看到到达R2的路由了,并且R2 ping 3.3.3.3,R3 ping 2.2.2.2都是通的。
另外,配置结束后,在R3上也可以看到到达192.168.4.0、192.168.5.0网段的路由,但此时的R3并不能ping通R4、R5,是因为R1没有对ospf、eigrp进行重分发。
查看此时R2和R3的路由表及ping测试:
R2#sh ip route
……
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
C 192.168.2.0/24 is directly connected, FastEthernet1/2
S* 0.0.0.0/0 [1/0] via 192.168.2.1
------------------------------------
R2#ping 3.3.3.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/34/64 ms
------------------------------------
R3#sh ip route
……
R 2.0.0.0/8 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
R 192.168.4.0/24 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
R 192.168.5.0/24 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
R 192.168.2.0/24 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
C 192.168.3.0/24 is directly connected, FastEthernet1/3
------------------------------------
R3#ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/39/64 ms
------------------------------------
2、静态路由与EIGRP的重分发
R1(config)#router eigrp 100
R1(config-router)#redistribute connected
R1(config-router)#redistribute static !将静态路由重分发到eigrp中
------------------------------------
配置结束后,在R2上仍然只能看默认路由,但R4上已经可以看见到达R2的路由了,并且R2 ping 4.4.4.4,R4 ping 2.2.2.2都是通的。
查看此时R4的路由表:
R4#sh ip route
……
2.0.0.0/24 is subnetted, 1 subnets
D EX 2.2.2.0 [170/30720] via 192.168.4.1, 01:14:10, FastEthernet1/4
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
C 192.168.4.0/24 is directly connected, FastEthernet1/4
D EX 192.168.5.0/24 [170/30720] via 192.168.4.1, 01:14:10, FastEthernet1/4
D EX 192.168.2.0/24 [170/30720] via 192.168.4.1, 01:14:10, FastEthernet1/4
D EX 192.168.3.0/24 [170/30720] via 192.168.4.1, 01:14:10, FastEthernet1/4
------------------------------------
3、静态路由与OSPF的重分发
R1(config)#router ospf 1
R1(config-router)#redistribute connected
% Only classful networks will be redistributed
R1(config-router)#redistribute static subnets !将静态路由重分发到ospf中
% Only classful networks will be redistributed
------------------------------------
注意,把路由重分发到OSPF中,后面要写subnets选项,否则除主类以外的子网不能被重新分发进路由表。以上命令中,如果不加subnets字段,R2可ping 通5.5.5.5,但R5 ping 不通2.2.2.2(R5可以ping通R2)。
配置结束后,在R2上仍然只能看静态路由(默认路由),但R5上已经可以看见到达R2的路由了,并且R2 ping 5.5.5.5,R5 ping 2.2.2.2都是通的。
查看此时R5的路由表:
R5#sh ip route
……
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
O E2 192.168.4.0/24 [110/20] via 192.168.5.1, 01:14:13, FastEthernet1/5
C 192.168.5.0/24 is directly connected, FastEthernet1/5
O E2 192.168.2.0/24 [110/20] via 192.168.5.1, 01:14:13, FastEthernet1/5
O E2 192.168.3.0/24 [110/20] via 192.168.5.1, 01:14:13, FastEthernet1/5
------------------------------------
4、RIP与EIGRP重分发
R1(config)#router rip
R1(config-router)#redistribute eigrp 100 metric 10 !将eigrp重分发到rip
R1(config-router)#exit
R1(config)#router eigrp 100
R1(config-router)#redistribute rip metric 10000 100 255 1 1500 !将rip重分发到eigrp
------------------------------------
注意,将eigrp重分发到rip时,必须指明度量,即命令redistribute eigrp 100 metric 10,如果没有“metric 10”,则R3看不到R4的路由。
重分发路由协议到eigrp时,也必须指度量,并且要指明带宽等,命令“metric 10000 100 255 1 1500”中的五个参数一定要正确,否则会报错“% Incomplete command”。这五个参数中,唯一可以修改的是带宽值,可根据实际情况设置,其他4个参数不能改。五个参数如下:
Bandwidth in kilobytes=10000
Delay in 10s of microseconds=100
Reliability=255(maximum)
Loading=1(minimum)
Maximum Transmission Unit=1500
配置完成后,在R3、R4上可以看到彼此之间的路由了。
查看此时R3及R4的路由表:
R3#sh ip route
……
2.0.0.0/24 is subnetted, 1 subnets
R 2.2.2.0 [120/1] via 192.168.3.1, 00:00:23, FastEthernet1/3
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
4.0.0.0/24 is subnetted, 1 subnets
R 4.4.4.0 [120/10] via 192.168.3.1, 00:00:23, FastEthernet1/3
R 192.168.4.0/24 [120/1] via 192.168.3.1, 00:00:23, FastEthernet1/3
R 192.168.5.0/24 [120/1] via 192.168.3.1, 00:00:23, FastEthernet1/3
R 192.168.2.0/24 [120/1] via 192.168.3.1, 00:00:23, FastEthernet1/3
C 192.168.3.0/24 is directly connected, FastEthernet1/3
------------------------------------
R4#sh ip route
……
2.0.0.0/24 is subnetted, 1 subnets
D EX 2.2.2.0 [170/30720] via 192.168.4.1, 01:32:39, FastEthernet1/4
3.0.0.0/24 is subnetted, 1 subnets
D EX 3.3.3.0 [170/284160] via 192.168.4.1, 00:02:12, FastEthernet1/4
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
C 192.168.4.0/24 is directly connected, FastEthernet1/4
D EX 192.168.5.0/24 [170/30720] via 192.168.4.1, 01:32:39, FastEthernet1/4
D EX 192.168.2.0/24 [170/30720] via 192.168.4.1, 01:32:39, FastEthernet1/4
D EX 192.168.3.0/24 [170/30720] via 192.168.4.1, 01:32:39, FastEthernet1/4
------------------------------------
5、RIP与OSPF重分发
R1(config)#router rip
R1(config-router)#redistribute ospf 1 metric 10
R1(config-router)#exit
R1(config)#router ospf 1
R1(config-router)#redistribute rip metric 200 subnets
------------------------------------
注意,将ospf重分发到rip时,必须指明度量,即命令redistribute ospf 1 metric 10。
将rip重分发到ospf时,也必须指度量,并且使用subnets选项,否则R5看不到R3的路由。subnets选项可以确保RIP网络中的无类子网路由能够正确的被发布。
配置完成后,在R3、R5上可以看到彼此之间的路由了。
R3#sh ip route
……
2.0.0.0/24 is subnetted, 1 subnets
R 2.2.2.0 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
4.0.0.0/24 is subnetted, 1 subnets
R 4.4.4.0 [120/10] via 192.168.3.1, 00:00:08, FastEthernet1/3
5.0.0.0/32 is subnetted, 1 subnets
R 5.5.5.5 [120/10] via 192.168.3.1, 00:00:08, FastEthernet1/3
R 192.168.4.0/24 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
R 192.168.5.0/24 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
R 192.168.2.0/24 [120/1] via 192.168.3.1, 00:00:08, FastEthernet1/3
C 192.168.3.0/24 is directly connected, FastEthernet1/3
------------------------------------
R5#sh ip route
……
3.0.0.0/24 is subnetted, 1 subnets
O E2 3.3.3.0 [110/200] via 192.168.5.1, 00:00:43, FastEthernet1/5
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
O E2 192.168.4.0/24 [110/20] via 192.168.5.1, 01:38:10, FastEthernet1/5
C 192.168.5.0/24 is directly connected, FastEthernet1/5
O E2 192.168.2.0/24 [110/20] via 192.168.5.1, 01:38:10, FastEthernet1/5
O E2 192.168.3.0/24 [110/20] via 192.168.5.1, 01:38:10, FastEthernet1/5
------------------------------------
6、EIGRP与OSPF重分发
R1(config)#router eigrp 100
R1(config-router)#redistribute ospf 1 metric 10000 100 255 1 1500
R1(config-router)#exit
R1(config)#router ospf 1
R1(config-router)#redistribute eigrp 100 metric 200 subnets
------------------------------------
注意,如前面所说,将路由向eigrp重分发时,带宽、延迟等五个参数一定要正确。将路由向ospf重分发时,后面要写subnets选项。
配置完成后,在R4、R5上可以看到彼此之间的路由了。
R4#sh ip route
……
2.0.0.0/24 is subnetted, 1 subnets
D EX 2.2.2.0 [170/30720] via 192.168.4.1, 01:51:06, FastEthernet1/4
3.0.0.0/24 is subnetted, 1 subnets
D EX 3.3.3.0 [170/284160] via 192.168.4.1, 00:20:39, FastEthernet1/4
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
5.0.0.0/32 is subnetted, 1 subnets
D EX 5.5.5.5 [170/284160] via 192.168.4.1, 00:03:03, FastEthernet1/4
C 192.168.4.0/24 is directly connected, FastEthernet1/4
D EX 192.168.5.0/24 [170/30720] via 192.168.4.1, 01:51:06, FastEthernet1/4
D EX 192.168.2.0/24 [170/30720] via 192.168.4.1, 01:51:06, FastEthernet1/4
D EX 192.168.3.0/24 [170/30720] via 192.168.4.1, 01:51:06, FastEthernet1/4
------------------------------------
R5#sh ip route
……
3.0.0.0/24 is subnetted, 1 subnets
O E2 3.3.3.0 [110/200] via 192.168.5.1, 00:07:21, FastEthernet1/5
4.0.0.0/24 is subnetted, 1 subnets
O E2 4.4.4.0 [110/200] via 192.168.5.1, 00:02:27, FastEthernet1/5
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Loopback0
O E2 192.168.4.0/24 [110/20] via 192.168.5.1, 01:50:19, FastEthernet1/5
C 192.168.5.0/24 is directly connected, FastEthernet1/5
O E2 192.168.2.0/24 [110/20] via 192.168.5.1, 01:50:19, FastEthernet1/5
O E2 192.168.3.0/24 [110/20] via 192.168.5.1, 01:50:19, FastEthernet1/5
------------------------------------
至此,整个网络实现互通。
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