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	CCNP知识:使用分发列表控制路由重分发的方法
这次讲的CCNP知识要点是使用分发列表控制路由重分发的方法,其它的知识将会在后续的文章了给大家逐渐的介绍。
拓扑图是利用route-map控制重分发的那个实验一样的,这里不需要r4路由器大家可以把它忽略掉。
上一篇我讲过控制路由重分发有两种工具,route-map和分发列表。route-map已经讲过,这一个实验就是利用分发列表来控制路由重分发的。
废话不多说了,先讲讲拓扑结构。3台路由器,其中r1上运行ripv2,在r1上有4个环回接口。r2为asbr路由器,分别运行着ripv2和ospf,r3也为ospf。
- r1:
 - in e1/1
 - ip add 192.168.1.2 255.255.255.0
 - no sh
 - in e1/0
 - ip add 192.168.2.1 255.255.255.0
 - no sh
 - in loop 1
 - ip add 172.16.0.1 255.255.255.0
 - in loop 2
 - ip add 172.16.1.1 255.255.255.0
 - in loop 3
 - ip add 172.16.2.1 255.255.255.0
 - in loop 4
 - ip add 172.16.3.1 255.255.255.0
 - router rip
 - version 2
 - no au
 - net 192.168.1.0
 - net 192.168.2.0
 - net 172.16.0.0
 - r2:
 - in e1/1
 - ip add 192.168.2.2 255.255.255.0
 - no sh
 - in e1/0
 - ip add 192.168.3.1 255.255.255.0
 - no sh
 - router rip
 - version 2
 - net 192.168.2.0
 - redistribute ospf 1 metric 2 重分发ospf路由到rip
 - router ospf 1
 - net 192.168.3.1 0.0.0.0 a 0
 - redistribute rip metric-type 1 subnets
 - distribute-list 1 out rip 这条命令分发列表应用access-list 1
 - access-list 1 permit 172.16.1.0 0.0.0.255
 - access-list 1 permit 172.16.2.0 0.0.0.255 这3条acl控制匹配哪些路由条目,允许的将会被重分发
 - access-list 1 permit 192.168.1.0 0.0.0.255
 - r3:
 - in e1/1
 - ip add 192.168.3.2 255.255.255.0
 - no sh
 - ip ospf 1 a 0
 
看看效果,在r3上我们只重分发了匹配acl1的3条路由条目,而且把分发类型改为了1类,而默认是2类。
- R3#show ip rou
 - 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, 2 subnets
 - O E1 172.16.1.0 [110/30] via 192.168.3.1, 00:32:06, Ethernet1/1
 - O E1 172.16.2.0 [110/30] via 192.168.3.1, 00:32:06, Ethernet1/1
 - O E1 192.168.1.0/24 [110/30] via 192.168.3.1, 00:32:06, Ethernet1/1
 - C 192.168.3.0/24 is directly connected, Ethernet1/1
 
而这个是没有应用分发列表前的路由条目
- r3#show ip rou
 - 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, 4 subnets
 - O E1 172.16.0.0 [110/30] via 192.168.3.1, 00:00:15, Ethernet1/1
 - O E1 172.16.1.0 [110/30] via 192.168.3.1, 00:01:20, Ethernet1/1
 - O E1 172.16.2.0 [110/30] via 192.168.3.1, 00:01:20, Ethernet1/1
 - O E1 172.16.3.0 [110/30] via 192.168.3.1, 00:00:14, Ethernet1/1
 - O E1 192.168.1.0/24 [110/30] via 192.168.3.1, 00:01:20, Ethernet1/1
 - O E1 192.168.2.0/24 [110/30] via 192.168.3.1, 00:00:14, Ethernet1/1
 - C 192.168.3.0/24 is directly connected, Ethernet1/1
 
而分别ping也验证了确实达到了控制重分发条目的目的
- R3#ping 192.168.1.2
 - Type escape sequence to abort.
 - Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
 - !!!!!
 - Success rate is 100 percent (5/5), round-trip min/avg/max = 12/57/100 ms
 - R3#ping 172.16.3.1
 - Type escape sequence to abort.
 - Sending 5, 100-byte ICMP Echos to 172.16.3.1, timeout is 2 seconds:
 - .....
 - Success rate is 0 percent (0/5)
 - R3#ping 172.16.1.1
 - Type escape sequence to abort.
 - Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:
 - !!!!!
 - Success rate is 100 percent (5/5), round-trip min/avg/max = 16/45/88 ms
 
要通过CCNP(思科认证网络高级工程师)的认证并非易事,除了要熟悉理论知识之外也要加强自己的动手能力,做到融会贯通才行。

这个网站好啊,前几天刚被这个问题难倒了。
厉害!对网络的知识懂得很少。。
看着这个图和配置真的很熟悉,想当年读书时代就是玩这个的,可惜毕业后没有从事相关行业,现在已经全部还给老师了