23、OSPF配置实验之特殊区域Totally NSSA
2015-12-01 14:36
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1、特殊区域Totally NSSA解析
2、实验拓扑
Totally NSSA过滤的是远端R1的LSA3、LSA4、LSA5,本端R4的LSA4、LSA5会被转为LSA7,由于LSA7只能存在于NSSA中,其在区域边界路由器R3上将LSA7重新转为LSA5,R2下放的默认路由为3类路由。
3、实验配置
R1配置interface Loopback0 ip address 1.1.1.1 255.255.255.0interface Loopback10 ip address 10.10.10.10 255.255.255.0 interface Serial0/0 ip address 12.1.1.1 255.255.255.0 serial restart-delay 0router eigrp 90 network 10.10.10.0 0.0.0.255 no auto-summaryrouter ospf 110 router-id 1.1.1.1 redistribute eigrp 90 subnets network 12.1.1.0 0.0.0.255 area 2
R2配置interface Loopback0 ip address 2.2.2.2 255.255.255.0interface Serial0/0 ip address 12.1.1.2 255.255.255.0interface Serial0/1 ip address 23.1.1.2 255.255.255.0router ospf 110 router-id 2.2.2.2 log-adjacency-changes network 12.1.1.0 0.0.0.255 area 2 network 23.1.1.0 0.0.0.255 area 0
R3配置interface Loopback0 ip address 3.3.3.3 255.255.255.0interface Serial0/0 ip address 34.1.1.3 255.255.255.0interface Serial0/1 ip address 23.1.1.3 255.255.255.0router ospf 110 router-id 3.3.3.3 network 23.1.1.0 0.0.0.255 area 0 network 34.1.1.0 0.0.0.255 area 1
R4配置interface Loopback0 ip address 4.4.4.4 255.255.255.0interface Serial0/0 ip address 34.1.1.4 255.255.255.0interface Serial0/1 ip address 45.1.1.4 255.255.255.0router ospf 110 router-id 4.4.4.4 redistribute rip subnets network 34.1.1.0 0.0.0.255 area 1router rip version 2 network 45.0.0.0 no auto-summary
R5配置interface Loopback0 ip address 5.5.5.5 255.255.255.0interface Serial0/1 ip address 45.1.1.5 255.255.255.0router rip version 2 network 5.0.0.0 network 45.0.0.0 no auto-summary
4、实验验证
过滤远端LSA3、LSA4、LSA5,本端LSA4、LSA5转为LSA7
配置Totally NSSA前
配置Totally NSSA后
ABR下放3类默认路由
本文出自 “开源殿堂” 博客,请务必保留此出处http://kaiyuandiantang.blog.51cto.com/10699754/1718497
区域类型 | 作用 | 默认路由 | 备注 | 命令 |
stub | 过滤LSA4、LSA5 | ABR默认下发3类默认路由,seed cost值为1 | 本区域所有路由器都必须配置成stub,否则邻居起不来,且不能包含ASBR | area 2 stub area 2 default-cost x |
totally stub | 过滤LSA3、LSA4、LSA5 | ABR默认下发3类默认路由,seed cost值为1 | 本区域所有路由器都必须配置成stub,否则邻居起不来,且不能包含ASBR,ABR配置成totally stb | area 2 stub no-summary |
NSSA | 过滤远端LSA4、LSA5,本端LSA4、LSA5转为LSA7 | 不下发默认路由,需要在ABR上下放7类默认路由 | 本区域所有路由器都必须配置成nssa,否则邻居起不来,包含ASBR | area 2 nssa area 2 nssa default-information orig |
Totally NSSA | 过滤远端LSA3、LSA4、LSA5,本端LSA4、LSA5转为LSA7 | ABR下放3类默认路由 | 本区域所有路由器都必须配置成nssa,否则邻居起不来,包含ASBR,ABR配置成Totally NSSA | area 2 nssa no-summary |
Totally NSSA过滤的是远端R1的LSA3、LSA4、LSA5,本端R4的LSA4、LSA5会被转为LSA7,由于LSA7只能存在于NSSA中,其在区域边界路由器R3上将LSA7重新转为LSA5,R2下放的默认路由为3类路由。
3、实验配置
R1配置interface Loopback0 ip address 1.1.1.1 255.255.255.0interface Loopback10 ip address 10.10.10.10 255.255.255.0 interface Serial0/0 ip address 12.1.1.1 255.255.255.0 serial restart-delay 0router eigrp 90 network 10.10.10.0 0.0.0.255 no auto-summaryrouter ospf 110 router-id 1.1.1.1 redistribute eigrp 90 subnets network 12.1.1.0 0.0.0.255 area 2
R2配置interface Loopback0 ip address 2.2.2.2 255.255.255.0interface Serial0/0 ip address 12.1.1.2 255.255.255.0interface Serial0/1 ip address 23.1.1.2 255.255.255.0router ospf 110 router-id 2.2.2.2 log-adjacency-changes network 12.1.1.0 0.0.0.255 area 2 network 23.1.1.0 0.0.0.255 area 0
R3配置interface Loopback0 ip address 3.3.3.3 255.255.255.0interface Serial0/0 ip address 34.1.1.3 255.255.255.0interface Serial0/1 ip address 23.1.1.3 255.255.255.0router ospf 110 router-id 3.3.3.3 network 23.1.1.0 0.0.0.255 area 0 network 34.1.1.0 0.0.0.255 area 1
R4配置interface Loopback0 ip address 4.4.4.4 255.255.255.0interface Serial0/0 ip address 34.1.1.4 255.255.255.0interface Serial0/1 ip address 45.1.1.4 255.255.255.0router ospf 110 router-id 4.4.4.4 redistribute rip subnets network 34.1.1.0 0.0.0.255 area 1router rip version 2 network 45.0.0.0 no auto-summary
R5配置interface Loopback0 ip address 5.5.5.5 255.255.255.0interface Serial0/1 ip address 45.1.1.5 255.255.255.0router rip version 2 network 5.0.0.0 network 45.0.0.0 no auto-summary
4、实验验证
过滤远端LSA3、LSA4、LSA5,本端LSA4、LSA5转为LSA7
配置Totally NSSA前
配置Totally NSSA后
ABR下放3类默认路由
本文出自 “开源殿堂” 博客,请务必保留此出处http://kaiyuandiantang.blog.51cto.com/10699754/1718497
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