您的位置:首页 > 其它

OSPF特殊区域之NSSA和totally NSSA配置(二)

2011-01-21 19:55 671 查看
16.把R4上的Area 1配置成NSSA区域

R4(config)#router ospf 1

R4(config-router)#area 1 nssa default-information-originate //default-information-originate的参数目的是向area 1区域注入一条默认路由。
R4(config-router)#end
17.把R2和R3配置成NSSA区域

R2(config)#router ospf 1

R2(config-router)#area 1 nssa
R2(config-router)#end
R3(config)#router ospf 1
R3(config-router)#area 1 nssa
R3(config-router)#end
18.查看R3的路由表和链路状态数据库

R3#show ip ospf da

OSPF Router with ID (172.16.255.5) (Process ID 1)

Router Link States (Area 1) //LSA 1[/b]

Link ID ADV Router Age Seq# Checksum Link count
172.16.255.1 172.16.255.1 67 0x80000005 0x002BB8 2
172.16.255.5 172.16.255.5 63 0x80000006 0x0015E6 4
172.16.255.9 172.16.255.9 71 0x80000003 0x00507B 2

Summary Net Link States (Area 1) //LSA 2[/b]

Link ID ADV Router Age Seq# Checksum
172.16.255.8 172.16.255.9 212 0x80000002 0x00FE6F

Type-7 AS External Link States (Area 1) //LSA 7[/b]

Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 172.16.255.9 212 0x80000001 0x00C464 0
131.131.1.0 172.16.255.1 87 0x80000001 0x00213D 0
131.131.2.0 172.16.255.1 87 0x80000001 0x001647 0
R3#show 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 172.16.255.6 to network 0.0.0.0

172.16.0.0/30 is subnetted, 3 subnets
C 172.16.255.0 is directly connected, Serial0/1
C 172.16.255.4 is directly connected, Serial0/2
O IA 172.16.255.8 [110/128] via 172.16.255.6, 00:01:23, Serial0/2
131.131.0.0/24 is subnetted, 2 subnets
O N2 131.131.1.0 [110/200] via 172.16.255.1, 00:01:23, Serial0/1
O N2 131.131.2.0 [110/200] via 172.16.255.1, 00:01:23, Serial0/1
O*N2 0.0.0.0/0 [110/1] via 172.16.255.6, 00:01:23, Serial0/2 //到达R5所连接的网络,由默认路由替代。
19.测试连通性

R1#ping 192.168.2.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/89/172 ms
20.为了进一步简化area 1区域的路由器的路由表,我们采用完全次末节区域(Totally NSSA)特性来配置area 1。

21.在NSSA的基础上配置Totally NSSA区域特性,只需要在R4的路由器上作如下配置:

R4(config)#router ospf 1

R4(config-router)#area 1 nssa no-summary //no-summary[/b]参数指出:不要向区域1[/b]发送类型3[/b]的区域间汇总路由。[/b]
R4(config-router)#end
22.再次查看R3的链路状态数据库和路由表

R3#show ip ospf da

OSPF Router with ID (172.16.255.5) (Process ID 1)

Router Link States (Area 1) //1型LSA

Link ID ADV Router Age Seq# Checksum Link count
172.16.255.1 172.16.255.1 588 0x80000005 0x002BB8 2
172.16.255.5 172.16.255.5 584 0x80000006 0x0015E6 4
172.16.255.9 172.16.255.9 592 0x80000003 0x00507B 2

Summary Net Link States (Area 1) //3型LSA

Link ID ADV Router Age Seq# Checksum
0.0.0.0 172.16.255.9 113 0x80000001 0x0070FF

Type-7 AS External Link States (Area 1) //7型LSA

Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 172.16.255.9 733 0x80000001 0x00C464 0
131.131.1.0 172.16.255.1 607 0x80000001 0x00213D 0
131.131.2.0 172.16.255.1 607 0x80000001 0x001647 0
R3#show 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 172.16.255.6 to network 0.0.0.0

172.16.0.0/30 is subnetted, 2 subnets
C 172.16.255.0 is directly connected, Serial0/1
C 172.16.255.4 is directly connected, Serial0/2
131.131.0.0/24 is subnetted, 2 subnets
O N2 131.131.1.0 [110/200] via 172.16.255.1, 00:09:54, Serial0/1
O N2 131.131.2.0 [110/200] via 172.16.255.1, 00:09:54, Serial0/1
O*IA 0.0.0.0/0 [110/65] via 172.16.255.6, 00:02:07, Serial0/2 //到达其它OSPF区域和非R2路由器通告的外网路由均被此条默认替代。
23.测试连通性

R1#ping 192.168.2.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/85/128 ms
24.到R5上看是否将7型LSA转换成5型LSA

R5#show ip ospf da

OSPF Router with ID (192.168.1.1) (Process ID 1)

Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
172.16.255.9 172.16.255.9 1207 0x80000003 0x005FC1 2
192.168.1.1 192.168.1.1 1886 0x80000002 0x002B51 2

Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum
172.16.255.0 172.16.255.9 1061 0x80000001 0x002E0F
172.16.255.4 172.16.255.9 2000 0x80000001 0x0083F5

Type-5 AS External Link States //5型LSA

Link ID ADV Router Age Seq# Checksum Tag
131.131.1.0 172.16.255.9 1050 0x80000001 0x0085DA 0
131.131.2.0 172.16.255.9 1050 0x80000001 0x007AE4 0
192.168.1.0 192.168.1.1 1885 0x80000001 0x0021F4 0
192.168.2.0 192.168.1.1 1885 0x80000001 0x0016FE 0
本文出自 “等待” 博客,请务必保留此出处http://mxn19871215.blog.51cto.com/982365/483018
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: