OSPF虚链路配置：中转区域
2008-05-10 11:26
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OSPF采用由两层组成的分层结构，这要求所有的区域都与主干区域（区域0）直接相连。但是，当某个OSPF区域与OSPF主干区域（区域0）之间没有直接连接时，便会导致LSDB不一致以及该区域中的网络无法到达区域0。采用虚链路在该区域与主干区域之间建立起逻辑的连接，便可解决LSDB不一致以及该区域中的网络无法到达区域0的问题。
一、网络拓扑
[align=left] [/align]
[align=left]二、具体配置[/align]
[align=left] [/align]
[align=left]1、基本配置：[/align]
[align=left] [/align]
[align=left]RA：[/align]
[align=left]Router(config)#hostname RA
RA(config)#interface Loopback0
RA(config-if)#ip address 1.1.1.1 255.255.255.0
RA(config-if)#ip ospf network point-to-point
RA(config-if)#exit
RA(config)#interface Serial1/0
RA(config-if)#ip address 10.10.10.1 255.255.255.0
RA(config-if)#no shutdown
RA(config-if)#exit
RA(config)#router ospf 10
RA(config-router)#router-id 1.1.1.1
RA(config-router)#network 1.1.1.0 0.0.0.255 area 0
RA(config-router)#network 10.10.10.0 0.0.0.255 area 0
RA(config-router)#exit[/align]
[align=left] [/align]
[align=left]RB：[/align]
[align=left]Router(config)#hostname RB
RB(config)#interface Loopback0
RB(config-if)#ip address 2.2.2.2 255.255.255.0
RB(config-if)#ip ospf network point-to-point
RB(config-if)#exit
RB(config)#interface Serial1/0
RB(config-if)#ip address 10.10.10.2 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#interface Serial1/1
RB(config-if)#ip address 10.10.20.1 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#router ospf 20
RB(config-router)#router-id 2.2.2.2
RB(config-router)#network 2.2.2.0 0.0.0.255 area 1
RB(config-router)#network 10.10.20.0 0.0.0.255 area 1
RB(config-router)#network 10.10.10.0 0.0.0.255 area 0
RB(config-router)#exit[/align]
[align=left] [/align]
[align=left]RC：[/align]
[align=left]Router(config)#hostname RC
RC(config)#interface Loopback0
RC(config-if)#ip address 3.3.3.3 255.255.255.0
RC(config-if)#ip ospf network point-to-point
RC(config-if)#exit
RC(config)#interface Serial1/1
RC(config-if)#ip address 10.10.20.2 255.255.255.0
RC(config-if)#no shutdown
RC(config-if)#exit
RC(config)#router ospf 30
RC(config-router)#router-id 3.3.3.3
RC(config-router)#network 3.3.3.0 0.0.0.255 area 2
RC(config-router)#network 10.10.20.0 0.0.0.255 area 1
RC(config-router)#exit[/align]
[align=left] [/align]
[align=left]2、查看RA的路由表：[/align]
[align=left] [/align]
[align=left]RA#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, 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[/align]
[align=left]Gateway of last resort is not set[/align]
[align=left] 1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
O IA 2.2.2.0 [110/65] via 10.10.10.2, 00:00:07, Serial1/0
10.0.0.0/24 is subnetted, 2 subnets
C 10.10.10.0 is directly connected, Serial1/0
O IA 10.10.20.0 [110/128] via 10.10.10.2, 00:00:07, Serial1/0[/align]
[align=left] [/align]
[align=left]可见，RA路由表中没有通往网络3.0.0.0/24的路由。因为网络3.0.0.0/24所在的区域没有和主干区域直接连接，需要采用虚链路在area 0 和 area 3 之间建立一条逻辑链路。[/align]
[align=left] [/align]
[align=left]3、在区域边界路由器RB和RC上配置虚链路：[/align]
[align=left] [/align]
[align=left]RB(config)#router ospf 20
RB(config-router)#area 1 virtual-link 3.3.3.3
RB(config-router)#exit[/align]
[align=left] [/align]
[align=left]RC(config)#router ospf 30
RC(config-router)#area 1 virtual-link 2.2.2.2
RC(config-router)#exit[/align]
[align=left] [/align]
[align=left]三、验证配置[/align]
[align=left] [/align]
[align=left]1、查看RA的OSPF路由表：[/align]
[align=left] [/align]
[align=left]RA#show ip route ospf
2.0.0.0/24 is subnetted, 1 subnets
O IA 2.2.2.0 [110/65] via 10.10.10.2, 00:03:18, Serial1/0
3.0.0.0/24 is subnetted, 1 subnets
O IA 3.3.3.0 [110/129] via 10.10.10.2, 00:03:18, Serial1/0
10.0.0.0/24 is subnetted, 2 subnets
O IA 10.10.20.0 [110/128] via 10.10.10.2, 00:03:18, Serial1/0[/align]
[align=left] [/align]
[align=left]可见，RA已经学习到通往RC环回接口的路由。[/align]
[align=left] [/align]
[align=left]2、查看虚链路的运行状况：[/align]
[align=left] [/align]
[align=left]RB#show ip ospf virtual-link
Virtual Link OSPF_VL0 to router 3.3.3.3 is up ----通往router 3.3.3.3的虚链路已开通。
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Serial1/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT, ----点到点的连接。
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:01
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec[/align]
[align=left]
RC#show ip ospf virtual-link
Virtual Link OSPF_VL1 to router 2.2.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Serial1/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:09
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec[/align]
[align=left] [/align]
[align=left]3、查看OSPF数据库：[/align]
[align=left] [/align]
[align=left]RA#show ip ospf database[/align]
[align=left] OSPF Router with ID (1.1.1.1) (Process ID 10)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 684 0x80000009 0x00EA50 3
2.2.2.2 2.2.2.2 1110 0x80000006 0x00398C 3
3.3.3.3 3.3.3.3 2 (DNA) 0x80000001 0x00E6BF 1[/align]
[align=left] Summary Net Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
2.2.2.0 2.2.2.2 546 0x80000002 0x000D20
2.2.2.0 3.3.3.3 2 (DNA) 0x80000001 0x007376
3.3.3.0 3.3.3.3 2 (DNA) 0x80000001 0x00CC5A
10.10.20.0 2.2.2.2 1047 0x80000003 0x00F3D6
10.10.20.0 3.3.3.3 2 (DNA) 0x80000001 0x00D9EE[/align]
[align=left] [/align]
[align=left]RB#show ip ospf database[/align]
[align=left] OSPF Router with ID (2.2.2.2) (Process ID 20)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 161 0x80000009 0x00EA50 3
2.2.2.2 2.2.2.2 585 0x80000006 0x00398C 3
3.3.3.3 3.3.3.3 1 (DNA) 0x80000001 0x00E6BF 1[/align]
[align=left] Summary Net Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
2.2.2.0 2.2.2.2 20 0x80000002 0x000D20
2.2.2.0 3.3.3.3 1 (DNA) 0x80000001 0x007376
3.3.3.0 3.3.3.3 1 (DNA) 0x80000001 0x00CC5A
10.10.20.0 2.2.2.2 522 0x80000003 0x00F3D6
10.10.20.0 3.3.3.3 1 (DNA) 0x80000001 0x00D9EE[/align]
[align=left] Router Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 20 0x80000009 0x0052C4 3
3.3.3.3 3.3.3.3 429 0x80000008 0x00CF5A 2[/align]
[align=left] Summary Net Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
1.1.1.0 2.2.2.2 25 0x80000002 0x00B33C
1.1.1.0 3.3.3.3 583 0x80000001 0x001A92
3.3.3.0 3.3.3.3 593 0x80000001 0x00CC5A
10.10.10.0 2.2.2.2 1284 0x80000003 0x006272
10.10.10.0 3.3.3.3 583 0x80000001 0x00CAC7[/align]
[align=left] [/align]
[align=left]RC#show ip ospf database[/align]
[align=left] OSPF Router with ID (3.3.3.3) (Process ID 30)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1423 (DNA) 0x80000008 0x00EC4F 3
2.2.2.2 2.2.2.2 5 (DNA) 0x80000006 0x00398C 3
3.3.3.3 3.3.3.3 1183 0x80000001 0x00E6BF 1[/align]
[align=left] Summary Net Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
2.2.2.0 2.2.2.2 1294 (DNA) 0x80000001 0x000F1F
2.2.2.0 3.3.3.3 1183 0x80000001 0x007376
3.3.3.0 3.3.3.3 1183 0x80000001 0x00CC5A
10.10.20.0 2.2.2.2 1967 (DNA) 0x80000002 0x00F5D5
10.10.20.0 3.3.3.3 1183 0x80000001 0x00D9EE[/align]
[align=left] Router Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 619 0x80000009 0x0052C4 3
3.3.3.3 3.3.3.3 1025 0x80000008 0x00CF5A 2[/align]
[align=left] Summary Net Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
1.1.1.0 2.2.2.2 620 0x80000002 0x00B33C
1.1.1.0 3.3.3.3 1175 0x80000001 0x001A92
3.3.3.0 3.3.3.3 1186 0x80000001 0x00CC5A
10.10.10.0 2.2.2.2 1879 0x80000003 0x006272
10.10.10.0 3.3.3.3 1176 0x80000001 0x00CAC7[/align]
[align=left] Router Link States (Area 2)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
3.3.3.3 3.3.3.3 1186 0x80000005 0x0059B2 1[/align]
[align=left] Summary Net Link States (Area 2)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
1.1.1.0 3.3.3.3 1177 0x80000001 0x001A92
2.2.2.0 3.3.3.3 1188 0x80000001 0x007376
10.10.10.0 3.3.3.3 1178 0x80000001 0x00CAC7
10.10.20.0 3.3.3.3 1188 0x80000001 0x00D9EE[/align]
[align=left] [/align]
[align=left]数据库中的DNA即是DoNotAge。[/align]
[align=left]Link ID ：标志LSA。[/align]
[align=left]ADV Router ：通告LSA的路由器。[/align]
[align=left]Age ：最长寿命计数器，单位为秒。最长寿命为1小时（3600秒）。[/align]
[align=left]Seq# ：LSA的序列号。初始值为0x80000001，每当LSA被更新时都加1.[/align]
[align=left]Checksum ：LSA的校验和，确保LSA被可靠地接收。[/align]
[align=left]Link Count ：直接连接的链路总数，只用于路由器LSA中，链路计数包括所有的点到点链路、中转链路和末节链路。除点到点串行链路导致计数增加2外，其他所有串行都导致计数增加1，每条以太网链路也导致计数增加1.[/align]
[align=left] [/align]
[align=left]4、查看RB和RC到主干区域的逻辑连接状况：[/align]
[align=left] [/align]
[align=left]RB#show ip ospf database router 3.3.3.3[/align]
[align=left] OSPF Router with ID (2.2.2.2) (Process ID 20)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left] Adv Router is not-reachable
LS age: 1 (DoNotAge)
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE6BF
Length: 36
Area Border Router
Number of Links: 1[/align]
[align=left] Link connected to: a Virtual Link ----虚链路
(Link ID) Neighboring Router ID: 2.2.2.2
(Link Data) Router Interface address: 10.10.20.2
Number of TOS metrics: 0
TOS 0 Metrics: 64[/align]
[align=left]
RC#show ip ospf database router 2.2.2.2[/align]
[align=left] OSPF Router with ID (3.3.3.3) (Process ID 30)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left] Routing Bit Set on this LSA
LS age: 5 (DoNotAge)
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 2.2.2.2
Advertising Router: 2.2.2.2
LS Seq Number: 80000006
Checksum: 0x398C
Length: 60
Area Border Router
Number of Links: 3[/align]
[align=left] Link connected to: a Virtual Link ----虚链路
(Link ID) Neighboring Router ID: 3.3.3.3
(Link Data) Router Interface address: 10.10.20.1
Number of TOS metrics: 0
TOS 0 Metrics: 64[/align]
[align=left]
[/align]本文出自 “Uione” 博客，请务必保留此出处http://weiqijun.blog.51cto.com/338163/76293
一、网络拓扑
[align=left] [/align]
[align=left]二、具体配置[/align]
[align=left] [/align]
[align=left]1、基本配置：[/align]
[align=left] [/align]
[align=left]RA：[/align]
[align=left]Router(config)#hostname RA
RA(config)#interface Loopback0
RA(config-if)#ip address 1.1.1.1 255.255.255.0
RA(config-if)#ip ospf network point-to-point
RA(config-if)#exit
RA(config)#interface Serial1/0
RA(config-if)#ip address 10.10.10.1 255.255.255.0
RA(config-if)#no shutdown
RA(config-if)#exit
RA(config)#router ospf 10
RA(config-router)#router-id 1.1.1.1
RA(config-router)#network 1.1.1.0 0.0.0.255 area 0
RA(config-router)#network 10.10.10.0 0.0.0.255 area 0
RA(config-router)#exit[/align]
[align=left] [/align]
[align=left]RB：[/align]
[align=left]Router(config)#hostname RB
RB(config)#interface Loopback0
RB(config-if)#ip address 2.2.2.2 255.255.255.0
RB(config-if)#ip ospf network point-to-point
RB(config-if)#exit
RB(config)#interface Serial1/0
RB(config-if)#ip address 10.10.10.2 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#interface Serial1/1
RB(config-if)#ip address 10.10.20.1 255.255.255.0
RB(config-if)#no shutdown
RB(config-if)#exit
RB(config)#router ospf 20
RB(config-router)#router-id 2.2.2.2
RB(config-router)#network 2.2.2.0 0.0.0.255 area 1
RB(config-router)#network 10.10.20.0 0.0.0.255 area 1
RB(config-router)#network 10.10.10.0 0.0.0.255 area 0
RB(config-router)#exit[/align]
[align=left] [/align]
[align=left]RC：[/align]
[align=left]Router(config)#hostname RC
RC(config)#interface Loopback0
RC(config-if)#ip address 3.3.3.3 255.255.255.0
RC(config-if)#ip ospf network point-to-point
RC(config-if)#exit
RC(config)#interface Serial1/1
RC(config-if)#ip address 10.10.20.2 255.255.255.0
RC(config-if)#no shutdown
RC(config-if)#exit
RC(config)#router ospf 30
RC(config-router)#router-id 3.3.3.3
RC(config-router)#network 3.3.3.0 0.0.0.255 area 2
RC(config-router)#network 10.10.20.0 0.0.0.255 area 1
RC(config-router)#exit[/align]
[align=left] [/align]
[align=left]2、查看RA的路由表：[/align]
[align=left] [/align]
[align=left]RA#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, 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[/align]
[align=left]Gateway of last resort is not set[/align]
[align=left] 1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
O IA 2.2.2.0 [110/65] via 10.10.10.2, 00:00:07, Serial1/0
10.0.0.0/24 is subnetted, 2 subnets
C 10.10.10.0 is directly connected, Serial1/0
O IA 10.10.20.0 [110/128] via 10.10.10.2, 00:00:07, Serial1/0[/align]
[align=left] [/align]
[align=left]可见，RA路由表中没有通往网络3.0.0.0/24的路由。因为网络3.0.0.0/24所在的区域没有和主干区域直接连接，需要采用虚链路在area 0 和 area 3 之间建立一条逻辑链路。[/align]
[align=left] [/align]
[align=left]3、在区域边界路由器RB和RC上配置虚链路：[/align]
[align=left] [/align]
[align=left]RB(config)#router ospf 20
RB(config-router)#area 1 virtual-link 3.3.3.3
RB(config-router)#exit[/align]
[align=left] [/align]
[align=left]RC(config)#router ospf 30
RC(config-router)#area 1 virtual-link 2.2.2.2
RC(config-router)#exit[/align]
[align=left] [/align]
[align=left]三、验证配置[/align]
[align=left] [/align]
[align=left]1、查看RA的OSPF路由表：[/align]
[align=left] [/align]
[align=left]RA#show ip route ospf
2.0.0.0/24 is subnetted, 1 subnets
O IA 2.2.2.0 [110/65] via 10.10.10.2, 00:03:18, Serial1/0
3.0.0.0/24 is subnetted, 1 subnets
O IA 3.3.3.0 [110/129] via 10.10.10.2, 00:03:18, Serial1/0
10.0.0.0/24 is subnetted, 2 subnets
O IA 10.10.20.0 [110/128] via 10.10.10.2, 00:03:18, Serial1/0[/align]
[align=left] [/align]
[align=left]可见，RA已经学习到通往RC环回接口的路由。[/align]
[align=left] [/align]
[align=left]2、查看虚链路的运行状况：[/align]
[align=left] [/align]
[align=left]RB#show ip ospf virtual-link
Virtual Link OSPF_VL0 to router 3.3.3.3 is up ----通往router 3.3.3.3的虚链路已开通。
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Serial1/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT, ----点到点的连接。
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:01
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec[/align]
[align=left]
RC#show ip ospf virtual-link
Virtual Link OSPF_VL1 to router 2.2.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Serial1/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:09
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec[/align]
[align=left] [/align]
[align=left]3、查看OSPF数据库：[/align]
[align=left] [/align]
[align=left]RA#show ip ospf database[/align]
[align=left] OSPF Router with ID (1.1.1.1) (Process ID 10)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 684 0x80000009 0x00EA50 3
2.2.2.2 2.2.2.2 1110 0x80000006 0x00398C 3
3.3.3.3 3.3.3.3 2 (DNA) 0x80000001 0x00E6BF 1[/align]
[align=left] Summary Net Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
2.2.2.0 2.2.2.2 546 0x80000002 0x000D20
2.2.2.0 3.3.3.3 2 (DNA) 0x80000001 0x007376
3.3.3.0 3.3.3.3 2 (DNA) 0x80000001 0x00CC5A
10.10.20.0 2.2.2.2 1047 0x80000003 0x00F3D6
10.10.20.0 3.3.3.3 2 (DNA) 0x80000001 0x00D9EE[/align]
[align=left] [/align]
[align=left]RB#show ip ospf database[/align]
[align=left] OSPF Router with ID (2.2.2.2) (Process ID 20)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 161 0x80000009 0x00EA50 3
2.2.2.2 2.2.2.2 585 0x80000006 0x00398C 3
3.3.3.3 3.3.3.3 1 (DNA) 0x80000001 0x00E6BF 1[/align]
[align=left] Summary Net Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
2.2.2.0 2.2.2.2 20 0x80000002 0x000D20
2.2.2.0 3.3.3.3 1 (DNA) 0x80000001 0x007376
3.3.3.0 3.3.3.3 1 (DNA) 0x80000001 0x00CC5A
10.10.20.0 2.2.2.2 522 0x80000003 0x00F3D6
10.10.20.0 3.3.3.3 1 (DNA) 0x80000001 0x00D9EE[/align]
[align=left] Router Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 20 0x80000009 0x0052C4 3
3.3.3.3 3.3.3.3 429 0x80000008 0x00CF5A 2[/align]
[align=left] Summary Net Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
1.1.1.0 2.2.2.2 25 0x80000002 0x00B33C
1.1.1.0 3.3.3.3 583 0x80000001 0x001A92
3.3.3.0 3.3.3.3 593 0x80000001 0x00CC5A
10.10.10.0 2.2.2.2 1284 0x80000003 0x006272
10.10.10.0 3.3.3.3 583 0x80000001 0x00CAC7[/align]
[align=left] [/align]
[align=left]RC#show ip ospf database[/align]
[align=left] OSPF Router with ID (3.3.3.3) (Process ID 30)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1423 (DNA) 0x80000008 0x00EC4F 3
2.2.2.2 2.2.2.2 5 (DNA) 0x80000006 0x00398C 3
3.3.3.3 3.3.3.3 1183 0x80000001 0x00E6BF 1[/align]
[align=left] Summary Net Link States (Area 0)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
2.2.2.0 2.2.2.2 1294 (DNA) 0x80000001 0x000F1F
2.2.2.0 3.3.3.3 1183 0x80000001 0x007376
3.3.3.0 3.3.3.3 1183 0x80000001 0x00CC5A
10.10.20.0 2.2.2.2 1967 (DNA) 0x80000002 0x00F5D5
10.10.20.0 3.3.3.3 1183 0x80000001 0x00D9EE[/align]
[align=left] Router Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 619 0x80000009 0x0052C4 3
3.3.3.3 3.3.3.3 1025 0x80000008 0x00CF5A 2[/align]
[align=left] Summary Net Link States (Area 1)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
1.1.1.0 2.2.2.2 620 0x80000002 0x00B33C
1.1.1.0 3.3.3.3 1175 0x80000001 0x001A92
3.3.3.0 3.3.3.3 1186 0x80000001 0x00CC5A
10.10.10.0 2.2.2.2 1879 0x80000003 0x006272
10.10.10.0 3.3.3.3 1176 0x80000001 0x00CAC7[/align]
[align=left] Router Link States (Area 2)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum Link count
3.3.3.3 3.3.3.3 1186 0x80000005 0x0059B2 1[/align]
[align=left] Summary Net Link States (Area 2)[/align]
[align=left]Link ID ADV Router Age Seq# Checksum
1.1.1.0 3.3.3.3 1177 0x80000001 0x001A92
2.2.2.0 3.3.3.3 1188 0x80000001 0x007376
10.10.10.0 3.3.3.3 1178 0x80000001 0x00CAC7
10.10.20.0 3.3.3.3 1188 0x80000001 0x00D9EE[/align]
[align=left] [/align]
[align=left]数据库中的DNA即是DoNotAge。[/align]
[align=left]Link ID ：标志LSA。[/align]
[align=left]ADV Router ：通告LSA的路由器。[/align]
[align=left]Age ：最长寿命计数器，单位为秒。最长寿命为1小时（3600秒）。[/align]
[align=left]Seq# ：LSA的序列号。初始值为0x80000001，每当LSA被更新时都加1.[/align]
[align=left]Checksum ：LSA的校验和，确保LSA被可靠地接收。[/align]
[align=left]Link Count ：直接连接的链路总数，只用于路由器LSA中，链路计数包括所有的点到点链路、中转链路和末节链路。除点到点串行链路导致计数增加2外，其他所有串行都导致计数增加1，每条以太网链路也导致计数增加1.[/align]
[align=left] [/align]
[align=left]4、查看RB和RC到主干区域的逻辑连接状况：[/align]
[align=left] [/align]
[align=left]RB#show ip ospf database router 3.3.3.3[/align]
[align=left] OSPF Router with ID (2.2.2.2) (Process ID 20)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left] Adv Router is not-reachable
LS age: 1 (DoNotAge)
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 3.3.3.3
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0xE6BF
Length: 36
Area Border Router
Number of Links: 1[/align]
[align=left] Link connected to: a Virtual Link ----虚链路
(Link ID) Neighboring Router ID: 2.2.2.2
(Link Data) Router Interface address: 10.10.20.2
Number of TOS metrics: 0
TOS 0 Metrics: 64[/align]
[align=left]
RC#show ip ospf database router 2.2.2.2[/align]
[align=left] OSPF Router with ID (3.3.3.3) (Process ID 30)[/align]
[align=left] Router Link States (Area 0)[/align]
[align=left] Routing Bit Set on this LSA
LS age: 5 (DoNotAge)
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 2.2.2.2
Advertising Router: 2.2.2.2
LS Seq Number: 80000006
Checksum: 0x398C
Length: 60
Area Border Router
Number of Links: 3[/align]
[align=left] Link connected to: a Virtual Link ----虚链路
(Link ID) Neighboring Router ID: 3.3.3.3
(Link Data) Router Interface address: 10.10.20.1
Number of TOS metrics: 0
TOS 0 Metrics: 64[/align]
[align=left]
[/align]本文出自 “Uione” 博客，请务必保留此出处http://weiqijun.blog.51cto.com/338163/76293
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