一个拓扑全搞定 -- 一个拓扑搞定 ospf的5种LSA类型
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1.1. OSPF五种LSA类型
1.1.1.实验目的
查看所有路由器的数据库和路由表，深入了解OSPF的LSA类型和OSPF路由条目
实验拓扑
1.1.2.实验配置
R1#show run
router ospf 1
log-adjacency-changes
redistribute rip subnets （redistribute rip metric-type 2 subnets）
network 16.16.16.0 0.0.0.255 area 16
!
router rip
network 10.0.0.0
R2#show run
router ospf 1
log-adjacency-changes
network 23.23.23.0 0.0.0.255 area 23
network 26.26.26.0 0.0.0.255 area 0
R3#show run
router ospf 1
log-adjacency-changes
network 3.3.3.3 0.0.0.0 area 23
network 23.23.23.0 0.0.0.255 area 23
R6#show run
router ospf 1
log-adjacency-changes
network 16.16.16.0 0.0.0.255 area 16
network 26.26.26.0 0.0.0.255 area 0
1.1.3.实验验证
R1#show ip route
Gateway of last resort is not set
16.0.0.0/24 is subnetted, 1 subnets
C 16.16.16.0is directly connected, Ethernet0
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3[110/944] via 16.16.16.6, 00:38:18, Ethernet0
23.0.0.0/24 is subnetted, 1 subnets
O IA 23.23.23.0[110/943] via 16.16.16.6, 00:38:18, Ethernet0
10.0.0.0/24 is subnetted, 1 subnets
C 10.0.0.0is directly connected, Loopback0
26.0.0.0/24 is subnetted, 1 subnets
O IA 26.26.26.0 [110/879] via 16.16.16.6, 00:38:18, Ethernet0 ----在OSPF自治系统内的域间路由通告
R6#show ip route
3.0.0.0/32 is subnetted, 1 subnets
O IA 3.3.3.3[110/934] via 26.26.26.2, 00:43:58, Serial2
23.0.0.0/24 is subnetted, 1 subnets
O IA 23.23.23.0[110/933] via 26.26.26.2, 00:43:58, Serial2
10.0.0.0/24 is subnetted, 1 subnets
O E2 10.0.0.0[110/20] via 16.16.16.1, 00:29:57, Ethernet0 ----OSPF自治系统外
的路由通告
R6#show ip ospf database
OSPF Router with ID (6.6.6.6) (ProcessID 1)
Router Link States (Area 0)
1
Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 939 0x80000006 0x00597E 2
6.6.6.6 6.6.6.6 1752 0x80000008 0x00551C 2
-----type 1 LSAs 描述域内直连路由器的状态，只在域内泛洪
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.3 2.2.2.2 157 0x80000004 0x00499B
16.16.16.0 6.6.6.6 229 0x80000009 0x00E6FB
23.23.23.0 2.2.2.2 940 0x80000004 0x008A22
Summary ASB Link States (Area 0)
4
Link ID ADV Router Age Seq# Checksum
10.0.0.1 6.6.6.6 2006 0x80000002 0x009C71
-----type 4 LSA 伴随着5类LSA产生，用于将ASBR通告到自治系统内的其他区域，一旦产生，作用类似于3类LSA
Router Link States (Area 16)
Link ID ADV Router Age Seq# Checksum Link count
6.6.6.6 6.6.6.6 229 0x8000000D 0x00047C 1
10.0.0.1 10.0.0.1 16 0x80000005 0x00ADF8 1
Net Link States (Area 16)
2
Link ID ADV Router Age Seq# Checksum
16.16.16.6 6.6.6.6 231 0x80000003 0x00B115
-----type 2 LSA 由广播或非广播网络内的DR产生，仅在域内泛洪
Summary Net Link States (Area 16)
3
Link ID ADV Router Age Seq# Checksum
3.3.3.3 6.6.6.6 1753 0x80000003 0x00E389
23.23.23.0 6.6.6.6 1753 0x80000003 0x002510
26.26.26.0 6.6.6.6 1754 0x80000003 0x003636
-----type 3 LSA 转发域间路由，由后续的ABR再生成，只可在自治系统内转发
Type-5 AS External Link States
5
Link ID ADV Router Age Seq# Checksum Tag
10.0.0.0 10.0.0.1 1021 0x80000002 0x000387 0
-----type 5 LSA（External LSA）由ASBR产生，用于直接在整个OSPF自治系统内转发外部路由
R1#show ip ospf database
OSPF Router with ID (10.0.0.1)(Process ID 1)
Router Link States (Area 16)
Link ID ADV Router Age Seq# Checksum Link count
6.6.6.6 6.6.6.6 1198 0x8000000C 0x00067B 1
10.0.0.1 10.0.0.1 979 0x80000004 0x00AFF7 1
Net Link States (Area 16)
Link ID ADV Router Age Seq# Checksum
16.16.16.6 6.6.6.6 1198 0x80000002 0x00B314
Summary Net Link States (Area 16)
Link ID ADV Router Age Seq# Checksum
3.3.3.3 6.6.6.6 705 0x80000003 0x00E389
23.23.23.0 6.6.6.6 705 0x80000003 0x002510
26.26.26.0 6.6.6.6 705 0x80000003 0x003636
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
10.0.0.0 10.0.0.1 2015 0x80000001 0x000586 0
注：
R1 database 中有type 1、2、3、5 LSA | 在R6数据库中有Type 1、2、3、4、5 LSA |
R2数据库中有Type 1、3、4、5 LSA | 在R3数据库中有Type 1、3、4、5 LSA |
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