OSPF LSA 实验1、配置完r1后查看database表，发现只有第一类的r1#sh ip os dOSPF Router with ID (1.1.1.1) (Process ID 1)Router Link States (Area 0)Link ID ADV Router Age Seq# Checksum Link count1.1.1.1 1.1.1.1 10 0x800000010x00242B 22、如果你想查看一下明细，可以用下面这个命令：r1#sh ip os d routerOSPF Router with ID (1.1.1.1) (Process ID 1) Router Link States (Area 0)LS age: 49Options: (No TOS-capability, DC)LS Type: Router Links //一类LSALink State ID: 1.1.1.1Advertising Router: 1.1.1.1LS Seq Number: 80000001Checksum: 0x242BLength: 48Number of Links: 2Link connected to: a Stub Network(Link ID) Network/subnet number: 13.13.13.0(Link Data) Network Mask: 255.255.255.0Number of TOS metrics: 0TOS 0 Metrics: 64Link connected to: a Stub Network(Link ID) Network/subnet number: 12.12.12.0(Link Data) Network Mask: 255.255.255.0Number of TOS metrics: 0TOS 0 Metrics: 643、配置完r2后查看邻居表如下：发现state 是但是没有DR.BDR的选举，因为这不是一个MA的网络r2#*Dec 20 17:37:42.731: %SYS-5-CONFIG_I: Configured from consoleby consoler2#sh ip os neiNeighbor ID Pri State Dead Time Address Interface1.1.1.1 0 FULL/ - 00:00:3512.12.12.1 Serial1/04、配置完区域零后在看邻居表发现有DR 的选举，，这是因为存在MA 的网络r2#sh ip os neiNeighbor ID Pri State Dead Time AddressInterface3.3.3.3 1 FULL/DR 00:00:39 23.23.23.3 FastEthernet2/01.1.1.1 0 FULL/ - 00:00:39 12.12.12.1 Serial1/05、再看database 表发现两种类型的lsa ，后者是由dr通告的这是因为r2#sh ip os dOSPF Router with ID (2.2.2.2) (Process ID 1)Router Link States (Area 0)Link ID ADV Router Age Seq# Checksum Link count1.1.1.1 1.1.1.1 210 0x800000070x00D278 42.2.2.2 2.2.2.2 171 0x800000060x003A67 33.3.3.3 3.3.3.3 172 0x800000020x00C6CE 3Net Link States (Area 0)Link ID ADV Router Age Seq# Checksum23.23.23.3 3.3.3.3 172 0x800000010x00B21F6、起下面的区域了查看数据库表r2#r2#sh ip os dOSPF Router with ID (2.2.2.2) (Process ID 1)Router Link States (Area 0)Link ID ADV Router Age Seq# Checksum Link count1.1.1.1 1.1.1.1 837 0x800000070x00D278 42.2.2.2 2.2.2.2 108 0x800000070x003B64 33.3.3.3 3.3.3.3 799 0x800000020x00C6CE 3Net Link States (Area 0)Link ID ADV Router Age Seq# Checksum23.23.23.3 3.3.3.3 799 0x800000010x00B21FSummary Net Link States (Area 0)Link ID ADV Router Age Seq# Checksum24.24.24.0 2.2.2.2 104 0x800000010x006C40Router Link States (Area 24)Link ID ADV Router Age Seq# Checksum Link count2.2.2.2 2.2.2.2 68 0x800000020x005C93 24.4.4.4 4.4.4.4 65 0x800000020x00984E 2Summary Net Link States (Area 24)Link ID ADV Router Age Seq# Checksum12.12.12.0 2.2.2.2 110 0x800000010x001EB213.13.13.0 2.2.2.2 111 0x800000010x0004C823.23.23.0 2.2.2.2 112 0x800000010x0018D6出现了三类LSA，这是因为有ABR,SUMMARY是ABR告诉各路由器的。

7.差看一下路由表，发现出现了O IA的路由条目。

r4#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF interareaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA externaltype 2E1 - 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-2ia - IS-IS inter area, * - candidate default, U - per-user static routeo - ODR, P - periodic downloaded static route Gateway of last resort is not set35.0.0.0/24 is subnetted, 1 subnetsO IA 35.35.35.0 [110/129] via 24.24.24.2, 00:02:57, Serial1/04.0.0.0/24 is subnetted, 1 subnetsC 4.4.4.0 is directly connected, Loopback023.0.0.0/24 is subnetted, 1 subnetsO IA 23.23.23.0 [110/65] via 24.24.24.2, 00:08:44, Serial1/024.0.0.0/24 is subnetted, 1 subnetsC 24.24.24.0 is directly connected, Serial1/012.0.0.0/24 is subnetted, 1 subnetsO IA 12.12.12.0 [110/128] via 24.24.24.2, 00:08:44,Serial1/013.0.0.0/24 is subnetted, 1 subnetsO IA 13.13.13.0 [110/129] via 24.24.24.2, 00:08:44,Serial1/08.我们在r4上重发布直连，就会出现五类的LSA了。

r4#sh ip os dOSPF Router with ID (4.4.4.4) (Process ID 1)Router Link States (Area 24)Link ID ADV Router Age Seq# Checksum Link count2.2.2.2 2.2.2.2 799 0x800000020x005C93 24.4.4.4 4.4.4.4 7 0x800000030x009C47 2Summary Net Link States (Area 24)Link ID ADV Router Age Seq#Checksum12.12.12.0 2.2.2.2 839 0x800000010x001EB213.13.13.0 2.2.2.2 839 0x800000010x0004C823.23.23.0 2.2.2.2 839 0x800000010x0018D635.35.35.0 2.2.2.2 438 0x800000010x00E8A1Type-5 AS External Link StatesLink ID ADV Router Age Seq# Checksum Tag4.4.4.0 4.4.4.4 6 0x800000010x00DEA5 0五类的LSA能够穿越ABR,并且此时出现四类LSA，因为有ASBR.想要查看是否是ASBR ,可以用命令 sh ip os database routeLS age: 491Options: (No TOS-capability, DC)LS Type: Router LinksLink State ID: 4.4.4.4Advertising Router: 4.4.4.4LS Seq Number: 80000003Checksum: 0x9C47Length: 48AS Boundary Router //ASBRNumber of Links: 210、此时在查看一下路由表。