HC120111002-OSPF協(xié)議報(bào)文和鏈路狀態(tài)通告

1、Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. OSPF協(xié)議報(bào)文和鏈路狀態(tài)通告Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page1前 言本課程介紹OSPF協(xié)議報(bào)文和鏈路狀態(tài)通告。課程內(nèi)容包括協(xié)議報(bào)文頭，報(bào)文類型，LSA類型等。Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page2培訓(xùn)目標(biāo)學(xué)完本課程后，您應(yīng)該能：l理解OSPF報(bào)文頭和報(bào)文

2、類型l理解鏈路狀態(tài)通告類型Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page3使用IP承載OSPF報(bào)文Link Layer HeaderIP Packet HeaderOSPF Protocol PacketFrameChecksumIP協(xié)議號(hào)為89OSPF Protocol HeaderOSPF Packet TypesCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page4OSPF報(bào)文頭部Version #TypeP

3、acket LengthRouter IDArea IDChecksumAuTypeAuthenticationAuthentication81632BitsCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page5驗(yàn)證合法OSPF報(bào)文頭部Version #TypePacket LengthRouter IDArea IDChecksumAuTypeAuthenticationAuthentication81632BitsCopyright 2009 Huawei Technologies Co., Ltd.

4、All rights reserved. Page6配置OSPF驗(yàn)證Loopback01.1.1.1/32RTARTBLoopback02.2.2.2/32E0/0E0/010.1.1.1/30.2 Area 1配置純文本密碼huaweiRTArouter id 1.1.1.1RTAospf RTA-ospf-1area 1RTA-ospf-1-area-0.0.0.1network 1.1.1.1 0.0.0.0RTA-ospf-1-area-0.0.0.1network 10.1.1.0 0.0.0.3RTAinterface Ethernet 0/0RTA-Ethernet0/0ospf

5、 authentication-mode simple plain huawei RTA-Ethernet0/0quitRTA.1Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page7配置OSPF驗(yàn)證Loopback01.1.1.1/32RTARTBLoopback02.2.2.2/32E0/0E0/010.1.1.1/30.2 Area 1配置純文本密碼huaweiRTBrouter id 2.2.2.2RTBospf RTB-ospf-1area 1RTB-ospf-1-area-0.0.0.1netw

6、ork 2.2.2.2 0.0.0.0RTB-ospf-1-area-0.0.0.1network 10.1.1.0 0.0.0.3RTBinterface Ethernet 0/0RTB-Ethernet0/0ospf authentication-mode simple plain huawei RTB-Ethernet0/0quitRTB.1Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page8OSPF報(bào)文類型Type報(bào)文名稱報(bào)文名稱報(bào)文功能報(bào)文功能1Hello發(fā)現(xiàn)和維護(hù)鄰居關(guān)系2Database D

7、escription發(fā)送鏈路狀態(tài)數(shù)據(jù)庫摘要3Link State Request請(qǐng)求特定的鏈路狀態(tài)信息4Link State Update發(fā)送詳細(xì)的鏈路狀態(tài)信息5Link State Ack發(fā)送確認(rèn)報(bào)文Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page9LSA報(bào)文頭部LS ageOptionsLS typeLink State IDAdvertising RouterLS sequence numberLS checksumLength1632Bits24Copyright 2009 Huawei Tec

8、hnologies Co., Ltd. All rights reserved. Page10LSA類型區(qū)域內(nèi)路由計(jì)算LS TypeLSA名稱名稱LSA描述描述1Router-LSA每一個(gè)路由器都會(huì)生成。這種LSA描述某區(qū)域內(nèi)路由器端口鏈路狀態(tài)的集合。只在所描述的區(qū)域內(nèi)泛洪。2Network-LSA由DR生成，用于描述廣播型網(wǎng)絡(luò)和NBMA網(wǎng)絡(luò)。這種LSA包含了該網(wǎng)絡(luò)上所連接路由器的列表。只在該網(wǎng)絡(luò)所屬的區(qū)域內(nèi)泛洪。Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page11LSA類型區(qū)域內(nèi)路由計(jì)算DRRoute

9、r-LSANetwork-LSAArea 1Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page12LSA類型區(qū)域間路由計(jì)算LS TypeLSA名稱名稱LSA描述描述3Network-Summary-LSA由區(qū)域邊界路由器（ABR）產(chǎn)生，描述到AS內(nèi)部本區(qū)域外部某一網(wǎng)段的路由信息，在該LSA所生成的區(qū)域內(nèi)泛洪Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page13LSA類型區(qū)域間路由計(jì)算Area 0Area 1N1ABR

10、Router-LSANetwork-Summary-LSACopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page14LSA類型AS外部路由計(jì)算LS TypeLSA名稱名稱LSA描述描述4ASBR-Summary-LSA由區(qū)域邊界路由器（ABR）產(chǎn)生，描述到某一自治系統(tǒng)邊界路由器（ASBR）的路由信息，在ABR所連接的區(qū)域內(nèi)泛洪（ASBR所在區(qū)域除外）5AS-external-LSA由自治系統(tǒng)邊界路由器（ASBR）產(chǎn)生，描述到AS外部某一網(wǎng)段的路由信息，在整個(gè)AS內(nèi)部泛洪Copyright 2009 Huawe

11、i Technologies Co., Ltd. All rights reserved. Page15LSA類型AS外部路由計(jì)算Area 0Area 1ABR使用BGP連接到另外一個(gè)ASASBR-Summary-LSAAS-external-LSAASBRCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page16Link State IDLSA名稱名稱Link State IDRouter-LSA生成這條LSA的路由器的Router IDNetwork-LSA所描述網(wǎng)段上DR的端口IP地址Network-S

12、ummary-LSA所描述的目的網(wǎng)段的地址ASBR-Summary-LSA所描述的ASBR的Router IDAS-External-LSA所描述的目的網(wǎng)段的地址Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. Page17RTDdisplay ospf lsdb router self-originate OSPF Process 1 with Router ID 4.4.4.4 Link State Database Area: 0.0.0.2Type : RouterLs id : 4.4.4.4Adv r

13、tr : 4.4.4.4 Ls age : 1125Len : 48 Options : (DC)Seq# : 80000008 Chksum : 0 x7b52Link count: 2 Link ID: 4.4.4.4 Data : 255.255.255.255 Type : StubNet Metric : 1 Link ID: 10.1.3.1 Data : 10.1.3.2 Type : TransNet Metric : 1 LS Sequence Number序列號(hào)越大表示該序列號(hào)越大表示該LSA實(shí)例越新實(shí)例越新Copyright 2009 Huawei Technologie

14、s Co., Ltd. All rights reserved. Page18RTDdisplay ospf lsdb router self-originate OSPF Process 1 with Router ID 4.4.4.4 Link State Database Area: 0.0.0.2Type : RouterLs id : 4.4.4.4Adv rtr : 4.4.4.4 Ls age : 1125Len : 48 Options : (DC)Seq# : 80000008 Chksum : 0 x7b52Link count: 2 Link ID: 4.4.4.4 Data : 255.255.255.255 Type : StubNet Metric : 1 Link ID: 10.1.3.1 Data : 10.