配置OSPF-BGP聯(lián)動(dòng)特性

1、企業(yè)案例計(jì)算機(jī)網(wǎng)絡(luò)系統(tǒng)集成項(xiàng)目（工程項(xiàng)目案例及實(shí)踐）所在系別： 計(jì)算機(jī)技術(shù)系 所屬專業(yè)： 計(jì)算機(jī)網(wǎng)絡(luò)技術(shù) 指導(dǎo)教師: 張海峰 專業(yè)負(fù)責(zé)人： 孫志成 配置OSPF-BGP聯(lián)動(dòng)特性示例介紹OSPF-BGP聯(lián)動(dòng)功能的配置過(guò)程，使得當(dāng)路由器重啟后，網(wǎng)絡(luò)流量不發(fā)生中斷。一、組網(wǎng)需求如圖1所示，所有路由器均為BGP路由器，RouterD和RouterE之間建立EBGP連接。在AS10內(nèi)的部分路由器之間建立IBGP連接，并且使用OSPF作為IGP協(xié)議。要求在RouterB上使能OSPF-BGP聯(lián)動(dòng)功能，使得當(dāng)RouterB重啟后，從RouterA到AS20的流量不發(fā)生中斷。圖1 配置OSPF-BG

2、P聯(lián)動(dòng)組網(wǎng)圖 二、配置思路采用如下的思路配置OSPF-BGP聯(lián)動(dòng)功能。1. 在RouterA、RouterB、RouterC和Router2. 在RouterA、RouterB、RouterC和Router3. 在RouterC上配置OSPF協(xié)議的開(kāi)銷值。4. 在RouterD和RouterE之間配置EBGP連接。5. 在RouterD上配置BGP引入直連路由和OSPF路由。6. 在RouterE上配置BGP。三、數(shù)據(jù)準(zhǔn)備為完成此配置例，需準(zhǔn)備如下的數(shù)據(jù)：· Router· Router· Router· Router· Router

3、四、操作步驟1. 配置各接口的IP地址（略）2. 配置OSPF的基本功能（略）3. 配置IBGP全連接# 配置RouterA。<RouterA> system-viewRouterA interface loopback 0RouterA-LoopBack0RouterA-LoopBack0 quitRouterA bgp 10RouterA-bgpRouterA-bgp RouterA-bgp RouterA-bgp RouterA-bgp RouterA-bgp RouterA-bgp RouterA-bgp quit# 配置RouterB。<RouterB> sy

4、stem-viewRouterB interface loopback 0RouterB-LoopBack0RouterB-LoopBack0 quitRouterB bgp 10RouterB-bgpRouterB-bgp RouterB-bgp RouterB-bgp RouterB-bgp RouterB-bgp pRouterB-bgp RouterB-bgp quit# 配置RouterC。<RouterC> system-viewRouterC interface loopback 0RouterC-LoopBack0RouterC-LoopBack0 quitRout

5、erC bgp 10RouterC-bgpRouterC-bgp RouterC-bgp RouterC-bgp RouterC-bgp RouterC-bgp RouterC-bgp RouterC-bgp quit# 配置RouterD。<RouterD> system-viewRouterD interface loopback 0RouterD-LoopBack0RouterD-LoopBack0 quitRouterD bgp 10RouterD-bgpRouterD-bgp RouterD-bgp RouterD-bgp RouterD-bgp RouterD-bgp

6、RouterD-bgp RouterD-bgp quit4. 配置EBGP連接# 配置RouterD。RouterD bgp 10RouterD-bgpRouterD-bgp import-route directRouterD-bgp import-route ospf 1RouterD-bgp quit# 配置RouterE。RouterE bgp 20RouterE-bgpRouterE-bgp ipv4-family unicastRouterE-bgp-af-ipv4 RouterE-bgp-af-ipv4 quit5. 配置RouterC上OSPF協(xié)議的開(kāi)銷值RouterC int

7、erface gigabitethernet 1/0/0RouterC-GigabitEthernet1/0/0 ospf cost 2RouterC-GigabitEthernet1/0/0 quitRouterC interface gigabitethernet 2/0/0RouterC-GigabitEthernet2/0/0 ospf cost 2RouterC-GigabitEthernet2/0/0 quit# 查看RouterGE1/0/0。RouterA display ip routing-tableRoute Flags: R - relied, D - download

8、 to fib -Routing Tables: Public Destinations : 16 Routes : 17 Destination/Mask Proto Pre Cost Flags NextHop Interface GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 OSPF 10 2 D Gi

9、gabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 # 查看RouterB的路由表。RouterB display ip routing-tableRoute Flags: R - relied, D - download to fib -Routing Tables: Public Destinations : 15

10、 Routes : 15 Destination/Mask Proto Pre Cost Flags NextHop Interface GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0

11、GigabitEthernet2/0/0 GigabitEthernet2/0/0 EBGP 255 0 RD GigabitEthernet2/0/0 從路由表中可以看出，RouterGE6. 在RouterB上使能OSPF-BGP聯(lián)動(dòng)功能RouterB ospf 1RouterB-ospf-1 stub-router on-startupRouterB-ospf-1 quitRouterB quit7. 查看配置結(jié)果# 重啟路由器RouterB<RouterB> rebootSystem will reboot! Continue?Y/N y# 查看RouterGE2/0/0。

12、RouterA display ip routing-tableRoute Flags: R - relied, D - download to fib -Routing Tables: Public Destinations : 17 Routes : 17 Destination/Mask Proto Pre Cost Flags NextHop Interface GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet1/0/0 GigabitE

13、thernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 EBGP 255 0 RD GigabitEthernet2/0/0 # 查看RouterB的路由表。從路由表中可以看出，由于IGP收斂速度比BGP快，所以路由表中暫時(shí)只有OSPF路由，并且開(kāi)銷值都已變?yōu)檩^大的數(shù)（65535）。Route

14、rB display ip routing-tableRoute Flags: R - relied, D - download to fib -Routing Tables: Public Destinations : 13 Routes : 13 Destination/Mask Proto Pre Cost Flags NextHop Interface OSPF 10 65536 D GigabitEthernet1/0/0 OSPF 10 65536 D GigabitEthernet2/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 OS

15、PF 10 65536 D GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 OSPF 10 65536 D GigabitEthernet2/0/0 # 再次查看RouterB的路由表。RouterB display ip routing-tableRoute Flags: R - relied, D - download to fib-Routing Tables: Public Destinations : 15 Routes : 15 Destination/Mask Proto Pre Cost Flags

16、NextHop Interface GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet1/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEthernet2/0/0 GigabitEt

17、hernet2/0/0 從路由表中可以看出，當(dāng)RouterB上的BGP完全收斂后，路由信息又恢復(fù)到重啟前的內(nèi)容。五、配置文件· RouterA的配置文件# sysname RouterA#interface GigabitEthernet1/0/0#interface GigabitEthernet2/0/0#interface LoopBack0#bgp 10 #ipv4-family unicast undo synchronization#ospf 1#return· RouterB的配置文件#sysname RouterB#interface GigabitEthe

18、rnet1/0/0#interface GigabitEthernet2/0/0#interface LoopBack0#bgp 10 #ipv4-family unicast undo synchronization#ospf 1#return· RouterC的配置文件# sysname RouterC#interface GigabitEthernet1/0/0#interface GigabitEthernet2/0/0#interface LoopBack0#bgp 10 #ipv4-family unicast undo synchronization#ospf 1#return· RouterD的配置文件# sysname RouterD#interface GigabitEthernet1/0/0#interface GigabitEthernet2/0/0#interface GigabitEthernet3/0/0#inte