利用BGP虚拟下一跳技术实现IP骨干网流量负载均衡

1、利用BGP虚拟下一跳技术实现IP骨干网流量负载均衡19LE施加血nI72JKII72.1KI53.W172.16.15.1 Wl?2 IMfi.l .UJgG Mni.lft.26.1734LMZJUXI72.lll.l.l17210.12/50LI的2E2Jh3LWl-2 I6J4 J.3UI72.1MJJ.J019工I MUM 32IMMbS.rl J.l：17L1k34 3 刑I7L16J44初172.1565.1l72,lh.56,i.Wrca I 制Sl/0l下工J MW乩&于，RU般需要以虚撒卜，跳 啰发和共定官渣蜕建立 .L1K津郁居关名配置说明：【R1】interfaceLoo

2、pback。ipaddress192.168.0.1255.255.255.255interfaceSerial1/0noshipaddress172.16.15.1255.255.255.0interfaceSeriall/1noshipaddress172.16.12.1255.255.255.0interfaceSeriall/2noshipaddress172.16.16.1255.255.255.0interfaceSeriall/3noshipaddress172.16.13.1255.255.255.0ip route172. 16. 13. 3【虚拟下一跳地址指向真正下一10.

3、0.0.1255.255.255.255跳，并由本域内IGP(OSPF)路由引入，使本域内所有邻居都能学习到虚拟下一跳地址的路由，从而使邻居从自己学习到的路由能最优化1iproute192.168.0.3255.255.255.255172.16.13.3ipprefix-listISP-Bseq5permit172.16.34.0/24【做前缀列表匹配需要改变下一跳的前缀】route-mapset-nexthoppermit10【做route-map,改相应前缀下一跳性】matchipaddressprefix-listISP-Bsetipnext-hop10.0.0.1route-maps

4、et-nexthoppermit20routerospf1router-id192.168.0.1noauto-costredistributestaticmetric10metric-type1subnets【引入静态路由，使域内所有旧GP邻居能学到虚拟下一跳地址，从面使邻居从自己学习到的路由能最优化】network172.16.12.00.0.0.255area0network172.16.15.00.0.0.255area0network172.16.16.00.0.0.255area0network192.168.0.00.0.0.255area0routerbgp100nosynch

5、ronizationbgprouter-id192.168.0.1bgplog-neighbor-changesneighborinternalpeer-groupneighborinternalremote-as100neighborinternalupdate-sourceLoopback。neighborinternalroute-mapset-nexthopout【做出方向的ruout-map改变发向邻居路由的下一跳】neighbor192.168.0.2peer-groupinternalneighbor192.168.0.3remote-as200neighbor192.168.0

6、.3ebgp-multihop255neighbor192.168.0.3update-sourceLoopback0neighbor192.168.0.3soft-reconfigurationinboundneighbor192.168.0.5peer-groupinternalneighbor192.168.0.6peer-groupinternalnoauto-summary【RZinterfaceLoopback。ipaddress192.168.0.2255.255.255.255interfaceSerial1/0noshipaddress172.16.26.2255.255.2

7、55.0interfaceSerial1/1noshipaddress172.16.12.2255.255.255.0interfaceSerial1/2noshipaddress172.16.25.2255.255.255.0interface Serial1/3noshipaddress172.16.24.2255.255.255.0iproute10.0.0.1255.255.255.255172.16.24.4【虚拟下一跳地址指向真正下一跳，并由本域内IGP(OSPF路由引入，使本域内所有邻居都能学习到虚拟下一跳地址的路由，从而使邻居从自己学习到的路由能最优化】iproute192.1

8、68.0.4255.255.255.255172.16.24.4ipprefix-listISP-Bseq5permit172.16.34.0/24【做前缀列表匹配需要改变下一跳的前缀】route-mapset-nexthoppermit10【做route-map,改相应前缀下一跳性】matchipaddressprefix-listISP-Bsetipnext-hop10.0.0.1route-mapset-nexthoppermit20routerospf1router-id192.168.0.2log-adjacency-changesnoauto-costredistributesta

9、ticmetric10metric-type1subnets【引入静态路由，使域内所有旧GP邻居能学到虚拟下一跳地址，从面使邻居从自己学习到的路由能最优化】network172.16.12.00.0.0.255area0network172.16.25.00.0.0.255area0network172.16.26.00.0.0.255area0network192.168.0.00.0.0.255area0routerbgp100nosynchronizationbgprouter-id192.168.0.2bgplog-neighbor-changesneighborinternalpee

10、r-groupneighborinternalremote-as100neighborinternalupdate-sourceLoopback。neighborinternalroute-mapset-nexthopout【做出方向的ruout-map改变发向邻居路由的下一跳】neighbor192.168.0.1peer-groupinternalneighbor192.168.0.4remote-as200neighbor192.168.0.4ebgp-multihop255neighbor192.168.0.4update-sourceLoopback。neighbor192.168.

11、0.5peer-groupinternalneighbor192.168.0.6peer-groupinternalnoauto-summary【R3I由于R&R4域内没有其它IBGP邻居，下挂设备都运行IGP所以不需要以虚拟下一跳的方式建立EBGP邻居，可以用正常的方式建立EBG即居即可interfaceLoopback0ipaddress192.168.0.3255.255.255.255interfaceSerial1/0noshipaddress172.16.34.3255.255.255.0interfaceSerial1/3noshipaddress172.16.13.3255.2

12、55.255.0routerospf1router-id192.168.0.3log-adjacency-changesnoauto-costnetwork172.16.34.00.0.0.255area0network192.168.0.00.0.0.255area0routerbgp200nosynchronizationbgprouter-id192.168.0.3bgplog-neighbor-changesnetwork1.0.0.0network172.16.34.0mask255.255.255.0neighbor192.168.0.1remote-as100neighbor19

13、2.168.0.1ebgp-multihop255neighbor192.168.0.1update-sourceLoopback。neighbor192.168.0.1soft-reconfigurationinboundneighbor192.168.0.4remote-as200neighbor192.168.0.4update-sourceLoopback0noauto-summaryiproute0.0.0.00.0.0.0172.16.13.1iproute1.0.0.0255.0.0.0Null0iproute192.168.0.1255.255.255.255172.16.13

14、.1【R4由于R&R4域内没有其它IBGP邻居，下挂设备都运行IGP所以不需要以虚拟下一跳的方式建立EBGP邻居，可以用正常的方式建立EBG即居即可interfaceLoopback。ipaddress192.168.0.4255.255.255.255interface Serial1/12noshipaddress172.16.34.4255.255.255.0serialrestart-delay0interfaceSerial1/3noshipaddress172.16.24.4255.255.255.0serialrestart-delay0routerospf1router-id1

15、92.168.0.4log-adjacency-changesnoauto-costnetwork172.16.34.00.0.0.255area0network192.168.0.00.0.0.255area0routerbgp200nosynchronizationbgprouter-id192.168.0.4bgplog-neighbor-changesnetwork1.0.0.0network172.16.34.0mask255.255.255.0neighbor192.168.0.2remote-as100neighbor192.168.0.2ebgp-multihop255neig

16、hbor192.168.0.2update-sourceLoopback。neighbor192.168.0.3remote-as200neighbor192.168.0.3update-sourceLoopback0noauto-summaryiproute0.0.0.00.0.0.0172.16.24.2iproute1.0.0.0255.0.0.0Null0iproute192.168.0.2255.255.255.255172.16.24.2R5IRSR6属于域内设备不建立EBG审居关系，也只要以正常方式与域内其它设备建立邻居关系即可interfaceLoopback0ipaddres

17、s192.168.0.5255.255.255.255interfaceSerial1/0noshipaddress172.16.15.5255.255.255.0interfaceSerial1/1noshipaddress172.16.56.5255.255.255.0interfaceSerial1/2noshipaddress172.16.25.5255.255.255.0routerospf1router-id192.168.0.5log-adjacency-changesnoauto-costnetwork172.16.0.00.0.255.255area0network192.1

18、68.0.00.0.0.255area0routerbgp100nosynchronizationbgprouter-id192.168.0.5bgplog-neighbor-changesneighborinternalpeer-groupneighborinternalremote-as100neighborinternalupdate-sourceLoopback。neighbor192.168.0.1peer-groupinternalneighbor192.168.0.2peer-groupinternalneighbor192.168.0.6peer-groupinternalnoauto-summaryR6IR5R6属于域内设备不建立EBG审居关系，也只要以正常方式与域内其它设备建立旧GP邻居关系即可interfaceLoopback。ipaddress1