利用BGP虛擬下一跳技術(shù)實(shí)現(xiàn)IP骨干網(wǎng)流量負(fù)載均衡

1、17MM4J.3Osimf173/臼4時(shí)配置說明：R1interfaceLoopback0ipaddress192.168.0.1255.255.255.255interfaceSerial1/0noshipaddress172.16.15.1255.255.255.0interfaceSerial1/1noshipaddress172.16.12.1255.255.255.0interfaceSerial1/2noshipaddress172.16.16.1255.255.255.0interfaceSerial1/3noshipaddress172.16.13.1255.255.255.0

2、I72.16.56.SJ0m.ib,臣-引引卜172.16.15.5,302.16,25,2/30si/2172.16,12.1/30172.16.12.2306.13.130I72.16.I3J/30LO:I92.16,O3/J2i；I蚣“一。而黯172.1b.26.&-302】現(xiàn)乩下和17LI6.M4說Sl/3Arm100噴需要以虛擬下一跳式和其它自治域建克EHGP鄰居關(guān)系2,168.0.232L。 ：192,168封432iproute10.0.0.1255.255.255.255172.16.13.3【虛擬下一跳地址指向真正下一跳，并由本域內(nèi) IGP(OSP 磷由引入，使本域內(nèi)所有鄰居

3、都能學(xué)習(xí)到虛擬下一跳地址的路由，從而使鄰居從自己學(xué)習(xí)到的路由能最優(yōu)化】iproute192.168.0.3255.255.255.255172.16.13.3ipprefix-listISP-Bseq5permit172.16.34.0/24【做【做前綴列表匹配需要改變下一跳的前綴】route-mapset-nexthoppermit10【做【做 route-map,改相應(yīng)前綴下一跳性】matchipaddressprefix-listISP-Bsetipnext-hop10.0.0.1route-mapset-nexthoppermit20routerospf1router-id192.16

4、8.0.1noauto-costredistributestaticmetric10metric-type1subnets【引入靜態(tài)路由，使域內(nèi)所有 IBGP 鄰居能學(xué)到虛擬下一跳地址，從面使鄰居從自己學(xué)習(xí)到的路由能最優(yōu)化】network172.16.12.00.0.0.255area0network172.16.15.00.0.0.255area0network172.16.16.00.0.0.255area0network192.168.0.00.0.0.255area0routerbgp100nosynchronizationbgprouter-id192.168.0.1bgplog-n

5、eighbor-changesneighborinternalpeer-groupneighborinternalremote-as100neighborinternalupdate-sourceLoopback0neighborinternalroute-mapset-nexthopout【做出方向的 ruout-map 改變發(fā)向鄰居路由的下一跳】neighbor192.168.0.2peer-groupinternalneighbor192.168.0.3remote-as200neighbor192.168.0.3ebgp-multihop255neighbor192.168.0.3up

6、date-sourceLoopback。neighbor192.168.0.3soft-reconfigurationinboundneighbor192.168.0.5peer-groupinternalneighbor192.168.0.6peer-groupinternalnoauto-summaryR2interfaceLoopback0ipaddress192.168.0.2255.255.255.255interfaceSerial1/0noshipaddress172.16.26.2255.255.255.0interfaceSerial1/1noshipaddress172.1

7、6.12.2255.255.255.0interfaceSerial1/2noshipaddress172.16.25.2255.255.255.0interfaceSerial1/3noshipaddress172.16.24.2255.255.255.0iproute10.0.0.1255.255.255.255172.16.24.4 【虛擬下一跳地址指向真正下一跳， 并由本域內(nèi) IGP(OSP磷由引入，使本域內(nèi)所有鄰居都能學(xué)習(xí)到虛擬下一跳地址的路由，從而使鄰居從自己學(xué)習(xí)到的路由能最優(yōu)化】iproute192.168.0.4255.255.255.255172.16.24.4ipprefi

8、x-listISP-Bseq5permit172.16.34.0/24【做前綴列表匹配需要改變下一跳的前綴】route-mapset-nexthoppermit10【做 route-map,改相應(yīng)前綴下一跳性】matchipaddressprefix-listISP-Bsetipnext-hop10.0.0.1route-mapset-nexthoppermit20routerospf1router-id192.168.0.2log-adjacency-changesnoauto-costredistributestaticmetric10metric-type1subnets【引入靜態(tài)路由，

9、使域內(nèi)所有 IBGP 鄰居能學(xué)到虛擬下一跳地址，從面使鄰居從自己學(xué)習(xí)到的路由能最優(yōu)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-changesneighborinternalpeer-groupneighborinternalremote-as100

10、neighborinternalupdate-sourceLoopback0neighborinternalroute-mapset-nexthopout【做出方向的 ruout-map 改變發(fā)向鄰居路由的下一跳】neighbor192.168.0.1peer-groupinternalneighbor192.168.0.4remote-as200neighbor192.168.0.4ebgp-multihop255neighbor192.168.0.4update-sourceLoopback0neighbor192.168.0.5peer-groupinternalneighbor192.

11、168.0.6peer-groupinternalnoauto-summaryR3由于 R3、R4 域內(nèi)沒有其它 IBGP 鄰居，的方式建立 EBGP 鄰居，可以用正常的方式建立interfaceLoopback0ipaddress192.168.0.3255.255.255.255interfaceSerial1/0noshipaddress172.16.34.3255.255.255.0interfaceSerial1/3noshipaddress172.16.13.3255.255.255.0routerospf1router-id192.168.0.3log-adjacency-cha

12、ngesnoauto-costnetwork172.16.34.00.0.0.255area0network192.168.0.00.0.0.255area0routerbgp200nosynchronizationbgprouter-id192.168.0.3bgplog-neighbor-changesnetwork1.0.0.0network172.16.34.0mask255.255.255.0下掛設(shè)備都運(yùn)行 IGP 所以不需要以虛擬下一跳EBGP 鄰居即可neighbor192.168.0.1remote-as100neighbor192.168.0.1ebgp-multihop25

13、5neighbor192.168.0.1update-sourceLoopback0neighbor192.168.0.1soft-reconfigurationinboundneighbor192.168.0.4remote-as200neighbor192.168.0.4update-sourceLoopback0noauto-summaryiproute0.0.0.00.0.0.0172.16.13.1iproute1.0.0.0255.0.0.0Null0iproute192.168.0.1255.255.255.255172.16.13.1【R4】由于 R3、R4 域內(nèi)沒有其它舊舊

14、GP 鄰居，下掛設(shè)備都運(yùn)行 IGP 所以不需要以虛擬下一跳的方式建立 EBGP 鄰居，可以用正常的方式建立 EBGP 鄰居即可interfaceLoopback0ipaddress192.168.0.4255.255.255.255interfaceSerial1/0noshipaddress172.16.34.4255.255.255.0serialrestart-delay0interfaceSerial1/3noshipaddress172.16.24.4255.255.255.0serialrestart-delay0routerospf1router-id192.168.0.4log

15、-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-multihop255neighbor192.168.0

16、.2update-sourceLoopback0neighbor192.168.0.3remote-as200neighbor192.168.0.3update-sourceLoopback0noauto-summaryiproute0.0.0.00.0.0.0172.16.24.2iproute1.0.0.0255.0.0.0Null0iproute192.168.0.2255.255.255.255172.16.24.2R5R5、R6 屬于域內(nèi)設(shè)備不建立 EBGP 鄰居關(guān)系，也只要以正常方式與域內(nèi)其它設(shè)備建立舊 GP 鄰居關(guān)系即可interfaceLoopback0ipaddress192

17、.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-costnetwork172.16.0.00.0.255.255area0network192.168.0

18、.00.0.0.255area0routerbgp100nosynchronizationbgprouter-id192.168.0.5bgplog-neighbor-changesneighborinternalpeer-groupneighborinternalremote-as100neighborinternalupdate-sourceLoopback0neighbor192.168.0.1peer-groupinternalneighbor192.168.0.2peer-groupinternalneighbor192.168.0.6peer-groupinternalnoauto-summaryR6R5、R6 屬于域內(nèi)設(shè)備不建立 EBGP 鄰居關(guān)系，也只要以正常方式與域內(nèi)其它設(shè)備建立舊 GP 鄰居關(guān)系即可interfaceLoopback0ipaddress1