IBGP水平分割：从一个IBGP学到的BGP路由不会传到另一个IBGP

1、IBGPR223.0.0.0/24R4EB45.0.0.0/24R31.1.1.1/240R1R5Lo03.3EBGP_.-12.0.0.0/243.3/32ibgpLo04.4.4.4/32Lo02.2.2/3234.0.0.0/24IBGP水平分割：从一个IBGP学到的BGP路由不会传到另一个IBGP解决办法RR(路由反射器)可以指定他的客户1、如果一条路由通过客户学习到，那么会反射到客户、非客户、EBGP邻居2、如果一条路由通过EBGP邻居学习到，那么会反射给客户、非客户、EBGP邻居3、如果一条路由通过非客户学习到，那么会反射给客户和EBGP邻居，不会反射给非客户R1(config)#

2、ints2/1R1(config-if)#ipadd12.0.0.1255.255.255.0R1(config-if)#noshuR1(config-if)#intlo0R1(config-if)#ipadd1.1.1.1255.255.255.0R1(config-if)#doping12.0.0.2Typeescapesequencetoabort.Sending5,100-byteICMPEchosto12.0.0.2,timeoutis2seconds:!Successrateis100percent(5/5),round-tripmin/avg/max=24/58/96msR1(c

3、onfig-if)#routerbgp100R1(config-router)#bgprouter-id1.1.1.1R1(config-router)#nei12.0.0.2remote-as234R1(config-router)#net1.1.1.0mask255.255.255.0R1(config-router)#*Sep1219:39:51.659:%BGP-5-ADJCHANGE:neighbor12.0.0.2UpR1(config-router)#doshipbgpBGPtableversionis3,localrouterIDis1.1.1.1Statuscodes:ssu

4、ppressed,ddamped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteMetricLocPrfWeightPath032768iMetricLocPrfWeightPath032768i*1.1.1.0/240.0.0.0*5.5.5.0/2412.0.0.20234500iR1(config-router)#doshiprouteCodes:C-connected,S-static,R-RIP,M-mobile,B-BGPD-EIGRP,EX-EIGRPe

5、xternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnotset1.

6、0.0.0/24issubnetted,1subnetsC1.1.1.0isdirectlyconnected,Loopback05.0.0.0/24issubnetted,1subnetsB5.5.5.020/0via12.0.0.2,00:05:0612.0.0.0/24issubnetted,1subnetsC12.0.0.0isdirectlyconnected,Serial2/1R2(config)#ints2/1R2(config-if)#ipadd12.0.0.2255.255.255.0R2(config-if)#noshuR2(config-if)#ints2/2R2(con

7、fig-if)#ipadd23.0.0.2255.255.255.0R2(config-if)#noshuR2(config-if)#doping23.0.0.3Typeescapesequencetoabort.Sending5,100-byteICMPEchosto23.0.0.3,timeoutis2seconds:!Successrateis100percent(5/5),round-tripmin/avg/max=12/65/144msR2(config)#routereigrp90R2(config-router)#noauR2(config-router)#net23.0.0.0

8、0.0.0.255R2(config-router)#net2.2.2.20.0.0.0R2(config-router)#intlo0R2(config-if)#ipadd2.2.2.2255.255.255.255R2(config)#routerbgp234R2(config-router)#bgprouter-id2.2.2.2R2(config-router)#nosynR2(config-router)#noauR2(config-router)#nei3.3.3.3remote-as234R2(config-router)#nei3.3.3.3uplo0R2(config-rou

9、ter)#nei12.0.0.1remote-as100R2(config-router)#*Sep1219:39:54.599:%BGP-5-ADJCHANGE:neighbor12.0.0.1UpR2(config-router)#exitR2(config-router)#*Sep1219:42:41.763:%BGP-5-ADJCHANGE:neighbor3.3.3.3UpR2(config-router)#doshipbgpsumBGProuteridentifier2.2.2.2,localASnumber234BGPtableversionis2,mainroutingtabl

10、eversion21networkentriesusing101bytesofmemory1pathentriesusing48bytesofmemory1BGPpathattributeentriesusing60bytesofmemory1BGPAS-PATHentriesusing24bytesofmemory0BGProute-mapcacheentriesusing0bytesofmemory0BGPfilter-listcacheentriesusing0bytesofmemoryBGPusing233totalbytesofmemoryBGPactivity1/0prefixes

11、,1/0paths,scaninterval60secsNeighborVASMsgRcvdMsgSent3.3.3.3423467TblVerInQOutQUp/DownState/PfxRcdNeighborVASMsgRcvdMsgSent3.3.3.3423467TblVerInQOutQUp/DownState/PfxRcd20000:02:35012.0.0.1410010920000:05:231R2(config-router)#doshipbgpBGPtableversionis2,localrouterIDis2.2.2.2Statuscodes:ssuppressed,d

12、damped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteNetworkNextHopMetricLocPrfWeightPath*1.1.1.0/2412.0.0.100100iR2(config)#routerbgp234R2(config-router)#nei3.3.3.3next-hop-self/R3开始学到了1.1.1.0/24没有优化的路由，因为下一跳不可达，要在R2上给R3指明next-hop-self*Sep1219:48:50.667:%BGP

13、-5-ADJCHANGE:neighbor3.3.3.3UpR2(config-router)#doshipbgpBGPtableversionis3,localrouterIDis2.2.2.2Statuscodes:ssuppressed,ddamped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteMetricLocPrfWeightPath00100iMetricLocPrfWeightPath00100i*1.1.1.0/2412.0.0.1*i5.5.5.

14、0/244.4.4.401000500i*i5.5.5.0/244.4.4.401000500iR3(config)#ints2/1R3(config-if)#ipadd23.0.0.3255.255.255.0R3(config-if)#noshuR3(config-if)#ints2/2R3(config-if)#ipadd34.0.0.3255.255.255.0R3(config-if)#noshuR3(config-if)#doping34.0.0.4Typeescapesequencetoabort.Sending5,100-byteICMPEchosto34.0.0.4,time

15、outis2seconds:!Successrateis100percent(5/5),round-tripmin/avg/max=20/68/112msR3(config-if)#routereigrp90R3(config-router)#noauR3(config-router)#net23.0.0.00.0.0.255R3(config-router)#net34.0.0.00.0.0.255R3(config-router)#net3.3.3.30.0.0.0R3(config-router)#intlo0R3(config-if)#ipadd3.3.3.3255.255.255.2

16、55R3(config-if)#routerbgp234R3(config-router)#bgprouR3(config-router)#bgprouter-id3.3.3.3R3(config-router)#nosynR3(config-router)#noauR3(config-router)#nei2.2.2.2remote-as234R3(config-router)#nei2.2.2.2uplo0R3(config-router)#nei4.4.4.4remote-as234R3(config-router)#nei4.4.4.4uplo0*Sep1219:42:54.131:%

17、BGP-5-ADJCHANGE:neighbor2.2.2.2UpR3(config-router)#*Sep1219:43:06.723:%BGP-5-ADJCHANGE:neighbor4.4.4.4UpR3(config-router)#doshipbgp/因为下一跳不可达BGPtableversionis1,localrouterIDis3.3.3.3Statuscodes:ssuppressed,ddamped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incomplete

18、NetworkNextHopMetricLocPrfWeightPathi1.1.1.0/2412.0.0.101000100ii5.5.5.0/2445.0.0.501000500iR3(config-router)#doshipbgpBGPtableversionis2,localrouterIDis3.3.3.3Statuscodes:ssuppressed,ddamped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteNetworkNextHopMetricL

19、ocPrfWeightPath*i1.1.1.0/242.2.2.201000100i*i5.5.5.0/2445.0.0.501000500iR3(config-router)#doshipbgp/下一跳可达，在R2和R4上做next-hop-selfBGPtableversionis3,localrouterIDis3.3.3.3Statuscodes:ssuppressed,ddamped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteNetworkNextHo

20、pMetricLocPrfWeightPath*i1.1.1.0/242.2.2.201000100i*i5.5.5.0/244.4.4.401000500iR3(config)#routerbgp234R3(config-router)#nei2.2.2.2route-reflector-client/指明R2为自己的客户，符合第一条R3(config-router)#*Sep1219:48:33.619:%BGP-5-ADJCHANGE:neighbor2.2.2.2DownRRclientconfigchangeR3(config-router)#*Sep1219:49:03.139:%

21、BGP-5-ADJCHANGE:neighbor2.2.2.2UpR3(config-router)#R4(config)#ints2/1R4(config-if)#ipadd34.0.0.4255.255.255.0R4(config-if)#noshuR4(config-if)#ints2/2R4(config-if)#ipadd45.0.0.4255.255.255.0R4(config-if)#noshuR4(config-if)#doping45.0.0.5Typeescapesequencetoabort.Sending5,100-byteICMPEchosto45.0.0.5,t

22、imeoutis2seconds:!Successrateis100percent(5/5),round-tripmin/avg/max=4/66/156msR4(config-if)#routereigrp90R4(config-router)#noauR4(config-router)#net34.0.0.00.0.0.255R4(config-router)#net4.4.4.40.0.0.0R4(config-router)#intlo0R4(config-if)#ipadd4.4.4.4255.255.255.255R4(config-if)#routerbgp234R4(confi

23、g-router)#bgprouR4(config-router)#bgprouter-id4.4.4.4R4(config-router)#nosynR4(config-router)#noauR4(config-router)#nei3.3.3.3remote-as234R4(config-router)#nei3.3.3.3uplo0R4(config-router)#nei45.0.0.5remote-as500R4(config-router)#*Sep1219:41:59.647:%BGP-5-ADJCHANGE:neighbor45.0.0.5UpR4(config-router

24、)#*Sep1219:43:10.147:%BGP-5-ADJCHANGE:neighbor3.3.3.3UpR4(config-router)#doshipbgpBGPtableversionis2,localrouterIDis4.4.4.4Statuscodes:ssuppressed,ddamped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteNetworkNextHopMetricLocPrfWeightPath*5.5.5.0/2445.0.0.5005

25、00iR4(config-router)#exitR4(config)#routerbgp234R4(config-router)#nei3.3.3.3next-hop-selfR4(config-router)#doshipbgpBGPtableversionis3,localrouterIDis4.4.4.4Statuscodes:ssuppressed,ddamped,hhistory,*valid,best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteMetricLocPrfWeightPath01

26、000100iMetricLocPrfWeightPath01000100i*i1.1.1.0/242.2.2.2*5.5.5.0/2445.0.0.500500iR5(config)#ints2/2R5(config-if)#ipadd45.0.0.5255.255.255.0R5(config-if)#noshuR5(config-if)#intlo0R5(config-if)#ipadd5.5.5.5255.255.255.0R5(config-if)#routerbgp500R5(config-router)#bgprouR5(config-router)#bgprouter-id5.5.5.5R5(config-router)#nosynR5(config-router)#noauR5(config-router)#nei45.0.0.4remote-as234R5(config-router)#net5.5.5.0mask255.255.255.0R5(config-router)#dos