ccnp 4 3configuring basic operations仅执行命令routerbgp并不能在路由器上激活BGP必须至

Router(config-router)#neighborRouter(config-router)#neighbor{ip-address|peer-group-name}remote-asautonomous-systemrouterrouterbgpneighbor3.3.3.3remoterouterbgpneighbor10.1.34.3remote

EBGPAS

ASrouterrouterbgpneighbor1.1.1.1remoteneighbor10.1.34.4remoteRouter(config-router)#neighborRouter(config-router)#neighbor{ip-address|peer-group-name}update-sourceinterface-typeinterface-numberrouterrouterbgpneighbor3.3.3.3remoteneighbor3.3.3.3update-sourceloopback0routerospf1network10.1.12.00.0.0.255areanetwork1.1.1.10.0.0.0area

EBGPAS

ASrouterbgprouterbgpneighbor1.1.1.1remoteneighbor1.1.1.1update-sourceloopback0neighbor10.1.34.4remote400routerospfnetwork10.1.23.00.0.0.255areanetwork3.3.3.30.0.0.0areaRouter(config-router)#Router(config-router)#neighbor{ip-address|peer-group-name}ebgp-multihop[ttl]EBGPABAS ASrouterrouterbgpneighbor2.2.2.2remoteneighbor2.2.2.2update-sourceloopback0neighbor2.2.2.2ebgp-multihop2iproute2.2.2.2255.255.255.255routerbgpneighbor1.1.1.1remoteneighbor1.1.1.1update-sourceloopback0neighbor1.1.1.1ebgp-multihop2iproute1.1.1.1255.255.255.255Router(config-router)#networkRouter(config-router)#networknetwork-number[masknetwork-mask][route-mapmap-tag]showip #showipBGPtableversionis14,localrouterIDisStatuscodes:ssuppressed,ddamped,hhistory,*valid,>best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e- Next

?- LocPrfWeight*>0i*00i*>0i00i*>0i*0i*00i*>00i*0i*00ir>00ir0ir00i*>00i<outputshowipbgprib- #showipbgprib-failureNextHopHigheradmindistanceHigheradminRIB-NHIBGPIBGPASASRouteRouteASASR1、R2不知道如何去往10.1.34.4，因此路由不可达，也就不是Router(config-router)#neighborRouter(config-router)#neighbor{ip-address|peer-group-name}next-hop-RouteRouteASASRouterouterbgpneighbor1.1.1.1remoteneighbor1.1.1.1update-sourceloopback0neighbor1.1.1.1next-hop-selfneighbor2.2.2.2remoteneighbor2.2.2.2.update-sourceloopback0neighbor2.2.2.2next-hop-self禁用同步，则BGP可以使用从IBGP邻居那里获悉的但没有出现在本地路由表中的路由，并将其通告给外部BGP邻居。CiscoIOS默认禁用同步。BGP同步规则的问题：若将BGP路由发布到IGP中,那么是IGP路由器要数以结论：通常BGP路由的正常传递：1.同步问题2.Router(config-router)#noRouter(config-router)#noPeerRouter(config-router)#neighborRouter(config-router)#neighborip-addresspeer-grouppeer-group- •Peer不使用peerrouterbgpneighbor192.168.24.1remote-asneighbor192.168.24.1update-sourceLoopbackneighbor192.168.24.1next-hop-neighbor192.168.24.1distribute-list20

routerbgp

使用peerneighbor192.168.25.1remote-asneighbor192.168.25.1update-sourceLoopbackneighbor192.168.25.1next-hop-neighbor192.168.25.1distribute-list20neighbor192.168.26.1remote-asneighbor192.168.26.1update-sourceLoopbackneighbor192.168.26.1next-hop-neighbor192.168.26.1distribute-list20

neighborinternalpeer-groupneighborinternalremote-as65100neighborinternalupdate-sourceLoopback0neighborinternalnext-hop-selfneighborinternaldistribute-list20outneighbor192.168.24.1peer-groupinternalneighbor192.168.25.1peer-groupinternalneighbor192.168.26.1peer-group Router(config-router)#neighborRouter(config-router)#neighbor{ip-address|peer-group-password neighborneighbor{ip-address|peer-group-name}nononeighbor{ip-address|peer-group-name} R1(config)#routerbgp

RR从 s和 从non s和

子AS之间是EBGPPeer，但不改变R4(config)#routerbgpR4(config-router)#bgpconfederationidentifier100 R4(config-router)#bgpconfederationpeers65050 R4(config-router)#neighbor20.0.0.1remote-as65050//指定 R4(config-router)#neighborx.x.x.xremote-as65060 内部的IBGP邻居断开相应的TCPclearipbgpclearipbgp{neighbor-clearipbgp*showipbgpneighbors{address}showipshowipbgpneighbors{address}advertised-debugipbgpupdates #debugipbgprouterdebuggingisonforaddressfamily:IPv4Unicast #clearipbgp10.1.0.2<output*Feb2411:06:41.309:%BGP-5-ADJCHANGE:neighbor10.1.0.2*Feb2411:06:41.309:BGP(0):10.1.0.2sendUPDATE10.1.1.0/24,next10.1.0.1,metric0,path*Feb2411:06:41.309:BGP(0):10.1.0.2sendUPDATE(prepend,chgflags:0x0)10.1.0.0/24,next10.1.0.1,metric0,pathLocal*Feb2411:06:41.309:BGP(0):10.1.0.2NEXT_HOPpart110.97.97.0/24,next*Feb2411:06:41.309:BGP(0):10.1.0.2sendUPDATE10.97.97.0/24,next172.31.11.4,metric0,path64999*Feb2411:06:41.309:BGP(0):10.1.0.2NEXT_HOPpart1172.31.22.0/24,next*Feb2411:06:41.309:BGP(0):10.1.0.2sendUPDATE172