l3mpls原理与应用rj version第3章YESLAB讲解此仅作为知识传播

L3MPLS/原理与应 的Internet2routerripversionrouterripversionnetworknetwork9.0.0.0noauto-summary!address-familyipv4vrfABCredistributebgp1metric1network10.0.0.0noauto-summaryversion2routerbgp…address-familyipv4vrfABCredistributeripnoauto-summarynosynchronization可以在PE的VRFRIP路由协议下使用下列命令，将BGP路由重发布成为RIP路由时，可以直接将MED值到跳数中redistributebgp1metricASASASrouterrouterbgpnobgpdefaultipv4-unicastbgplog-neighbor-changesneighbor7.7.7.7remote-as1neighbor7.7.7.7update-sourceLoopback0! v4neighbor7.7.7.7activateneighbor7.7.7.7munityextendedexit-address-!address-familyipv4vrfABCredistributeneighbor10.0.15.1remote-as12neighbor10.0.15.1activate//自动生成noauto-summaryASASASr2#shr2#shipBGPtableversionis3,localrouterIDisStatuscodes:ssuppressed,ddamped,hhistory,*valid,>best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-Nextrouterrouterbgp…address-familyipv4vrfABC*>011i*>0ir2#r2#shipBGPtableversionis5,localrouterIDisStatuscodes:ssuppressed,ddamped,hhistory,*valid,>best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-Nextrouterrouterbgp*>01i*>0iAreaAreaASrouterospf1routerospf1vrfABCredistributebgp1subnetsnetwork10.0.0.00.255.255.255arearouterbgp…address-familyipv4vrfredistributeospf1matchinternalexternal1external2r1#shr1#ship…1.0.0.0/32issubnetted,1 1.1.1.1isdirectlyconnected,Loopback02.0.0.0/32issubnetted,1subnetsO 2.2.2.2[110/3]via10.0.15.5,00:00:52,10.0.0.0/24issubnetted,2 10.0.15.0isdirectlyconnected,O 10.0.27.0[110/2]via10.0.15.5,00:01:04,TypeType1\2Area AreaTypeType3Type1\2Type1\2SuperArea

Area

AreaType3Type3Area

AreaAreaSuperAreaType3Type1\2r5#shipbvaBGProutingtableentryfor1:1:1.1.1.1/32,version12Paths:(1available,best#1,tableABC)Advertisedtononpeer-groupOriginplete,metric2,localpref100,weight32768,valid,sourced,bestExtendedCommunity:RT:1:1OSPFID:0x0005:0xOSPFOSPF

0:20

修 routerrouterospf1vrf-idredistributebgp1network10.0.0.00.255.255.255area -id值不匹配,则执行ASBR的重发布动低速备份线路也运行低速备份线路也运行OSPNighborinterfaceLoopback1ipvrfforwardingABCipaddress55.55.55.55routerospf1vrfarea0sham-link55.55.55.5577.77.77.77redistributebgp1subnetsnetwork10.0.0.00.255.255.255arearouterbgp…address-familyipv4vrfredistributeospf1matchinternalexternal1external2noauto-summarynonetwork55.55.55.55maskr5#shipospf Dead

FULL/

r5#shipospfsham-ShamLinkOSPF_SL0toaddress77.77.77.77isupArea0sourceaddress55.55.55.55RunasdemandDoNotAgeLSAallowed.Costofusing1StatePOINT_TO_POINT,Timerintervalsconfigured, o10,Dead40,Wait40,odueinAdjacencyStateFULL oIndex2/2,retransmissionqueuelength0,numberofretransmission1First0x0(0)/0x0(0)Next0x0(0)/0x0(0)Lastretransmissionscanlengthis umisLastretransmissionscantimeis0 umis0Type3LSA的Down-从PE的VRFtype3LSA,在其Option字段里会存在一个Down-bit位,其他PE的VRF收到存在Down-bit位的type3LSA,仅将RoutingRoutingBitSetonthisLSALSage:26Options:(NoTOS-capability,DC,Downward)LSType:SummaryLinks(Network)LinkStateID:2.2.2.2(summaryNetworkNumber)AdvertisingRouter:10.0.15.5LSSeqNumber:Checksum:0xD7BCLength:28NetworkMask:/32TOS:0Metric:2Type5LSA的-从PE的VRFtype5LSA,会将其TAG字段填写为本 RoutingBitSetonthisLSALSage:12LSType:ASExternalLinkLinkStateID:2.2.2.2(ExternalNetworkNumber)AdvertisingRouter:10.0.15.5LSSeqLength:36NetworkMask:/32MetricType:2(Largerthananylinkstatepath)TOS:0

Type5LSA的-如果PE的VRF接收到一条type5LSA,并且其TAG值与本地BGP的routerrouterospf1vrf-tag111redistributebgp1subnetsnetwork10.0.0.00.255.255.255area 的Internet需要控制不 VRF的Export/ImportRT相对应。

exportimport

export

import

exportimport exportimport

exportimport 的Internet … ASBR… R4 R7 R7 使用nobgpdefaultroute-target- v4地址簇下针对IBGPPeer配置next-hop-ASBR互联的接口可以转发MPLS报文,但不能配置MPLSMPLS报 R7 R7 RT.1.11RT300

R7

600

ipdst300

R7

600 ipipdst300

R7

600 ipipdst300

R7

600 ipdst300

R7

600 ipipdst300

R7

600 ipipdst300

R7

600 R7 R7 顶层公网的分 routerbgp

过LDP为2.2.2.2生成给R6

R7

routerbgp RT R7 R6收到为600的报文后，下一跳动作为 200i