bgp选路规则实验

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1、BGP选路规则实验1.使R1，R2，R3，R4全网建立BGP，并且互通（1）将R3加入BGP中R1：r1(config)#routerbgp1r1(config-router)#neighbor3.3.3.3remote-as1r1(config-router)#neighbor3.3.3.3update-sourceloopback0 R3：r3(config)#routerbgp1r3(config-router)#bgprouter-id3.3.3.3r3(config-router)#neighbor1.1.1.1remote-as1r3(conf

2、ig-router)#neighbor1.1.1.1update-sourceloopback0 r3(config-router)#neighbor4.4.4.4remote-as4r3(config-router)#neighbor4.4.4.4update-sourceloopback0r3(config-router)#neighbor4.4.4.4ebgp-multihop R4：r4(config)#routerbgp4r4(config-router)#neighbor3.3.3.3remote-as1r4(config-router)#ne

3、ighbor3.3.3.3update-sourceloopback0r4(config-router)#neighbor3.3.3.3ebgp-multihop （2）查看R3的BGP邻居r3#shipbgsummaryBGProuteridentifier3.3.3.3,localASnumber1BGPtableversionis4,mainroutingtableversion43networkentriesusing351bytesofmemory3pathentriesusing156bytesofmemory3/2BGPpath/bestpa

4、thattributeentriesusing372bytesofmemory1BGPAS-PATHentriesusing24bytesofmemory0BGProute-mapcacheentriesusing0bytesofmemory0BGPfilter-listcacheentriesusing0bytesofmemoryBGPusing903totalbytesofmemoryBGPactivity3/0prefixes,3/0paths,scaninterval60secs Neighbor       V   ASMsgRcvdMsgSen

5、t  TblVer InQOutQUp/Down State/PfxRcd1.1.1.1        4    1      7      7       4   0   000:02:08       14.4.4.4        4    4      7      5       4   0   000:00:08       2r3#说明：R3已经与其它路由器建立BGP邻居。  2.改变AS1内部下一跳（1）查看R1的BGP路由表r1#shipbgpBGPtableversionis6,localrouterIDis1.1.1.1Statusc

6、odes:ssuppressed,ddamped,hhistory,*valid,>best,i-internal,             rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incomplete   Network         NextHop           MetricLocPrfWeightPath*>11.1.1.0/24     0.0.0.0                 0        32768i*>i22.2.2.0/24     2.2.2.2             

7、    0   100     0?*i44.4.4.0/24     4.4.4.4                 0   100     04i*>i                4.4.4.4                 0   100     04iri100.1.1.0/24    4.4.4.4                 0   100     04ir>i                4.4.4.4                 0   100     04ir1#说明：因为R1都是从iBGP收到的路由，所以到达R4的路由4

8、4.4.4.0的下一跳都为4.4.4.4，而没有被R2和R3改变。