021BGP对等体组资料

1、IPA-taskpacket21:BGPM等体组实验二-一:GP对等体组实验目标：掌握BGP对等体组的配置方法实验TOP物理拓扑逻辑拓扑clientAS1234AS5>IBGPEBGP基本配置R1（没有配置对等体组）hostnameR1interfaceLoopback0ipaddress1.1.1.1255.255.255.0interfaceLoopback10ipaddress10.10.10.10255.255.255.0ipospfnetworkpoint-to-pointinterfaceSerial1/0ipaddress12.1.1.1255.255.255.0inter

2、faceSerial1/1ipaddress13.1.1.1255.255.255.0!interfaceSerial1/2ipaddress14.1.1.1255.255.255.0!interfaceSerial1/3ipaddress15.1.1.1255.255.255.0!routerospf10router-id1.1.1.1log-adjacency-changesnetwork10.10.10.00.0.0.255area0network12.1.1.00.0.0.255area0network13.1.1.00.0.0.255area0network14.1.1.00.0.0

3、.255area0!routerbgp1234nosynchronizationbgprouter-id1.1.1.1bgplog-neighbor-changesnetwork1.1.1.0mask255.255.255.0neighbor15.1.1.5remote-as5neighbor20.20.20.20remote-as1234neighbor20.20.20.20update-sourceLoopback10neighbor20.20.20.20route-reflector-clientneighbor20.20.20.20next-hop-selfneighbor30.30.

4、30.30remote-as1234neighbor30.30.30.30update-sourceLoopback10neighbor30.30.30.30route-reflector-clientneighbor30.30.30.30next-hop-selfneighbor40.40.40.40remote-as1234neighbor40.40.40.40update-sourceLoopback10neighbor40.40.40.40route-reflector-clientneighbor40.40.40.40next-hop-selfnoauto-summary!R2!ho

5、stnameR2!interfaceLoopback0ipaddress2.2.2.2255.255.255.0interfaceLoopback10ipaddress20.20.20.20255.255.255.0ipospfnetworkpoint-to-point!interfaceSerial1/0ipaddress12.1.1.2255.255.255.0!routerospf10router-id2.2.2.2log-adjacency-changesnetwork12.1.1.00.0.0.255area0network20.20.20.00.0.0.255area0!route

6、rbgp1234nosynchronizationbgprouter-id2.2.2.2bgplog-neighbor-changesnetwork2.2.2.0mask255.255.255.0neighbor10.10.10.10remote-as1234neighbor10.10.10.10update-sourceLoopback10noauto-summary!R3!hostnameR3!interfaceLoopback0ipaddress3.3.3.3255.255.255.0!interfaceLoopback10ipaddress30.30.30.30255.255.255.

7、0ipospfnetworkpoint-to-point!interfaceSerial1/0ipaddress13.1.1.3255.255.255.0!routerospf10router-id3.3.3.3log-adjacency-changesnetwork13.1.1.00.0.0.255area0network30.30.30.00.0.0.255area0!routerbgp1234nosynchronizationbgprouter-id3.3.3.3bgplog-neighbor-changesnetwork3.3.3.0mask255.255.255.0neighbor1

8、0.10.10.10remote-as1234neighbor10.10.10.10update-sourceLoopback10noauto-summary!R4!hostnameR4!interfaceLoopback0ipaddress4.4.4.4255.255.255.0!interfaceLoopback10ipaddress40.40.40.40255.255.255.0ipospfnetworkpoint-to-point!interfaceSerial1/0ipaddress14.1.1.4255.255.255.0!routerospf10router-id4.4.4.4l

9、og-adjacency-changesnetwork14.1.1.00.0.0.255area0network40.40.40.00.0.0.255area0!routerbgp1234nosynchronizationbgprouter-id4.4.4.4bgplog-neighbor-changesnetwork4.4.4.0mask255.255.255.0neighbor10.10.10.10remote-as1234neighbor10.10.10.10update-sourceLoopback10noauto-summary!R5!hostnameR5interfaceLoopb

10、ack0ipaddress5.5.5.5255.255.255.0!interfaceSerial1/0ipaddress15.1.1.5255.255.255.0!routerbgp5nosynchronizationbgprouter-id5.5.5.5bgplog-neighbor-changesnetwork5.5.5.0mask255.255.255.0neighbor15.1.1.1remote-as1234noauto-summary!基本配置完成后，用ping命令检测所有路由器的lo0接口能否相互ping通。BGP对等体组在BGP的实现中会出现很大很复杂的配置，如果很多邻居的更

11、新策略相同，可以将更新策略相同的邻居划分到一个对等体组中，以简化配置。此外，配置了对等体组的路由器只需咨询一次策略数据库，创建一条更新信息，然后拷贝多个分发给所有对等体组成员，提高了更新效率，节省了CPU的资源消耗。本实验把R1-R4放到了路由反射器的应用环境中，其中R1是RR;R2,R3,R4是反射器的客户端。如果在RR上配置对等体组，可以减小反射器和客户的收敛时间，使其整网收敛性能改变。总结：配置对等体组的好处1简化配置，增强可读性2提高更新效率，节省CPU消耗配置步骤1步：创建对等体组名称使用命令neighborpeer-group-namepeer-grouppeer-group-na

12、me具有本地意义，本实验名称为2-42步：给对等体组定义参数使用命令neighborpeer-group-name本实验定义了4个相同的参数1）指定相同ibgp邻居2）更新源3）路由反射器4）指定下一跳3步：将具有共同特性的邻居放入对等体组中使用命令neighboripaddresspeer-grouppeer-group-nameR1BGP配置（使用对等体组）!routerbgp1234nosynchronizationbgprouter-id1.1.1.1bgplog-neighbor-changesnetwork1.1.1.0mask255.255.255.0neighbor2-4pee

13、r-groupneighbor2-4remote-as1234neighbor2-4update-sourceLoopback10neighbor2-4route-reflector-clientneighbor2-4next-hop-selfneighbor20.20.20.20peer-group2-4neighbor30.30.30.30peer-group2-4neighbor40.40.40.40peer-group2-4neighbor15.1.1.5remote-as5noauto-summary!从配置结果可以看到在对等体数量不多，及应用策略少的情况下，配置并没有太多简化。通过

14、showipbgppeer-grouppeer-groupname可以察看BGP对等体相应的信息。通过clearipbgppeer-grouppeer-groupname可以重启对等体组令S居会话做好了对等体组策略后，如果再为单个对等体组成员定义路由策略，会有什么效果在R1上指定单个对等体出站的路由策略R1(config-router)#neighbor20.20.20.20distribute-list10out%Invalidcommandforapeer-groupmemberR1(config-router)#neighbor20.20.20.20prefix-list10out%In

15、validcommandforapeer-groupmemberR1(config-router)#neighbor20.20.20.20filter-list10out%Invalidcommandforapeer-groupmember发现这些命令为无效，由此可以得出：不可以为单个对等体组成员定义出站路由策略，路由策略中包括distribute-list,prefix-list,filter-list等在R1上指定单个对等体入站的路由策略R1(config)#access-list10denyanyR1(config)#routerbgp1234R1(config-router)#neig

16、hbor20.20.20.20distribute-list10inR1#cleaipbgp*sR1#shoipbgpBGPtableversionis7,localrouterIDis1.1.1.1Statuscodes:ssuppressed,ddamped,hhistory,*valid,>best,i-internal,Network*>1.1.1.0/24*>i3.3.3.0/24*>i4.4.4.0/24*>5.5.5.0/24NextHop0.0.0.030.30.30.3040.40.40.4015.1.1.5MetricLocPrfWeightP

17、ath000032768i1000i1000irRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteOrigincodes:i-IGP,e1) 发现命令可以生效，R1的BGP表中已经过滤了来自R2的所有信息。可以对单个对等体成员定义入站的路由策略（验证了distribute-list）如果对整个对等体组定义的入站路由策略和对单个对等体组成员定义的入站路由策略同时存在？继续上面的配置来做：R1(config)#routerbgp1234R1(config-router)#noneighbor20.20.20.20distribute-lis

18、t10inR1(config-router)#neighbor2-4distribute-list10inR1#cleaipbgp*sR1#showipbgpBGPtableversionis9,localrouterIDis1.1.1.1Statuscodes:ssuppressed,ddamped,hhistory,*valid,>best,i-internal,rRIB-failure,SStaleOrigincodes:i-IGP,e-EGP,?-incompleteNetworkNextHopMetricLocPrfWeightPath*>1.1.1.0/240.0.0.0032768i*>5.5.5.0/2415.1.1.5005i从BGP表中可以看到，对整个对等体组定义的入站路由策略已经生效R1(config)#access-list20permit2.2.2.0R1(config)#routerbgp1234R1(config-router)#neighbor20.20.20.20distribute-list20inR1#cleaipbgp*sR1#showipbgpBGPtableversionis4,localrouterIDis1.1.1.1Statuscodes:ssuppressed,ddamped,hhistory