BGP之IBGP水平分割之路由反射（bgp路由反射原则）

BGP之IBGP水平分割之路由反射（bgp路由反射原则）

BGP之IBGP水平分割之路由反射

6.1 问题如图配置IP地址和OSPFAS 234 使用联盟和路由反射，解决路由传递问题AS 100 和 AS 234 配置 EBGP 邻居AS 500 和 AS 234 配置稳定 EBGP 邻居确保 Loopback10和Loopback50互通

配置思路：1.数据传到R1-R2-R3再往下传的时候需要把R3做成路由反射器。-需要配置客户机可以是R2或者是R6或者同时都做成客户机，但是不能都不是客户机。.2.R4不用管如果是出现相应的需要分割情况也按照这个方式进行配置就可以的3.IP 地址OSPF，R2 R3 R6 R4之间BGP邻居关系设置4.R1 直连EBGP设置， R5稳定import模式引入设置4.非直联的使用LOOPBACK接口稳定连接的时候必须使用 [R4-bgp]peer 10.10.6.6 ebgp-max-hop 直连检测机制需要用的命令

R1路由设置

[R1-GigabitEthernet0/0/0]ip add 192.168.12.1 24[R1-GigabitEthernet0/0/0]q[R1]int LoopBack 10[R1-LoopBack10]ip add 10.10.10.10 24[R1-LoopBack10]q[R1]bgp 100[R1-bgp]router-id 1.1.1.1 [R1-bgp]peer 192.168.12.2 as-number 234Warning: Local interface is already configured with this address.[R1-bgp]dis this[V200R003C00]#bgp 100router-id 1.1.1.1peer 192.168.12.2 as-number 234 #ipv4-family unicastundo synchronizationpeer 192.168.12.1 enable#return[R1-bgp]network 10.10.10.0 255.255.255.0[R1-bgp]dis this[V200R003C00]#bgp 100router-id 1.1.1.1peer 192.168.12.1 as-number 234 #ipv4-family unicastundo synchronizationnetwork 10.10.10.0 255.255.255.0 peer 192.168.12.2 enable

R2：R1,R3邻居设置[R2]bgp 64523[R2-bgp]dis this[V200R003C00]#bgp 64523router-id 2.2.2.2confederation id 234confederation peer-as 64544peer 10.10.3.3 as-number 64523 peer 10.10.3.3 connect-interface LoopBack0peer 192.168.12.1 as-number 100 #ipv4-family unicastundo synchronizationpeer 10.10.3.3 enablepeer 10.10.3.3 next-hop-local peer 192.168.12.1 enable#return

R3：R2,R6邻居设置[R3-bgp]peer 10.10.6.6 as-number 64523 [R3-bgp]peer 10.10.6.6 connect-interface LoopBack 0[R3]bgp 64523[R3]dis bgp routing-table peer 10.10.6.6 advertised-routes [R3]bgp 64523

[R3-bgp]peer 10.10.6.6 reflect-client /设置R3到R6的路由反射器[R3-bgp]dis bgp routing-table peer 10.10.6.6 advertised-routes[R3]bgp 64523[R3-bgp]dis this[V200R003C00]#bgp 64523router-id 3.3.3.3confederation id 234confederation peer-as 64544peer 10.10.2.2 as-number 64523 peer 10.10.2.2 connect-interface LoopBack0peer 10.10.6.6 as-number 64523 peer 10.10.6.6 connect-interface LoopBack0#ipv4-family unicastundo synchronizationpeer 10.10.2.2 enablepeer 10.10.6.6 enablepeer 10.10.6.6 reflect-client#return

R6：R3,R4邻居设置

[R6]int g0/0/0[R6-GigabitEthernet0/0/0]ip add 192.168.64.6 24[R6-GigabitEthernet0/0/0]int g0/0/1[R6-GigabitEthernet0/0/1]ip add 192.168.36.6 24[R6-GigabitEthernet0/0/1]q[R6]int LoopBack 0[R6-LoopBack0]ip add 10.10.6.6 32[R6]ospf 1 router-id 6.6.6.6[R6-ospf-1]area 0[R6-ospf-1-area-0.0.0.0]network 192.168.36.0 0.0.0.255[R6-ospf-1-area-0.0.0.0]network 192.168.64.0 0.0.0.255[R6-ospf-1-area-0.0.0.0]network 10.10.6.6 0.0.0.0[R6-ospf-1-area-0.0.0.0]q[R6]bgp 64523[R6-bgp]confederation id 234

[R6-bgp]confederation peer-as 64544

[R6-bgp]router-id 6.6.6.6

[R6-bgp]peer 10.10.3.3 as-number 64523

[R6-bgp]peer 10.10.3.3 connect-interface LoopBack 0

[R6-bgp]peer 10.10.4.4 as-number 64544

[R6-bgp]peer 10.10.4.4 connect-interface LoopBack 0

[R6-bgp]peer 10.10.4.4 ebgp-max-hop dis bgp peer

[R6]bgp 64523[R6-bgp]dis this[V200R003C00]#bgp 64523router-id 6.6.6.6confederation id 234confederation peer-as 64544peer 10.10.3.3 as-number 64523 peer 10.10.3.3 connect-interface LoopBack0peer 10.10.4.4 as-number 64544 peer 10.10.4.4 ebgp-max-hop 255 peer 10.10.4.4 connect-interface LoopBack0#ipv4-family unicastundo synchronizationpeer 10.10.3.3 enablepeer 10.10.4.4 enable#return

R4：R6,R5邻居设置

[R4]bgp 64544[R4-bgp]dis this[V200R003C00]#bgp 64544router-id 4.4.4.4confederation id 234confederation peer-as 64523peer 10.10.5.5 as-number 500 peer 10.10.5.5 ebgp-max-hop 255 peer 10.10.5.5 connect-interface LoopBack0peer 10.10.6.6 as-number 64523 peer 10.10.6.6 ebgp-max-hop 255 peer 10.10.6.6 connect-interface LoopBack0#ipv4-family unicastundo synchronizationpeer 10.10.5.5 enablepeer 10.10.6.6 enablepeer 10.10.6.6 next-hop-local #return

R5的BGP设置

[R5]bgp 500[R5-bgp]dis this[V200R003C00]#bgp 500router-id 5.5.5.5peer 10.10.4.4 as-number 234 peer 10.10.4.4 ebgp-max-hop 255 peer 10.10.4.4 connect-interface LoopBack0#ipv4-family unicastundo synchronizationimport-route directpeer 10.10.4.4 enable#return

6 案例6：BGP路由反射器配置6.1 问题如图配置IP地址和OSPFAS 234 使用联盟和路由反射，解决路由传递问题AS 100 和 AS 234 配置 EBGP 邻居AS 500 和 AS 234 配置稳定 EBGP 邻居确保 Loopback10和Loopback50互通6.2 方案使用eNSP搭建实验环境，如图-6所示。

图-6

6.3 步骤实现此案例需要按照如下步骤进行。

1）配置网络设备- R1

undo terminal monitor system-view [Huawei]sysname R1 [R1]interface GigabitEthernet 0/0/0[R1-GigabitEthernet0/0/0]ip address 192.168.12.1 24[R1-GigabitEthernet0/0/0]quit[R1]interface LoopBack 10[R1-LoopBack10]ip address 10.10.10.10 24[R1-LoopBack10]quit[R1]bgp 100[R1-bgp]router-id 1.1.1.1[R1-bgp]peer 192.168.12.2 as-number 234[R1-bgp]network 10.10.10.0 255.255.255.0[R1-bgp]quit2）配置网络设备R2

undo terminal monitor system-view [Huawei]sysname R2 [R2]interface GigabitEthernet 0/0/0[R2-GigabitEthernet0/0/0]ip address 192.168.23.2 24[R2-GigabitEthernet0/0/0]quit[R2]interface GigabitEthernet 0/0/1[R2-GigabitEthernet0/0/1]ip address 192.168.12.2 24[R2-GigabitEthernet0/0/1]quit[R2]interface LoopBack 0[R2-LoopBack0]ip address 10.10.2.2 32[R2-LoopBack0]quit[R2]ospf 1 router-id 2.2.2.2[R2-ospf-1]area 0 [R2-ospf-1-area-0.0.0.0]network 10.10.2.2 0.0.0.0[R2-ospf-1-area-0.0.0.0]network 192.168.23.0 0.0.0.255[R2-ospf-1-area-0.0.0.0]quit[R2]bgp 64523[R2-bgp]router-id 2.2.2.2 [R2-bgp]confederation id 234[R2-bgp]confederation peer-as 64544[R2-bgp]peer 192.168.12.1 as-number 100[R2-bgp]peer 10.10.3.3 as-number 64523[R2-bgp]peer 10.10.3.3 connect-interface loopback 0[R2-bgp]peer 10.10.3.3 next-hop-local3）配置网络设备R3

undo terminal monitor system-view [Huawei]sysname R3 [R3]interface GigabitEthernet 0/0/1[R3-GigabitEthernet0/0/1]ip address 192.168.23.3 24[R3-GigabitEthernet0/0/1]quit[R3]interface GigabitEthernet 0/0/0[R3-GigabitEthernet0/0/0]ip address 192.168.36.3 24[R3-GigabitEthernet0/0/0]quit[R3]interface LoopBack 0[R3-LoopBack0]ip address 10.10.3.3 32[R3-LoopBack0]quit[R3]ospf 1 router-id 3.3.3.3[R3-ospf-1]area 0 [R3-ospf-1-area-0.0.0.0]network 10.10.3.3 0.0.0.0[R3-ospf-1-area-0.0.0.0]network 192.168.23.0 0.0.0.255[R3-ospf-1-area-0.0.0.0]network 192.168.36.0 0.0.0.255[R3-ospf-1-area-0.0.0.0]quit[R3]bgp 64523[R3-bgp]router-id 3.3.3.3 [R3-bgp]confederation id 234[R3-bgp]confederation peer-as 64544[R3-bgp]peer 10.10.2.2 as-number 64523[R3-bgp]peer 10.10.2.2 connect-interface loopback 0[R3-bgp]peer 10.10.6.6 as-number 64523[R3-bgp]peer 10.10.6.6 connect-interface loopback 0[R3-bgp]peer 10.10.6.6 reflect-client4）配置网络设备 R6

undo terminal monitor system-view [Huawei]sysname R6 [R6]interface GigabitEthernet 0/0/1[R6-GigabitEthernet0/0/1]ip address 192.168.36.6 24[R6-GigabitEthernet0/0/1]quit[R6]interface GigabitEthernet 0/0/0[R6-GigabitEthernet0/0/0]ip address 192.168.46.6 24[R6-GigabitEthernet0/0/0]quit[R6]interface LoopBack 0[R6-LoopBack0]ip address 10.10.6.6 32[R6-LoopBack0]quit[R6]ospf 1 router-id 6.6.6.6[R6-ospf-1]area 0 [R6-ospf-1-area-0.0.0.0]network 10.10.6.6 0.0.0.0[R6-ospf-1-area-0.0.0.0]network 192.168.36.0 0.0.0.255[R6-ospf-1-area-0.0.0.0]network 192.168.46.0 0.0.0.255[R6-ospf-1-area-0.0.0.0]quit[R6]bgp 64523[R6-bgp]router-id 6.6.6.6 [R6-bgp]confederation id 234[R6-bgp]confederation peer-as 64544[R6-bgp]peer 10.10.3.3 as-number 64523[R6-bgp]peer 10.10.3.3 connect-interface loopback 0[R6-bgp]peer 10.10.4.4 as-number 64544[R6-bgp]peer 10.10.4.4 connect-interface loopback 0[R6-bgp]peer 10.10.4.4 ebgp-max-hop5）配置网络设备 R4

undo terminal monitor system-view [Huawei]sysname R4 [R4]interface GigabitEthernet 0/0/1[R4-GigabitEthernet0/0/1]ip address 192.168.46.4 24[R4-GigabitEthernet0/0/1]quit[R4]interface GigabitEthernet 0/0/0[R4-GigabitEthernet0/0/0]ip address 192.168.44.4 24[R4-GigabitEthernet0/0/0]quit[R4]interface GigabitEthernet 0/0/2[R4-GigabitEthernet0/0/2]ip address 192.168.55.4 24[R4-GigabitEthernet0/0/2]quit[R4]interface LoopBack 0[R4-LoopBack0]ip address 10.10.4.4 32[R4-LoopBack0]quit[R4]ospf 1 router-id 4.4.4.4[R4-ospf-1]area 0 [R4-ospf-1-area-0.0.0.0]network 192.168.34.0 0.0.0.255[R4-ospf-1-area-0.0.0.0]network 10.10.4.4 0.0.0.0[R4-ospf-1-area-0.0.0.0]quit[R4]ip route-static 10.10.5.5 32 192.168.44.5[R4]ip route-static 10.10.5.5 32 192.168.55.5[R4]bgp 64544[R4-bgp]router-id 4.4.4.4 [R4-bgp]confederation id 234[R4-bgp]confederation peer-as 64523[R4-bgp]peer 10.10.6.6 as-number 64523[R4-bgp]peer 10.10.6.6 connect-interface loopback 0[R4-bgp]peer 10.10.6.6 next-hop-local[R4-bgp]peer 10.10.6.6 ebgp-max-hop [R4-bgp]peer 10.10.5.5 as-number 500[R4-bgp]peer 10.10.5.5 connect-interface loopback 0[R4-bgp]peer 10.10.5.5 ebgp-max-hop 6）配置网络设备 R5

undo terminal monitor system-view [Huawei]sysname R5 [R5]interface GigabitEthernet 0/0/0[R5-GigabitEthernet0/0/0]ip address 192.168.44.5 24[R5-GigabitEthernet0/0/0]quit[R5]interface GigabitEthernet 0/0/2[R5-GigabitEthernet0/0/2]ip address 192.168.55.5 24[R5-GigabitEthernet0/0/2]quit[R5]interface LoopBack 0[R5-LoopBack0]ip address 10.10.5.5 32[R5-LoopBack0]quit[R5]interface LoopBack 50[R5-LoopBack50]ip address 10.10.50.50 24[R5-LoopBack50]quit[R5]ip route-static 10.10.4.4 32 192.168.44.4[R5]ip route-static 10.10.4.4 32 192.168.55.4[R5]bgp 500[R5-bgp]router-id 5.5.5.5[R5-bgp]peer 10.10.4.4 as-number 234[R5-bgp]peer 10.10.4.4 connect-interface loopback 0[R5-bgp]peer 10.10.4.4 ebgp-max-hop [R5-bgp]import-route direct[R5-bgp]quit7）测试 R1 与 R5 之间的连通性

ping -a 10.10.10.10 10.10.50.50PING 10.10.50.50: 56 data bytes, press CTRL_C to breakReply from 10.10.50.50: bytes=56 Sequence=1 ttl=255 time=30 msReply from 10.10.50.50: bytes=56 Sequence=2 ttl=255 time=20 msReply from 10.10.50.50: bytes=56 Sequence=3 ttl=255 time=10 msReply from 10.10.50.50: bytes=56 Sequence=4 ttl=255 time=30 msReply from 10.10.50.50: bytes=56 Sequence=5 ttl=255 time=10 ms--- 10.10.50.50 ping statistics ---5 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 10/20/30 ms

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