使用eNSP搭建實驗環境：

1）確保設備之間的連通性

2）配置BGP

3）配置RR

實現此案例需要按照如下步驟進行。

//R1的基本配置interface gi0/0/0 ip address 192.168.12.1 255.255.255.0 interface gi0/0/1 ip address 192.168.1.254 255.255.255.0 interface loopback 13ip address 10.10.1.1 255.255.255.0 ospf 1 router-id 1.1.1.1area 0 network 192.168.12.0 0.0.0.255network 10.10.1.1 0.0.0.0 //R2的基本配置interface gi0/0/1 ip address 192.168.12.2 255.255.255.0interface gi0/0/0 ip address 192.168.23.2 255.255.255.0 interface loopback 0ip address 10.10.2.2 255.255.255.0 ospf 1 router-id 2.2.2.2area 0 network 192.168.12.2 0.0.0.0 network 192.168.23.2 0.0.0.0 network 10.10.2.2 0.0.0.0 //R3的基本配置interface gi0/0/1 ip address 192.168.23.3 255.255.255.0 interface gi0/0/2 ip address 192.168.2.254 255.255.255.0 interface loopback 13ip address 10.10.3.3 255.255.255.0 ospf 1 router-id 3.3.3.3area 0 network 192.168.23.3 0.0.0.0network 10.10.3.3 0.0.0.0 //R1的配置bgp 64512router-id 1.1.1.1peer 10.10.2.2 as-number 64512peer 10.10.2.2 connect-interface loopback 13import-route direct //R2的配置bgp 64512router-id 2.2.2.2peer 10.10.1.1 as-number 64512peer 10.10.1.1 connect-interface loopback 0 peer 10.10.3.3 as-number 64512peer 10.10.3.3 connect-interface loopback 0 //R3的配置bgp 64512router-id 3.3.3.3peer 10.10.2.2 as-number 64512peer 10.10.2.2 connect-interface loopback 13network 192.168.2.0 255.255.255.0 //查看R1的路由表<Huawei>dis bgp roBGP Local router ID is 1.1.1.1 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 8Network NextHop MED LocPrf PrefVal Path/Ogn*> 10.10.1.0/24 0.0.0.0 0 0 ?*> 10.10.1.1/32 0.0.0.0 0 0 ?*> 127.0.0.0 0.0.0.0 0 0 ?*> 127.0.0.1/32 0.0.0.0 0 0 ?*> 192.168.1.0 0.0.0.0 0 0 ?*> 192.168.1.254/32 0.0.0.0 0 0 ?*> 192.168.12.0 0.0.0.0 0 0 ?*> 192.168.12.1/32 0.0.0.0 0 0 ? <Huawei>dis ip ro Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: PublicDestinations : 16 Routes : 16 Destination/Mask Proto Pre Cost Flags NextHop Interface10.10.1.0/24 Direct 0 0 D 10.10.1.1 LoopBack1310.10.1.1/32 Direct 0 0 D 127.0.0.1 LoopBack1310.10.1.255/32 Direct 0 0 D 127.0.0.1 LoopBack1310.10.2.2/32 OSPF 10 1 D 192.168.12.2 GigabitEthernet 0/0/010.10.3.3/32 OSPF 10 2 D 192.168.12.2 GigabitEthernet 0/0/0127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0192.168.1.0/24 Direct 0 0 D 192.168.1.254 GigabitEthernet 0/0/1192.168.1.254/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.1.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.12.0/24 Direct 0 0 D 192.168.12.1 GigabitEthernet 0/0/0192.168.12.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0192.168.12.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0192.168.23.0/24 OSPF 10 2 D 192.168.12.2 GigabitEthernet 0/0/0 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0 //查看R2的路由表 <Huawei>dis bgp roBGP Local router ID is 2.2.2.2 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 4Network NextHop MED LocPrf PrefVal Path/Ogn*>i 10.10.1.0/24 10.10.1.1 0 100 0 ?*>i 192.168.1.0 10.10.1.1 0 100 0 ?*>i 192.168.2.0 10.10.3.3 0 100 0 i*>i 192.168.12.0 10.10.1.1 0 100 0 ? <Huawei>dis ip ro Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: PublicDestinations : 18 Routes : 18 Destination/Mask Proto Pre Cost Flags NextHop Interface10.10.1.0/24 IBGP 255 0 RD 10.10.1.1 GigabitEthernet 0/0/110.10.1.1/32 OSPF 10 1 D 192.168.12.1 GigabitEthernet 0/0/110.10.2.0/24 Direct 0 0 D 10.10.2.2 LoopBack010.10.2.2/32 Direct 0 0 D 127.0.0.1 LoopBack010.10.2.255/32 Direct 0 0 D 127.0.0.1 LoopBack010.10.3.3/32 OSPF 10 1 D 192.168.23.3 GigabitEthernet 0/0/0127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0192.168.1.0/24 IBGP 255 0 RD 10.10.1.1 GigabitEthernet 0/0/1192.168.2.0/24 IBGP 255 0 RD 10.10.3.3 GigabitEthernet 0/0/0192.168.12.0/24 Direct 0 0 D 192.168.12.2 GigabitEthernet 0/0/1192.168.12.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.12.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.23.0/24 Direct 0 0 D 192.168.23.2 GigabitEthernet 0/0/0192.168.23.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0192.168.23.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0 //查看R3的路由表 <Huawei>dis bgp roBGP Local router ID is 3.3.3.3 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 1Network NextHop MED LocPrf PrefVal Path/Ogn*> 192.168.2.0 0.0.0.0 0 0 i <Huawei>dis ip ro Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: PublicDestinations : 16 Routes : 16 Destination/Mask Proto Pre Cost Flags NextHop Interface10.10.1.1/32 OSPF 10 2 D 192.168.23.2 GigabitEthernet 0/0/110.10.2.2/32 OSPF 10 1 D 192.168.23.2 GigabitEthernet 0/0/110.10.3.0/24 Direct 0 0 D 10.10.3.3 LoopBack1310.10.3.3/32 Direct 0 0 D 127.0.0.1 LoopBack1310.10.3.255/32 Direct 0 0 D 127.0.0.1 LoopBack13127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0192.168.2.0/24 Direct 0 0 D 192.168.2.254 GigabitEthernet 0/0/2192.168.2.254/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/2192.168.2.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/2192.168.12.0/24 OSPF 10 2 D 192.168.23.2 GigabitEthernet 0/0/1192.168.23.0/24 Direct 0 0 D 192.168.23.3 GigabitEthernet 0/0/1192.168.23.3/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.23.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0 可以看到，由于IBGP 遵守水平分割規則，R2不能將學習到的路由互相轉發，造成R1與R3不能學習到對方的路由。 PC1與PC2不能ping通。//R2的配置 bgp 64512 //將10.10.1.1配置成了路由反射器客戶端，同時自己成為了路由反射器peer 10.10.1.1 reflect-client //將10.10.3.3配置成了路由反射器客戶端peer 10.10.3.3 reflect-client //查看R1的路由表 <Huawei>dis bgp roBGP Local router ID is 1.1.1.1 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 9Network NextHop MED LocPrf PrefVal Path/Ogn*> 10.10.1.0/24 0.0.0.0 0 0 ?*> 10.10.1.1/32 0.0.0.0 0 0 ?*> 127.0.0.0 0.0.0.0 0 0 ?*> 127.0.0.1/32 0.0.0.0 0 0 ?*> 192.168.1.0 0.0.0.0 0 0 ?*> 192.168.1.254/32 0.0.0.0 0 0 ?*>i 192.168.2.0 10.10.3.3 0 100 0 i*> 192.168.12.0 0.0.0.0 0 0 ?*> 192.168.12.1/32 0.0.0.0 0 0 ? <Huawei>dis ip ro Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: PublicDestinations : 17 Routes : 17 Destination/Mask Proto Pre Cost Flags NextHop Interface10.10.1.0/24 Direct 0 0 D 10.10.1.1 LoopBack1310.10.1.1/32 Direct 0 0 D 127.0.0.1 LoopBack1310.10.1.255/32 Direct 0 0 D 127.0.0.1 LoopBack1310.10.2.2/32 OSPF 10 1 D 192.168.12.2 GigabitEthernet 0/0/010.10.3.3/32 OSPF 10 2 D 192.168.12.2 GigabitEthernet 0/0/0127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0192.168.1.0/24 Direct 0 0 D 192.168.1.254 GigabitEthernet 0/0/1192.168.1.254/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.1.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.2.0/24 IBGP 255 0 RD 10.10.3.3 GigabitEthernet 0/0/0192.168.12.0/24 Direct 0 0 D 192.168.12.1 GigabitEthernet 0/0/0192.168.12.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0192.168.12.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0192.168.23.0/24 OSPF 10 2 D 192.168.12.2 GigabitEthernet 0/0/0 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0 //查看R2的路由表 <Huawei>dis bgp roBGP Local router ID is 2.2.2.2 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 4Network NextHop MED LocPrf PrefVal Path/Ogn*>i 10.10.1.0/24 10.10.1.1 0 100 0 ?*>i 192.168.1.0 10.10.1.1 0 100 0 ?*>i 192.168.2.0 10.10.3.3 0 100 0 i*>i 192.168.12.0 10.10.1.1 0 100 0 ? <Huawei>dis ip ro Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: PublicDestinations : 18 Routes : 18 Destination/Mask Proto Pre Cost Flags NextHop Interface10.10.1.0/24 IBGP 255 0 RD 10.10.1.1 GigabitEthernet 0/0/110.10.1.1/32 OSPF 10 1 D 192.168.12.1 GigabitEthernet 0/0/110.10.2.0/24 Direct 0 0 D 10.10.2.2 LoopBack010.10.2.2/32 Direct 0 0 D 127.0.0.1 LoopBack010.10.2.255/32 Direct 0 0 D 127.0.0.1 LoopBack010.10.3.3/32 OSPF 10 1 D 192.168.23.3 GigabitEthernet 0/0/0127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0192.168.1.0/24 IBGP 255 0 RD 10.10.1.1 GigabitEthernet 0/0/1192.168.2.0/24 IBGP 255 0 RD 10.10.3.3 GigabitEthernet 0/0/0192.168.12.0/24 Direct 0 0 D 192.168.12.2 GigabitEthernet 0/0/1192.168.12.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.12.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.23.0/24 Direct 0 0 D 192.168.23.2 GigabitEthernet 0/0/0192.168.23.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0192.168.23.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/0 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0 //查看R3的路由表 <Huawei>dis bgp roBGP Local router ID is 3.3.3.3 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 4Network NextHop MED LocPrf PrefVal Path/Ogn*>i 10.10.1.0/24 10.10.1.1 0 100 0 ?*>i 192.168.1.0 10.10.1.1 0 100 0 ?*> 192.168.2.0 0.0.0.0 0 0 i*>i 192.168.12.0 10.10.1.1 0 100 0 ? <Huawei>dis ip ro Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: PublicDestinations : 18 Routes : 18 Destination/Mask Proto Pre Cost Flags NextHop Interface10.10.1.0/24 IBGP 255 0 RD 10.10.1.1 GigabitEthernet 0/0/110.10.1.1/32 OSPF 10 2 D 192.168.23.2 GigabitEthernet 0/0/110.10.2.2/32 OSPF 10 1 D 192.168.23.2 GigabitEthernet 0/0/110.10.3.0/24 Direct 0 0 D 10.10.3.3 LoopBack1310.10.3.3/32 Direct 0 0 D 127.0.0.1 LoopBack1310.10.3.255/32 Direct 0 0 D 127.0.0.1 LoopBack13127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0192.168.1.0/24 IBGP 255 0 RD 10.10.1.1 GigabitEthernet 0/0/1192.168.2.0/24 Direct 0 0 D 192.168.2.254 GigabitEthernet 0/0/2192.168.2.254/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/2192.168.2.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/2192.168.12.0/24 OSPF 10 2 D 192.168.23.2 GigabitEthernet 0/0/1192.168.23.0/24 Direct 0 0 D 192.168.23.3 GigabitEthernet 0/0/1192.168.23.3/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1192.168.23.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet 0/0/1 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0 可以看到，路由反射器將從客戶處學到的路由轉發給除此客戶外的所有的客戶，R1與R3可以學習到對方的路由。 PC1與PC2可以ping通。

總結

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