IBGP路由反射器的设置

一、各路由的配置如下：

R1：

#
interface GigabitEthernet0/0/0
 ip address 192.168.10.1 255.255.255.0 
#
interface GigabitEthernet0/0/1
#
interface GigabitEthernet0/0/2
#
interface NULL0
#
interface LoopBack0
 ip address 1.1.1.1 255.255.255.0 
#
bgp 100
 router-id 1.1.1.1
 peer 192.168.10.2 as-number 100 
 #
 ipv4-family unicast
  undo synchronization
  network 1.1.1.0 255.255.255.0 
  peer 192.168.10.2 enable
#
return

R2：

#
interface GigabitEthernet0/0/0
 ip address 192.168.10.2 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 192.168.20.1 255.255.255.0 
#
interface GigabitEthernet0/0/2
#
interface NULL0
#
interface LoopBack0
 ip address 2.2.2.2 255.255.255.0 
#
bgp 100
 router-id 2.2.2.2
 group test1 internal
 peer 192.168.10.1 as-number 100 
 peer 192.168.10.1 group test1 
 peer 192.168.20.2 as-number 100 
 peer 192.168.20.2 group test1 
 #
 ipv4-family unicast
  undo synchronization
  network 2.2.2.0 255.255.255.0 
  network 192.168.10.0 
  network 192.168.20.0 
  peer test1 enable
  peer test1 reflect-client
  peer 192.168.10.1 enable
  peer 192.168.10.1 group test1 
  peer 192.168.20.2 enable
  peer 192.168.20.2 group test1 
#
return
<Huawei>

R3：

interface GigabitEthernet0/0/0
 ip address 192.168.20.2 255.255.255.0 
#
interface GigabitEthernet0/0/1
#
interface GigabitEthernet0/0/2
#
interface NULL0
#
interface LoopBack0
 ip address 3.3.3.3 255.255.255.0 
#
bgp 100
 router-id 3.3.3.3
 peer 192.168.20.1 as-number 100 
 #
 ipv4-family unicast
  undo synchronization
  network 3.3.3.0 255.255.255.0 
  peer 192.168.20.1 enable
#
return

注意事项：

1、BGP路由生效的第一个条件是next_hop必须可达，否则无法生成相应的目标路由条目。如下图，当R1无法路由到192.168.20.0网络时，3.3.3.0网络的路由无法被选用：

添加相应的路由后：