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路由反射器解决路由黑洞问题

路由黑洞的产生

根据BGP建立邻居的规则，只要TCP可达便可建立邻居系。如下图所示：

• AR2、AR3、AR4之间运行了OSPF，并宣告了23.1.1.0、34.1.1.0网段
• AR2与AR4可以跨跳建立iBGP邻居关系，而在AR3上不配置BGP。
• 在AR1的注入8.8.8.8的路由，AR4注入9.9.9.9的路由
  

<ar1>dis bgp rouBGP 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: 2Network            NextHop        MED        LocPrf    PrefVal Path/Ogn*>   8.8.8.8/32         0.0.0.0         0                     0      i*>   9.9.9.9/32         12.1.1.2                              0      200i--------------------------------------------------------------------------------------------------<ar2>Please check whether system data has been changed, and save data in timeConfiguration console time out, please press any key to log on<ar2>dis bgp rouBGP 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: 2Network            NextHop        MED        LocPrf    PrefVal Path/Ogn*>   8.8.8.8/32         12.1.1.1        0                     0      100i*>i  9.9.9.9/32         4.4.4.4         0          100        0      i-------------------------------------------------------------------------------------------------------
<ar4>dis bgp rouBGP Local router ID is 34.1.1.4 Status codes: * - valid, > - best, d - damped,h - history,  i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 2Network            NextHop        MED        LocPrf    PrefVal Path/Ogn*>i  8.8.8.8/32         2.2.2.2         0          100        0      100i*>   9.9.9.9/32         0.0