BGP路由黑洞（bgp的路由黑洞）

BGP路由黑洞（bgp的路由黑洞）

AR1配置： bgp 10 router-id 10.0.1.1 peer 10.0.12.2 as-number 20 ipv4-family unicast undo synchronization network 10.0.1.1 255.255.255.255 network 10.0.12.0 255.255.255.0 peer 10.0.12.2 enable

配置next-hop-local原因是:IBGP从EBGP学习到路由下一跳不变，会导致下一跳不可达，所以IBGP配置local，告知下一跳是自己。

AR2: bgp 20 router-id 10.0.2.2 peer 10.0.4.4 as-number 20 peer 10.0.4.4 connect-interface LoopBack0 peer 10.0.12.1 as-number 10 ipv4-family unicast undo synchronization peer 10.0.4.4 enable peer 10.0.4.4 next-hop-local peer 10.0.12.1 enable

AR4: bgp 20 router-id 10.0.4.4 peer 10.0.2.2 as-number 20 peer 10.0.2.2 connect-interface LoopBack0 peer 10.0.45.5 as-number 30 ipv4-family unicast undo synchronization peer 10.0.2.2 enable peer 10.0.2.2 next-hop-local peer 10.0.45.5 enable

AR5: bgp 30 router-id 10.0.5.5 peer 10.0.45.4 as-number 20 ipv4-family unicast undo synchronization network 10.0.5.5 255.255.255.255 network 10.0.45.0 255.255.255.0 peer 10.0.45.4 enable

AR2，AR3，AR4配置OSPF 1

ospf 1 router-id 10.0.0.2 area 0.0.0.0 network 10.0.2.2 0.0.0.0 network 10.0.23.0 0.0.0.255 ospf 1 router-id 10.0.0.3 area 0.0.0.0 network 10.0.3.3 0.0.0.0 network 10.0.23.0 0.0.0.255 network 10.0.34.0 0.0.0.255 ospf 1 router-id 10.0.0.4 area 0.0.0.0 network 10.0.4.4 0.0.0.0 network 10.0.34.0 0.0.0.255

根据BGP第四条选路原则，当IBGP学到的路由传递给BGP邻居之前通过IGP必须知道该路由，也就是说，AR2学习到的AR1的的路由传递给AR4时，改路由经过AR3，AR3必须知道AR1的路由；同理也必须知道AR5的路由，可以通过IBGP全互联和OSPF 引入BGP解决此问题； 办法1 ospf引入bgp(如果是公网bgp，不建议这么搞，除非你路由器和运维能力很牛逼)：

AR2和AR4分别：bgp 20import-route bgp

办法2 IBGP全互联：

AR2： bgp 20 router-id 10.0.2.2 peer 10.0.3.3 as-number 20 peer 10.0.3.3 connect-interface LoopBack0 peer 10.0.4.4 as-number 20 peer 10.0.4.4 connect-interface LoopBack0 ipv4-family unicast undo synchronization peer 10.0.3.3 enable peer 10.0.3.3 next-hop-local peer 10.0.4.4 enable peer 10.0.4.4 next-hop-local AR3： bgp 20 router-id 10.0.3.3 peer 10.0.2.2 as-number 20 peer 10.0.2.2 connect-interface LoopBack0 peer 10.0.4.4 as-number 20 peer 10.0.4.4 connect-interface LoopBack0 ipv4-family unicast undo synchronization peer 10.0.2.2 enable peer 10.0.4.4 enable AR4：bgp 20 router-id 10.0.4.4 peer 10.0.2.2 as-number 20 peer 10.0.2.2 connect-interface LoopBack0 peer 10.0.3.3 as-number 20 peer 10.0.3.3 connect-interface LoopBack0 ipv4-family unicast undo synchronization peer 10.0.2.2 enable peer 10.0.2.2 next-hop-local peer 10.0.3.3 enable peer 10.0.3.3 next-hop-local

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