R1 R2两台同型号路由器建立OSPF，为什么R1成了DR？

giao里giao

如图两台路由器配置及连接情况，已完成ospf的配置，且两端可正常发现ospf路由，但是在抓包过程发现R1被选为DR，R2为BDR，这是什么原因？不应该R2是DR吗？接口优先级相同

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