OSPF协议将网络划分为多个自治域进行管理，路由器根据在自治系统中的角色划分(IAR,ABR,BBR,ASBR)，除IAR外，一个运行OSPF协议的接口状态根据接口的不同类型可划分为



DR: Designated Router



BDR: Border Designated Router



DROther: Non (DR or BDR)-The OSPF protocol divides the network into several autonomous domains. The router can be divided into IAR, ABR, ASBR, BBR (OSPF), except for IAR.

Designated Router DR:

Border Designated Router BDR:

Non DROther: (or BDR DR)