Cisco OSPF 路由器类型详细说明

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OSPF Router Types: Detailed Explanation

OSPF ROUTER TYPES

OSPF 路由器类型

OSPF routers control the traffic that goes traverses across the area boundary. The OSPF routers are categorized based on the function they perform in the routing domain.
OSPF 路由器控制穿越区域边界的流量。OSPF 路由器根据它们在路由域中执行的功能进行分类。

There are four different types of OSPF routers:
OSPF路由器有四种不同类型：

Internal Router –

内部路由器 –

This is a router that has all of its interfaces in the same area. All internal routers in an area have identical LSDBs.
这是一个路由器，其所有接口都位于同一区域。区域中的所有内部路由器都具有相同的 LSDB。

Backbone Router –

骨干路由器 –

This is a router which resides in backbone area. The backbone area is set to area 0.
这是位于骨干区域的路由器。主干区域设置为区域 0。

Area Border Router (ABR) –

区域边界路由器（ABR） –

This is a router that has interfaces attached to 2 or more areas. It can route between areas. ABRs are exit points for the area, which means that routing information destined for another area can get there only via the ABR of the local area. ABRs can be configured to summarize the routing information from the LSDBs of their attached areas. ABRs distribute the routing information into the backbone. In a multi-area network, an area can have one or more ABRs.
此路由器其接口连接到两个或更多区域。它可以在区域之间路由。ABR 是该区域的出口点，发往另一个区域的路由信息只能通过本地区域的 ABR 到达那里。ABR 可以配置为汇总来自其连接区域的 LSDB 的路由信息。ABR 将路由信息分发到主干网中。在多区域网络中，一个区域可以有一个或多个 ABR。

Autonomous System Boundary Router (ASBR) –

自治系统边界路由器（ASBR） –

This is a router that has at least one interface attached to external network (other autonomous system), such as a non-OSPF network. An ASBR can import non-OSPF network information to the OSPF network using route redistribution.
这是一种路由器，其至少有一个接口连接到外部网络（其他自治系统），例如非 OSPF 网络。ASBR可以使用路由重新分发将非OSPF网络信息导入OSPF网络。

Notable is that a router can be performing 2 functions. For example, if a router connects to area 0 and area 1, and in addition, maintains routing information for external network, it will be called more than one router type namely –
值得注意的是，路由器可以执行 2 个功能。例如，如果路由器连接到区域 0 和区域 1，并且此外还维护外部网络的路由信息，则它将被称为多个路由器类型，即 –