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Daily update. 2017-07-18 17:15:30

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d12-OSPF-Basics.md
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@@ -184,9 +184,9 @@ FastEthernet0/0 is up, line protocol is up
Suppress Hello for 0 neighbor(s)
```
点对多点是**一种非默认OSPF组网类型**。也就是说，此种组网类型必须使用接口配置命令`ip ospf network point-to-point-multicast [non-broadcast]`手动进行配置。默认情况下，该命令默认应用于一个广播型点对多点类型网络的。此默认组网类型允许OSPF采用多播数据包来动态地发现其邻居路由器。此外在广播型点对多点网络类型上，不进行DR/BDR选举（Point-to-Multipoint is **a non-default OSPF network type**. In other words, this network type must be configured manually using the `ip ospf network point-to-multipoint [non-broadcast]` interface configuration command. By default, this command defaults to a Broadcast Point-to-Multipoint network type. This default network type allows OSPF to use Multicast packets to discover its neighbour routers. In addition, there is no DR/BDR election held on Broadcast Point-to-Multipoint network types）。
点对多点是**一种非默认OSPF组网类型**。也就是说，此种组网类型必须使用接口配置命令`ip ospf network point-to-point-multicast [non-broadcast]`手动进行配置。默认情况下，该命令默认应用于一个广播型点对多点类型网络的。此默认组网类型允许OSPF采用多播数据包来动态地发现其邻居路由器。此外在**广播型点对多点网络**类型上，不进行DR/BDR选举（Point-to-Multipoint is **a non-default OSPF network type**. In other words, this network type must be configured manually using the `ip ospf network point-to-multipoint [non-broadcast]` interface configuration command. By default, this command defaults to **a Broadcast Point-to-Multipoint network** type. This default network type allows OSPF to use Multicast packets to discover its neighbour routers. In addition, there is no DR/BDR election held on Broadcast Point-to-Multipoint network types）。
关键字`[non-broadcast]`将该点对多点网络配置为非广播点对多点网络。这样做就要求静态的OSPF邻居配置，因为这样做后OSPF不会使用多播来动态地发现其邻居路由器。此外，这种网络类型不需要为指定网段进行DR及/或BDR选举。此种组网的主要用途，即允许将接收自所有邻居路由器的路由的邻居路由器开销，分配到邻居路由器，而不是使用使用分配给接口的开销作为邻居开销（the primary use of this network type is to allow neighbor costs to be assigned to neighbors instead of using the interface-assigned cost for routes received from all neighbors）。
关键字`[non-broadcast]`将点对多点网络配置为**非广播点对多点网络**。这样做就要求**静态的OSPF邻居配置**，因为此时OSPF不会使用多播来动态地发现其邻居路由器。此外，这种网络类型不要求为指定网段进行DR及/或BDR选举。此种组网的主要用途，即允许分配邻居开销到邻居路由器，而非使用指定给接口的开销，作为那些自所有邻居处收到的路由的开销（The `[non-broadcast]` keyword configures the Point-to-Multipoint network type as **a Non-Broadcast Point-to-Multipoint network**. This requires **static OSPF neighbour configuration**, as OSPF will not use Multicast to discover dynamically its neighbour routers. Additionally, this network type does not require the election of a DR and/or a BDR router for the designated segment. The primary use of this network type is to allow neighbor costs to be assigned to neighbors instead of using the interface-assigned cost for routes received from all neighbors）。
点对多点组网类型，典型地用于部分全通辐射状非广播多路访问（partial-mesh hub-and-spoke Non-Broadcast Multi-Access(NBMA)）网络。尽管如此，此种组网类型也可指定给诸如广播多路访问网络（比如以太网）等的其它类型网络。默认情况下，在点对多点网络上，OSPF每30秒发出一个Hello数据包。默认死亡间隔是Hello间隔的4倍，也就是120秒。