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Peng Hailin 2016-09-18 15:24:04 +08:00
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@ -1362,3 +1362,34 @@ D* 200.10.10.0/24 [90/2172416] via 150.2.2.1, 00:01:03, Serial0/0
150.1.0.0/24 is subnetted, 1 subnets
C 150.1.1.0 is directly connected, Serial0/0
```
`network`命令可用于对某条既有的指向某个物理或逻辑接口，通常是空接口的静态默认路由，进行通告（The `network` command can be used to advertise an existing static default route point to either a physical or a logical interface, typically the Null0 interface）。
> **注意**：`Null0`接口是路由器上的一个虚拟接口，会将路由至该接口的所有流量进行抛弃处理。如有着一条指向`Null0`的静态路由，那么所有以该静态路由中所指定网络为目的的流量，都将被简单地做丢弃处理。可将`Null0`接口看着是一个黑洞：数据包进入了，但不会有任何东西离开那里。其基本上就是路由器上的一个数位垃圾桶（It is essentially a bit-bucket on the router）。
参考上面的图36.12, `network`命令与一条既有默认静态路由的结合使用，在以下路由器R1的配置中进行了演示：
```
R1(config)#ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
R1(config)#router eigrp 150
R1(config-router)#network 0.0.0.0
R1(config-router)#exit
```
基于此种配置，下面的输出，演示了路由器R2上的IP路由表：
```
R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 150.1.1.1 to network 0.0.0.0
D 200.10.10.0/24 [90/2172416] via 150.1.1.1, 00:01:11, Serial0/0
150.1.0.0/24 is subnetted, 1 subnets
C 150.1.1.0 is directly connected, Serial0/0
D* 0.0.0.0/0 [90/2172416] via 150.1.1.1, 00:00:43, Serial0/0
```