默认路由配置与路由表

Router(config)#ip route 0.0.0.0 0.0.0.0 172.99.255.254

注明：数据包在匹配所有明确路由后，才会匹配默认路由，也就是最后才会匹配默认路由。

查看路由信息：

Router#show ip route (Router#show ip route {static|address} {查看静态路由|查看某IP如何被转发) )

Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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 10.10.10.1 to network 0.0.0.0
C 10.0.0.0/8 is directly connected, FastEthernet0/1 (直连路由)
C 172.28.0.0/16 is directly connected, FastEthernet0/0
S 200.200.200.0/24 [1/0] via 172.28.12.2 (静态理由)
S* 0.0.0.0/0 [1/0] via 10.10.10.1 (默认路由)