NO.140 在 Router1 和 RouLer3 之间创建 GRE 隧道,三台路由器配置命令分别为:
Router1 :
[Router1] interface Serial 0/2/0
[Router1-Serial0/2/0] ip address 10.1.1.1 24
ERouter1] interface loopback 0
[Router1-LoopBackO] ip address 1.1.1.1 32
[Router1] interface Tunnel 0
[Router1-Tunnel0] source 10.1.1.1
[Router1-Tunnel0] destination 20.1.1.2
[Router1-TunnelO] ip address 100.1.1.1 24
[Router1] ospf
[Router1-ospf-1] area 0
[Router1-ospf-1-area-0.0.0.0] network 10.1.1.1 0.0.0.255
[Router1] ip route-static 3.3.3.3 32 100.1.1.2
Router2 :
[Router2] interface Serial 0/2/0
[Router2-Serial0/2/0] ip address 10.1.1.2 24
[Router2] interface Serial 0/2/1
[Router2-Serial0/2/0] ip address 20.1.1.1 24
[Router2] ospf
IRouter1-ospf-1] area 0
[Router1-ospf-1-area-0.0.0.0] network 10.1.1.2 0.0.0.255
[Router1-ospf-1-area-0.0.0.0] network 20.1.1.1 0.0.0.255
Router3 :
[Router3] interface Serial 0/2/0
[Router3-Serial0/2/O] ip address 20.1.1.2 24
[Router3] interface loopback 0
[Router3-LoopBackO] ip address 3.3.3.3 32
[Router3] interface Tunnel 0
[Router3-TunnelO] source 20.1.1.2
[Router3-TunnelO] destination 1 0.1.1.1
[Router3-TunnelO] ip address 100.1.1.2
[Router3] ospf
[Router3-ospf-l] area 0
[Router3-ospf-l-area-0.0.0.0] network 20.1.1.2 0.0.0.255
[Router3] ip route-static l.1.1.1 32 100.1.1.1
在 Router1 上使用命令 ping-a 1.1.1.1 3.3.3.3 ,检查连通性, 100% 收到 ICMP 回包。
上述过程中,以下对各路由器对数据包的处理过程的描述,正确的是。(选择一项或多项)