<R1>
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
The number of interface that is UP in Physical is 2
The number of interface that is DOWN in Physical is 2
The number of interface that is UP in Protocol is 2
The number of interface that is DOWN in Protocol is 2
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 12.1.1.1/24 up up
GigabitEthernet0/0/1 unassigned down down
GigabitEthernet0/0/2 unassigned down down
NULL0 unassigned up up(s)
display ip interface brief
R1的IP地址配置正确
client
.3
R3
R1
.1
client
client1
SSH server
R2
.2
FTP服务器
.1
GE 0/0/0
Ethernet 0/0/0
GE 0/0/0
GE 0/0/0
GE 0/0/1
Ethernet 0/0/4
Ethernet 0/0/1
Ethernet 0/0/2Ethernet 0/0/3
Ethernet 0/0/0
12.1.1.0/24
12.2.1.0/24
1.1 排查路由器IP地址配置错误