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R1#erase startup-config
R1#reload
R1#copy running_config startup-config

show running-config | section/incloud/excloud/begin
erase startup-config　　        删除baiNVRAM中的配置 好象du是这个

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>enable
#config terminal
#hostname Router-A
#line console 0
#password cisco
#login
#line vty 0 15
#password cisco
#login
#enable secret cisco
#service password-encryption
#banner motd "Welcome,haha!"
>enable
#show ip interface brief
#interface gigabitEthernet 0/0
#ip address 192.168.1.1 255.255.255.0
#no shut

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#show controllers
#clock rate 56000
#bandwidth 64

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R1#show ip interface brief
R1#show ip route
R1#show ip protocols
R1#terminal history size 300
R1#show history

R1(config)# interface loopback 0
R1(config-if)# ip address 10.0.0.1 255.255.255.0
R1(config-if)# exit 

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show controllers serial 0/0/0          #查看DTE/DCE,DCE设备,需要配置时钟频率
interface serial 0/0/0
clock rate 64000
show running-config

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route rip
version 2
network 172.16.1.0
network 192.168.1.0

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hostname R1
enable secret class
service password-encryption
security passwords min-length 5
login block-for 180 attempts 3 within 60
banner motd "Unauthorized access to this device is prohibited!"

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line console 0
password cisco
exec-timeout 3
login
exit

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line vty 0 4
password cisco
exec-timeout 3
login
exit

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interface gigabitethernet 0/0/0
description Link to LAN1
ip address 192.168.1.1 255.255.255.0
no shutdown
exit

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interface serial 0/0/0
description Link to R2
ip address 192.168.2.1 255.255.255.0
clock rate 128000
no shutdown
exit