1. CISCO CATALYST (switch), if the user configuration file is not found during initialization, the default settings file is automatically loaded and the switch is initialized to ensure the switch is working properly.
2, CISCO Router (Router) when initializing, if not found "User Configuration" file, the system will automatically enter the "Initialization configuration Mode" (System Configuration Dialog mode, Setup mode, step by the Step config mode), not working!
Switch, router configuration commands are immediately executed after carriage return and take effect immediately. Pay special attention when modifying commands on a running machine.
Router (config) #hostname?
WORD This system ' s network name
To modify the local identity of the current host in configuration mode, for example:
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Router (config) #hostname R11
R11 (config) #
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R11 (config-if) #ip address?
A.B.C.D IP Address
Set the IP address for the current port and enter the port you want to configure before using:
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R11 (config) #interface Ethernet 1
R11 (config-if) #ip address 172.16.1.1 255.255.255.0
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R11>show version
R11#show version to watch iOS versions, equipment working time, related interface list
R11#show Running-config View the currently active configuration, this profile is stored in RAM
R11#show Interfaces Ethernet 1 View Ethernet interface status, working status, etc. ...
R11#show Interfaces Serial 1
View the port status, the first line indicates
Serial1 is administratively down, line protocol are down
The port is not activated using the no shutdown command
Serial1 is down, line protocol are down
1, the other party does not have no shutdown activation port
2, the line is damaged, the interface does not have any connection cable
Serial1 is up, line protocol are down
1, the other side did not configure the same two-layer protocol, serial interface default ENCAPSULATION:HDLC
2, may not configure the clock frequency
3, may not have the correct configuration three-level address (possible)
Serial1 is up,line protocol are up
Interface works fine
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