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Logging in through modems
Introduction
The administrator can use two modems to remotely maintain a switch through its Console port over the
Public Switched Telephone Network (PSTN) when the IP network connection is broken.
This section includes these topics:
• Configuration requirements
• Login procedure
• Modem login authentication modes
• Configuring none authentication for modem login
• Configuring password authentication for modem login
• Configuring scheme authentication for modem login
• Configuring common settings for modem login (optional)
Configuration requirements
By default, no authentication is needed when you log in through modems, and the default user privilege
level is 3.
To use this method, perform necessary configurations on both the device side and administrator side.
The following table shows the remote login configuration requirements through the console port by using
modem dial-in:
Object Requirement
The PC is correctly connected to the modem.
The modem is connected to a telephone cable that works properly.
Administrator side
The telephone number of the remote modem connected to the console port of the
remote switch is obtained.
The console port is correctly connected to the modem.
Configurations have been configured on the modem.
The modem is connected to a telephone cable that works properly.
Device side
Authentication configuration has been completed on the remote switch.
Login procedure
Step1 Set up a configuration environment as shown in Figure 19: connect the serial port of the PC and the
console port of the device to a modem respectively.
Figure 19 Set up a configuration terminal
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