How to connect to switch or router

There are three ways to connect to router or switch.

  • Using console port
  • Using Telnet over network
  • Using auxiliary port


Use rolled cable to connect serial port from your computer to console port of router/switch. Cable is normally light blue.

Use terminal program (as Putty) to access to router/switch. First must be configured appropriate COM port for connection and connection parameters (9600 bps, 8 data bits, none parity , 1 stop bit, none flow control). Communication will work if password for console port is not enabled.



Router or Switch must have at least one active IP address, reachable over network. Brand new or equipment with factory settings can not be accessed on this way. Also, some procedures, as deleting unknown password, can not be done on this way. Telnet access must be enabled on equipment. If password is not set, it will be rejected.

Use terminal program or access using command line (in DOS / Windows command line is telnet), then configure IP address and start communication answering on password.


PC>telnet – connecting to equipment on IP address

Trying …Open

User Access Verification

Password: – enter password

Router> – session established

AUX port

For getting dial-in access to the router, you will need to connect a modem to the AUX port of the router using Cisco AUX cable. Then you will need to connect a telephone line to this modem. Once this is done, you can use any utility like Hyper Terminal to dial the number of the phone line and get console access to the router remotely. Cable type depends of used equipment, RJ-45 rolled or RS 232 /RJ-45 Rolled. Normally should be delivered with router / switch, and it is black.