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Setting Up Console Connections to Cisco Devices


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Interconnecting Cisco Network Devices

From: Interconnecting Cisco Network Devices
Author: Stephen McQuerry
Publisher: Cisco Press (53)
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Setting Up Console Connections to Cisco Devices

In order to initially configure your Cisco device, you will need to provide a management connection directly to the device. For Cisco equipment, this management attachment is called a console port. The console port allows you to monitor and configure a Cisco hub, switch, or router.

The cable used between a terminal and a console port is a rollover cable with RJ-45 connectors, as illustrated in Figure 2-17.

Figure 2-17. Connecting a Device with a Console Cable


Not all Cisco devices use a rollover cable to connect a console port to a PC. The rollover cable is the most common and is used for the routers and switches that this book focuses on (that is, 1600, 2500, 2600, and 3600 series routers and 1900 and 2820 switches). If you have a different device, please check your documentation for console connectivity requirements.

A rollover cable has a different pinout than the straight-through or crossover RJ-45 cables used with Ethernet or ISDN BRI. The pinout for a rollover is as follows:

  • 1—8

  • 2—7

  • 3—6

  • 4—5

  • 5—4

  • 6—3

  • 7—2

  • 8—1

To set up the connection between your terminal and the Cisco console port, you must do the following:

  1. Cable the device using a rollover cable. You may need an RJ-45-to-DB-9 or an RJ-45-to-DB-25 adapter for your PC or terminal.

  2. Configure terminal emulation application with the following COM port settings: 9600 bps, 8 data bits, no parity, 1 stop bit, and no flow control. This provides out-of-band console access.


The AUX port provided on some devices can be used to provide out-of-band management via a modem. The AUX port must be configured using the console port before it can be used. The AUX port also uses the settings of 9600 bps, 8 data bits, no parity, and 1 stop bit. The speed of this port can be set as high as 15,200 bps on some devices. The AUX port can be used for various other functions, including data transfer for dial-on-demand-routing.


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