{"id":155,"date":"2012-03-29T13:17:35","date_gmt":"2012-03-29T11:17:35","guid":{"rendered":"https:\/\/blog.4-it.net\/?p=155"},"modified":"2012-03-29T13:17:35","modified_gmt":"2012-03-29T11:17:35","slug":"software-upgrade-procedure","status":"publish","type":"post","link":"https:\/\/blog.4-it.net\/?p=155","title":{"rendered":"Software Upgrade Procedure"},"content":{"rendered":"

<\/a>Prerequisites<\/h2>\n

<\/a>Requirements<\/h3>\n

There are no specific requirements for this document.<\/p>\n

<\/a>Components Used<\/h3>\n

The information in this document is based on the Cisco IOS Software Release 12.0 or later.<\/p>\n

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.<\/p>\n

<\/a>Conventions<\/h3>\n

Refer to the Cisco Technical Tips Conventions<\/a> for more information on document conventions.<\/p>\n

<\/a>Background Information<\/h2>\n

Several protocols are available to copy the Cisco IOS image into the Cisco routers. The most commonly used protocol is TFTP. Other protocols include ftp, http, https, scp, and rcp. If necessary, you can copy an image from one device to another. For more information, refer to the Copying From One Router to Another<\/em> section of the How To Copy a System Image from One Device to Another<\/a> document.<\/p>\n

This section describes how to install a TFTP server, how to establish a console session with the router, and the router boot problems.<\/p>\n

<\/a>Install a TFTP Server<\/h3>\n

A Trivial File Transfer Protocol (TFTP) server application must be installed on a TCP\/IP-ready workstation or PC. After the application is installed, you must perform a minimal level of configuration.<\/p>\n

    \n
  1. Download a TFTP server. Refer to TFTP Server Selection and Use<\/a> for more information.<\/li>\n
  2. Configure the TFTP application to operate as a TFTP server<\/em> instead of a TFTP client<\/em>.<\/li>\n
  3. Specify the outbound file directory. This is the directory in which the Cisco IOS software images are stored. Most TFTP applications provide a setup routine in order to assist in these configuration tasks.<\/li>\n<\/ol>\n

    <\/a>Establish a Console Session with the Router<\/h3>\n

    Even if it is possible to connect to the router through a Telnet session, Cisco recommends that you connect directly to the router through the console port because, if something goes wrong during the upgrade, you might need to be physically present next to the router to power-cycle it. Moreover, the Telnet connection is lost while the router reboots during the upgrade procedure.<\/p>\n

    A rolled cable, usually a flat black cable, connects the console port of the router to one of the COM ports of the PC.<\/p>\n

    When the PC is connected to the console port of the router, open HyperTerminal on the PC, and use these settings:<\/p>\n

    \n
    Speed 9600 bits per second\r\n\r\n     8 databits\r\n\r\n     0 parity bits\r\n\r\n     1 stop bit\r\n\r\n     No Flow Control<\/pre>\n<\/blockquote>\n
    If garbage characters appear in the HyperTerminal session, either you have not set the HyperTerminal properties properly or the config-register of the router is set to a non-standard value for which the console connection speed is higher than 9600 bps. In order to check the value of the config-register, issue the show version<\/strong> command. The config-register values appears in the last line of the output. Verify that this value is set to 0x2102 or 0x102.<\/p>\n
    Note:\u00a0<\/strong>In order for a configuration register change to take effect, you must reload the router.<\/p>\n
    When you are sure that the console speed is set to 9600 bps on the router side, you should check the HyperTerminal properties. Refer to Applying Correct Terminal Emulator Settings for Console Connections<\/a> for more information on how to set the HyperTerminal properties.<\/p>\n
    <\/a>Router Boot Problems<\/h3>\n
    When you are connected to the console port of the router, you might notice that the router is either in ROMmon or Boot mode. These two modes are used for recovery and diagnostic procedures. If you do not see the usual router prompt, you should use these recommendations in order to proceed with the upgrade procedure installation:<\/p>\n