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How to Upgrade Cisco Catalyst 3550 Switch IOS
If you have a Cisco Catalyst 3550 switch and you want to upgrade its IOS to a newer version, you might be wondering how to do it. In this article, we will show you the steps to upgrade your switch IOS using a TFTP server and a console cable.
Before you start, you will need the following:
A TFTP server software installed on your computer. You can use any free TFTP server software such as SolarWinds TFTP Server, TFTPD32, or PumpKIN.
A console cable to connect your switch to your computer's serial port.
A terminal emulation software such as PuTTY, HyperTerminal, or SecureCRT.
The IOS image file that you want to install on your switch. You can download the IOS image file from Cisco.com if you have a valid service contract. The IOS image file name should have the format c3550-ipservicesk9-mz.122-55.SE8.bin, where c3550 is the switch model, ipservicesk9 is the feature set, mz is the compression type, 122-55.SE8 is the IOS version, and bin is the file extension.
Once you have everything ready, follow these steps:
Connect your switch to your computer using the console cable and launch your terminal emulation software. Configure the serial port settings to match the switch console port settings, which are usually 9600 baud rate, 8 data bits, no parity, 1 stop bit, and no flow control.
Power on your switch and press the Mode button on the front panel until the Stat LED turns amber. This will put your switch in ROMmon mode, which is a minimal operating system that allows you to perform basic maintenance tasks.
At the switch: prompt, enter the following command to set the IP address of your switch: set IP_ADDR 192.168.1.1/255.255.255.0. You can use any IP address that is not used by any other device on your network.
Enter the following command to set the IP address of your TFTP server: set IP_DEFAULT_GATEWAY 192.168.1.2. You can use any IP address that is assigned to your computer that runs the TFTP server software.
Enter the following command to set the name of the IOS image file that you want to install: set TFTP_FILE c3550-ipservicesk9-mz.122-55.SE8.bin. Make sure that you use the exact file name that you downloaded from Cisco.com.
Enter the following command to start the IOS image transfer from your TFTP server to your switch: tftpdnld. This will take some time depending on the size of the IOS image file and the speed of your network connection.
When the transfer is complete, enter the following command to verify that the IOS image file is valid: verify flash:c3550-ipservicesk9-mz.122-55.SE8.bin. This will check the checksum of the file and compare it with the one provided by Cisco.com. If they match, then the file is not corrupted.
Enter the following command to boot your switch from the new IOS image file: boot flash:c3550-ipservicesk9-mz.122-55.SE8.bin. This will load the IOS into memory and start the switch operation.
After the switch boots up, enter privileged EXEC mode by typing enable and entering your password if prompted.
Enter global configuration mode by typing configure terminal.
Enter the following command to set the new IOS image file as the default boot image: boot system flash:c3550-ipservicesk9-mz.122-55.SE8.bin. This will ensure that your switch will always boot from this file unless you change it manually.
Enter exit to return to privileged 061ffe29dd