B-22
Catalyst 3550 Multilayer Switch Software Configuration Guide
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AppendixB Working with the IOS File System, Configuration Files, and Software Images
Working with Software Images
Preparing to Download or Upload an Image File By Using TFTP
Before you begin downloading or uploading an image file by using T FTP, do these tasks:
•Ensure that the workstation acting as the TFTP server is properly configured. On a Sun workstation,
make sure that the /etc/inetd.conf file contains this line:
tftp dgram udp wait root /usr/etc/in.tftpd in.tftpd -p -s /tftpboot
Make sure that the /etc/services file contains this line:
tftp 69/udp
Note You must restart the inetd daemon after modifying the /etc/inetd.conf and /etc/services
files. To restart the daemon, either stop the inetd process and re start it, or ent er a fastboot
command (on the SunOS 4.x) or a reboot command (on Solaris 2.x or SunO S 5. x). For
more information on the TFTP daemon, refer to the documentation for your workst ation.
•Ensure that the switch has a route to the TFTP server. The switch and the TFTP server must be in
the same subnetwork if you do not have a router to route traffic bet ween subnets. Check connectivity
to the TFTP server by using the ping command.
•Ensure that the image to be downloaded is in the correct directory on the TFTP server (usually
/tftpboot on a UNIX workstation).
•For download operations, ensure that the permissions on the file are set correctly. The permission
on the file should be world-read.
•Before uploading the image file, you might need to create an empty file on the TFTP s erver. To
create an empty file, enter the touch filename command, where filename is the name of the file you
will use when uploading the image to the server.
•During upload operations, if you are overwriting an existing file (including an empty fi le, if you had
to create one) on the server, ensure that the permissions on th e f ile ar e s et correctly. Permissions on
the file should be world-write.
Downloading an Image File By Using TFTP
You can download a new image file and replace the current image or keep the current image.
Beginning in privileged EXEC mode, follow Steps 1 through 3 to download a new im age f rom a T FTP
server and overwrite the existing image. To keep the current image, skip Step 3.
Command Purpose
Step1 Copy the image to the appropriate TFTP directory on the
workstation. Make sure the TFTP server is properly configured;
see the “Preparing to Download or Upload an Image File By Using
TFTP” section on page B-22.
Step2 Log into the switch through the console port or a Telnet session.