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Periodic TFTP requests occur on the network because the router tries to auto load configuration files from a network server


Core Issue

The router can be configured to automatically download the configuration file from a TFTP server by issuing the service config command. Storing the configuration files on a TFTP server and downloading them while booting is useful when the size of the configuration file is larger than the size of the NVRAM on the router.

When the router is configured with this command, it generates TFTP requests to download its configuration from a TFTP server. If it is not able to find a TFTP server, or if a TFTP server is not available, the router will periodically send TFTP requests on the network, along with an error message that starts with %SYS-4-CONFIG_RESOLVE_FAILURE: appearing on the console.

In other instances, users may see an error messages similar to %Error opening tftp:// (Timed out)


To stop the router from attempting to download the configuration file from the TFTP server (and to stop the error message), issue the no service config command in global configuration mode.

For more information on configuring auto loading of configuration files, refer to the Maintaining Configuration Files Larger than NVRAM section of Managing Configuration Files.

Other Errors, Warnings, and Log Messages


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