What is the process of updating a router?
(1) Shut down all interfaces not needed to perform the update (2) Back up the current operating system and the current configuration file to a TFTP server (3) Load the update for either the operating system or the configuration file (4) Test to confirm that the update works properly. If the tests are successful, you can then re-enable the interfaces you disabled. If the tests are not successful, back out the update, determine what went wrong, and start again.
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