This is the lowest possible value, and this is used to ensure compatibility with older TFTP servers. On Catalyst switches, TFTP is set up by default to use a block size of 512. Most of the time, we will use TFTP to copy a new version of software to a switch.
Here’s the good news: there is a way to make it a little bit less painful. Sitting and staring at the console as a TFTP file transfer occurs for an image of this size is nothing short of painful. For example, version 03.06.01E is about 290 MB. Newer switches, such as the Catalyst 3850, use an extremely large software image because they support so many features. IOS software image size has certainly increased over time. This is made even more apparent when a large quantity of switches needs to be upgraded for a project.
Upgrading software on Cisco Catalyst switches isn't necessarily difficult to do, but it can be a time-consuming process.
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