The pros are that in case the compact flash goes bad, the router can still be booted up with the desired IOS image, without the need to purchase / replace the flash card also, multiple routers on the network can be booted up from a single common IOS image stored on the TFTP server, without the need to store the IOS locally on the flash of each router. Whatever be the reason, booting the router from the TFTP server has its fair share of pros and cons. The TFTP server acts a repository for IOSes and all routers access IOSes from the TFTP server.The flash has gone bad and cannot be used to store the IOS image.The flash has no space to store the Cisco IOS system image and the image has been stored on a local TFTP server.There can be multiple reasons why we may wish to do so: When working with Cisco routers, many-a-times we wish to boot the router from a local TFTP server.
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