To generate the keys, select the RSA key size among you need to tell the then click on the button to generate the keys for you. Here, you need to enter this tool, crrypto can generate public and private keys.
However a longer modules takes longer to generate see the table below for sample times and takes longer to use. Key Length Keys that reside on a USB token are saved to persistent token storage when they are generated. To generate Rivest, Shamir, and Adelman RSA key pairs, use the crypto key generate rsa commandinglobal configuration mode. If the configuration is not saved to NVRAM, the generated keys are lost on the next reload of the router.
