SSH Commands 379
crypto key generate rsa
The crypto key generate rsa Global Configuration mode command generates RSA key pairs.
Syntax
• crypto key generate rsa
Default Configuration
RSA key pairs do not exist.
Command Mode
Global Configuration mode.
User Guidelines
• RSA keys are generated in pairs: one public RSA key and one private RSA key. If the device already has
RSA keys, a warning and prompt to replace the existing keys with new keys is displayed.
• The maximum supported size for the RSA key is 2048 bits.
• This command is not saved in the startup configuration; however, the keys generated by this command
are saved in the FLASH. The SSH keys can be displayed with the
show crypto key mypubkey rsa
command.
• This command may take a considerable period of time to execute.
Example
The following example generates RSA key pairs.
ip ssh pubkey-auth
The ip ssh pubkey-auth Global Configuration mode command enables public key authentication for
incoming SSH sessions. Use the no form of this command to disable this function.
Syntax
• ip ssh pubkey-auth
• no ip ssh pubkey-auth
Default Configuration
The function is disabled.
Command Mode
Global Configuration mode.
Console (config)# crypto key generate rsa
5400_CLI.book Page 379 Wednesday, December 17, 2008 4:33 PM
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