System Management Commands
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Default Setting
Deletes both the DSA and RSA key.
Command Mode
Privileged Exec
Example
ip ssh crypto host-key generate
Use this command to generate the host key pair (i.e., public and private).
Syntax
ip ssh crypto host-key generate [dsa | rsa]
• dsa – DSA (Version 2) key type.
• rsa – RSA (Version 1) key type.
Default Setting
Generates both the DSA and RSA key pairs.
Command Mode
Privileged Exec
Command Usage
• This command stores the host key pair in memory (i.e., RAM). Use the ip
ssh save host-key command to save the host key pair to flash memory.
• Some SSH client programs automatically add the public key to the known
hosts file as part of the configuration process. Otherwise, you must manually
create a known hosts file and place the host public key in it.
• The SSH server uses this host key to negotiate a session key and encryption
method with the client trying to connect to it.
Example
ip ssh crypto zeroize
Use this command to clear the host key from memory (i.e. RAM).
Syntax
ip ssh crypto zeroize [dsa | rsa]
• dsa – DSA key type.
• rsa – RSA key type.
Console#delete public-key admin dsa
Console#
Console#ip ssh crypto host-key generate dsa
Console#
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