C
HAPTER
27
| Authentication Commands
Secure Shell
– 690 –
DEFAULT SETTING
Generates both the DSA and RSA key pairs.
COMMAND MODE
Privileged Exec
COMMAND USAGE
◆ The switch uses only RSA Version 1 for SSHv1.5 clients and DSA
Version 2 for SSHv2 clients.
◆ 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
Console#ip ssh crypto host-key generate dsa
Console#
RELATED COMMANDS
ip ssh crypto zeroize (690)
ip ssh save host-key (691)
ip ssh crypto
zeroize
This command clears the host key from memory (i.e. RAM).
SYNTAX
ip ssh crypto zeroize [dsa | rsa]
dsa – DSA key type.
rsa – RSA key type.
DEFAULT SETTING
Clears both the DSA and RSA key.
COMMAND MODE
Privileged Exec
COMMAND USAGE
◆ This command clears the host key from volatile memory (RAM). Use
the no ip ssh save host-key command to clear the host key from flash
memory.
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