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Configuring Secure Shell (SSH)
Further Information on SSH Client Public-Key Authentication
Replacing or Clearing the Public Key File. The client public-key file
remains in the switch’s flash memory even if you erase the startup-config file,
reset the switch, or reboot the switch.
■ You can remove the existing client public-key file or specific keys by
executing the clear crypto public-key command. This clears the public
keys from both management modules. The module that is not active
must be in standby mode.
Syntax: clear crypto public-key
Deletes the client-public-key file from the switch.
Syntax: clear crypto public-key 3
Deletes the entry with an index of 3 from the
client-public-key file on the switch.
Enabling Client Public-Key Authentication. After you TFTP a client-
public-key file into the switch (described above), you can configure the switch
to allow the following:
■ If an SSH client’s public key matches the switch’s client-public-key
file, allow that client access to the switch. If there is not a public-key
match, then deny access to that client.
Caution To enable client public-key authentication to block SSH clients whose public
keys are not in the client-public-key file copied into the switch, you must
configure the Login Secondary as none. Otherwise, the switch allows such
clients to attempt access using the switch’s Operator password.
Syntax: aaa authentication ssh login public-key none
Allows SSH client access only if the switch detects a match
between the client’s public key and an entry in the client-
public-key file most recently copied into the switch.
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