CLI Reference Guide-R02

Chapter 8 | Authentication Commands
Secure Shell
– 246 –
Configuration Guidelines
The SSH server on this switch supports both password and public key
authentication. If password authentication is specified by the SSH client, then the
password can be authenticated either locally or via a RADIUS or TACACS+ remote
authentication server, as specified by the authentication login command. If public
key authentication is specified by the client, then you must configure
authentication keys on both the client and the switch as described in the following
section. Note that regardless of whether you use public key or password
authentication, you still have to generate authentication keys on the switch and
enable the SSH server.
To use the SSH server, complete these steps:
1. Generate a Host Key Pair – Use the ip ssh crypto host-key generate command to
create a host public/private key pair.
2. Provide Host Public Key to Clients – Many SSH client programs automatically
import the host public key during the initial connection setup with the switch.
Otherwise, you need to manually create a known hosts file on the management
station and place the host public key in it. An entry for a public key in the
known hosts file would appear similar to the following example:
10.1.0.54 1024 35 15684995401867669259333946775054617325313674890836547254
15020245593199868544358361651999923329781766065830956
Table 45: Secure Shell Commands
Command Function Mode
ip ssh
authentication-retries
Specifies the number of retries allowed by a client GC
ip ssh server Enables the SSH server on the switch GC
ip ssh timeout Specifies the authentication timeout for the SSH server GC
copy tftp public-key Copies the user’s public key from a TFTP server to the
switch
PE
delete public-key Deletes the public key for the specified user PE
disconnect Terminates a line connection PE
ip ssh crypto
host-key generate
Generates the host key PE
ip ssh crypto zeroize Clears the host key from RAM PE
ip ssh save host-key Saves the host key from RAM to flash memory PE
show ip ssh Displays the status of the SSH server and the configured
values for authentication timeout and retries
PE
show public-key Shows the public key for the specified user or for the host PE
show ssh Displays the status of current SSH sessions PE
show users Shows SSH users, including privilege level and public key
type
PE